Answer: The force of gravity
Jupiter and other gas Giants use gravitational force to attract gas to the top, while they still have a solid core,the force in the center keeps the planet together.
I hope this helps & Good Luck <3 !!
The composite wall of an oven consists of three materi-als, two of which are of known thermal conductivity, kA = 20 W/m . K and kc = 50 W/m . K, and known thickness, LA = 0.30 m and LC = 0.15 m. The third material, B, which is sandwiched between materials A and C, is of known thickness, LB = 0.15 m, but unknown thermal conductivity kB. Under steady-state operating conditions, measurements reveal an outer surface temperature of Ts,o = 20degree C, an inner surface temperature of Ts,i = 600degree C, and an oven air temperature of Tinfinity = 800degree C. The inside convection coefficient h is known to be 25 W/m2 . K. What is the value of kB?
The value of KB when KA and KC are given along with their thickness is calculated to be 1.57 W/m.K.
The value of thermal conductivity kA is given as = 20 W/m.
The value of thermal conductivity kC is given as = 50 W/m.
The thickness LA is given as = 0.30 m.
The thickness LB is given as = 0.15 m.
The thickness LC is given as = 0.15 m.
Temperature on the inner surface Ts,0 = 20 degrees
Temperature on the outer surface Ts,i = 600 degrees
Temperature at infinity = 800 degrees
Convection coeffiecient h = 25W/m²
Thermal resistance due to conductivity,
R = L/KA
Thermal resistance due to heat transfer coefficient
R' = L/KA
We know that heat transfer Q
Q = ΔT /Rth
By equating heat,
(600 - 20)/[LA/A KA + LB/B KB + LC/C KC] = (800 - 20)/[LA/A KA + LB/B KB + LC/C KC + 1/Ah]
(600 - 20)/[0.3/20 + 0.15/B KB + 0.15/50] = (800 - 20)/[0.3/20 + 0.15/B KB + 0.15/50 + 1/25]
580/[0.015 + 0.15/ KB + 0.003] = 780/[0.015 + 0.15/ KB +0.003 + 0.04]
580/(0.018 + 0.15/ KB) = 780/(0.058 + 0.15/ KB)
580(0.058 + 0.15/ KB) = 780(0.018 + 0.15/ KB)
33.64 + 87/KB = 14.04 + 117/KB
33.64 - 14.04 = 117/KB - 87/KB
19 = 1/KB (117 - 87)
19 KB = 30
KB = 30/19 = 1.57 W/m.K
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a 6 x 8 metal plate is resting inside a hemispherical bowl, whose radius is 13. the plate is parallel to the rim of the bowl, which is parallel ot the tabletop
The plate is about 12.65 units away from the top of the bowl, with a contact area of 48 square units on the bottom of the bowl.
The plate is parallel to the rim of the bowl, it is not in contact with the curved surface of the bowl. The area of the plate in contact with the bottom of the bowl can be calculated as the product of its dimensions: 6 x 8 = 48 square units.
The distance between the bottom of the bowl and the top of the plate can be calculated using the Pythagorean theorem. The height of the bowl is the radius, which is 13 units. The width of the bowl can be calculated as the diameter, which is twice the radius, or 26 units. The width of the plate is 6 units, so the distance between the bottom of the bowl and the top of the plate can be calculated as,
sqrt(13^2 - 3^2) = sqrt(160) = 12.65 units
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The drivers of two cars having equal speeds hit their brakes at the same time, but car A has four times the acceleration as car B .
Part A
If car A travels a distance D before stopping, how far (in terms of D ) will car B go before stopping?
Express your answer as an integer.
Part B
If car B stops in time T , how long (in terms of T ) will it take for car A to stop?
Express your answer to two significant figures
Car A's time to halt, tA = 0.33T. This is the right response to the question that was asked. The answer has two significant figures.
What is a good illustration of two vehicles with similar speeds but differing velocities?Provide an illustration of two vehicles with similar speeds but differing velocities. Example: Two 40 km/hr automobiles, one heading east and the other north.
If two cars accelerate at the same rate, do they move at the same speed? If not, why not?Equal accelerations do not necessarily imply identical velocities, and vice versa. For instance, even if both of your cars have the same acceleration, if one of them accelerates first, it will certainly go more quickly than the other.
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A solid nonconducting sphere is inside a solid nonconducting spherical shell, as shown in the figure. A total charge +Q is evenly distributed throughout the sphere and is also evenly distributed throughout the shell. Which of the following statements is a correct claim about the electric field at point X between the sphere and shell and has a valid supporting statement?
(A). The electric field points to the left, because the electric field from sphere is zero and the electric field from the shell is directed to the left (B). The electric field points to the left, because a Gaussian sphere concentric with the sphere X on its surface only encloses the charge on the inner sphere. (c). The electric field points to the right, because the electric field from the shell has a larger magnitude that the electric field from the sphere (d). The electric field is zero, because a Gaussian sphere concentric with the sphere with X on its surface encloses zero net charge.
(E). The electric field is zero, because point X is inside a nonconducting shell.
The correct claim about the electric field at point X between the sphere and shell is option (d). The electric field is zero, because a Gaussian sphere concentric with the sphere with X on its surface encloses zero net charge.
According to Gauss's law, the electric field at a point in space is proportional to the net charge enclosed by a Gaussian surface around that point. In this case, a Gaussian sphere concentric with the sphere with point X on its surface will enclose the charges on both the inner sphere and the outer shell. However, since the total charge on both objects is equal and opposite, the net charge enclosed by the Gaussian surface is zero, and therefore, the electric field at point X is zero. The fact that point X is inside a non-conducting shell (as stated in option E) is not relevant to the electric field at that point. Option A is incorrect because the electric field from the shell is directed outward, away from the center, not to the left. Option B is also incorrect because the Gaussian surface will enclose the charges on both the inner sphere and the outer shell, not just the charges on the inner sphere. Option C is incorrect because the magnitudes of the electric fields from the sphere and shell do not determine the direction of the electric field at point X.
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The rate constant of a certain reaction is known to obey the Arrhenius equation, and to have an activation energy E_a = 30.0 kJ/mol. If the rate constant of this reaction is 5.0 times 10^4 M^-1 s^-1 at 201.0 degreeC, what will the rate constant be at 172.0 degreeC? Round your answer to 2 significant digits.
The rate constant be at 172.0°C is 1.11 x10⁵ m⁻¹s⁻¹
We employ the Arrhenius equation, which is: to determine the rate constant for the reaction at two different temperatures.
Ln(k 172.0°C/ k 201°C) = Ea/R (1/T₁ - 1/T₂)
where,
k 201°C = equilibrium constant at 201°C = 5x 10⁴m⁻¹s⁻¹
k 172.0°C = equilibrium constant at 172.0°C = ?
Ea = Activation energy = 30.0 kJ/mol = 30000 J/mol (Conversion factor: 1 kJ = 1000 J)
R = Gas constant = 8.314 J/mol K
T₁ = initial temperature = 201°C = 474°K
T₂ = final temperature = 172.0°C = 445 °K
Putting the value
Ln(k 172.0°C/ k 201°C) = 30000 J/mol /8.314 J/mol K (1/ 474°K - 1/445 °K)
k 172.0°C = 1.11 x10⁵ m⁻¹s⁻¹
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organisms are able to maintain their normal internal temperatures because their bodies contain water, which protects them from rapid temperature changes. it is water's heat
Water's high specific heat capacity helps it resist changes in temperature, making it a useful tool for organisms to regulate their body temperature.
How does water regulate the body temperature?
Water helps regulate body temperature through several mechanisms.
Cooling through sweating: When the body becomes too warm, water in the form of sweat is secreted through the sweat glands onto the surface of the skin. As the sweat evaporates, it takes heat away from the body, cooling it down.Retaining heat through shivering: When the body becomes too cold, water in the form of blood is circulated to muscles, which can contract rapidly and generate heat through shivering.Distributing heat through blood flow: Water in the form of blood is circulated throughout the body, carrying heat away from warmer areas and distributing it to cooler areas. This helps maintain a consistent internal temperature.In addition, water's high specific heat capacity allows it to resist changes in temperature, which helps the body maintain a constant internal temperature even in the face of external temperature fluctuations.
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Which of the following changes would increase the strength of the magnetic field?
A. adding a light bulb to the circuit
B. removing the core
C. decreasing the current
D. increasing the number of coils
The strength of the magnetic field will be increased by increasing the number of coils. The correct option is D.
What is a magnetic field?A magnetic field is a vector field that describes the magnetic influence on moving charges, currents, and magnetic materials. A moving charge in a magnetic field is subjected to a force that is perpendicular to both its own velocity and the magnetic field.
An electromagnet is a type of magnet in which the magnetic field is produced by an electric current. Electromagnets usually consist of wire wound into a coil.
By increasing the number of coils there will be more current around the space resulting in a more magnetic field. In this way the strength of the magnetic field is increased.
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True or False: The longer a pendulum is, the longer it takes to swing. Therefore, when the pendulum of a clock is lengthened, the clock slows down.
Yes, it is true, the longer a pendulum is, the longer it takes to swing. Therefore, when the pendulum of a clock is lengthened, the clock slows down.
The length of a pendulum influences the time it takes to complete one swing, which is referred to as the period. The pendulum swings more slowly and has a longer period as it gets longer. A clock slows down when the pendulum is stretched because it takes longer for each swing to be completed. Similar to how the clock speeds up when the pendulum is shorter, it swings quicker as well. The operation of pendulum clocks and other timekeeping instruments that employ pendulums to measure time is based on this idea.
A pendulum's period, or how long it takes to complete one full swing back and forth, can be used to define how it moves. The length, gravitational acceleration, and angle of displacement are some of the variables that affect a pendulum's period. However, the length of a particular pendulum is what essentially determines its period.
The period of a basic pendulum is described mathematically as
T = 2(L/g), where T is the period, L is the length of the pendulum, and g is the gravitational acceleration.
As you can see, the square root of the length and the period are precisely proportional. This implies that the period likewise grows as the pendulum's length does.
The pendulum offers a means of controlling the clock's timekeeping mechanism. The clock's hands are moved by a gear train that is moved back and forth by the pendulum. The pendulum's length can be changed by the clockmaker to alter the clock's rate of movement. The pendulum can be shortened to make it swing more quickly and speed up the clock if it is running quickly. The pendulum can be stretched to make it swing more slowly and slow down the clock if it is operating slowly.
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A box with a of mass 3.0 kg slides down a rough vertical wall. The gravitational force on the box is 29.4 N. When the box reaches a speed of 2.5 m/s, you start pushing on one edge of the box at a 45∘ angle with a constant force of magnitude Fp= 23.0 N. There is now a frictional force between the box and the wall of magnitude 13.0 .
Assuming that the angle at which you push on the edge of the box is again 45 ∘, with what magnitude of force Fp should you push if the box were to slide down the wall at a constant velocity? Note that, in general, the magnitude of the friction force will change if you change the magnitude of the pushing force. Thus, for this part, assume that the magnitude of the friction force is f=0.516Fp
2.8s after you have started pushing the velocity is 2.6m/s (I don't know if this helps but it is what I had to find in the part right before this question)
The maximum height achieved by the body is h = v√(1/2g).
Who is the formula to find the potential energy near earth's surface?The formula to find the potential energy near earth's surface is -
U = mgh
Given is to identify the maximum height to which the object will rise.
Using the energy conservation, we can write -
1/2mv² = mgh
1/2v² = gh
h = v√(1/2g)
Therefore, the maximum height achieved by the body is h = v√(1/2g).
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For each of the regions, use the midpoint method to identify whether the supply of this good is elastic or inelastic.Region Elastic or InelasticBetween Y and Z Between W and X
(a). Elasticity of supply between W and X is elastic.
(a)-1.The supply elasticity relationship Y and Z becomes inelastic.
b. The assertion is accurate.
What kind of products are elastic?Like a dishwasher or a car, these are infrequently acquired things that can be put off if the price increases. Elasticity is a crucial economic metric because it shows how much of an item or service consumers consumes when the price varies, which is especially essential for businesses that sell goods or services. That whenever a commodity is elastic, a price fluctuation prompts a shift in demand for it rapidly.
What three forms of elasticity are there?Economists use elasticity to determine how different factors interact. Pricing, cross-price quantity demanded, and quantity demanded are the three main types of elasticity. Goods' elasticity gauges how sensitive they are to price changes.
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A block of mass M on an inclined surface is attached to a spring of negligible mass, as shown. The other end of the spring is attached to a wall, and there is negligible friction between the block and the incline. The block is pulled to a position such that the spring is stretched from its equilibrium position. The block is then released from rest. Which of the following systems can be classified as a closed system? (A). A system consisting of the block only (B). A system consisting of the spring and Earth A syster (C). A system consisting of the block and spring (D). A system consisting of the block, spring, and Earth
The correct system that can be classified as a closed system in this scenario is (C). A system consisting of the block and spring.
A closed system is one that does not exchange matter or energy with its surroundings. In this scenario, the block and the spring are the only objects that interact with each other, and there is no energy or matter exchange with the surroundings. Therefore, the system consisting of the block and spring can be considered as a closed system. Options A and B are incorrect because they do not include the spring or the block, respectively, both of which are essential components of the system. Option D is incorrect because it includes the Earth, which is not part of the system and can exchange matter and energy with the block and spring.
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the sun is not located at the center of an elliptical orbit, but is offset somewhat toward one of its ends.T/F
The sun is not located at the center of an elliptical orbit, but is offset somewhat toward one of its ends - True.
The Sun is not relatively at the center of a earth's elliptical route. An cirque has a point a little bit down from the center called the" focus". The Sun is at the focus of the cirque. Because the Sun is at the focus, not the center, of the cirque, the earth moves near to and further down from the Sun every route. The close point in each route is called perihelion. The far down point is called aphelion.
The Sun isn't located at the center of an elliptical route, but is neutralize kindly toward one of its ends. The Greek champion Claudius Ptolemaeus ( Ptolemy) tutored that all heavenly bodies moved in perfect indirect routeways centered on the Earth.
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Continuing the preparation of the proposal for the Eau Gaullie treatment plant (Problem 6-38), design the flocculation tank by providing the follow- ing for the first two compartments only: 1. Water power input in kW 2. Tank dimensions in m 3. Diameter of the impeller in m 4. Rotational speed of impeller in rpm Use the following assumptions: 1. Number of tanks = two 2. Tapered G in three compartments: 90, 60, and 30 s 3. GO= 120,000 4. Compartment length = width = depth 5. Impeller type: axial-flow impeller, three blades, Np = 0.31 6. Available impeller diameters: 1.0, 1.5, and 2.0 m 1 7. Assume B = 1/3 H Answers for first compartment only: P = 295.31, or 295 W or 0.295 kW L=W=D = 3.3 m Impeller diameter = 1.5 m Rotational speed = 30 rpm
Eau Gaullie treatment a) expected flow rate is 1852 gpm. b) Tank diameter is 41.7 ft. c) input power is 21.1 hP
From flow in tank coefficient equation C_Q = Q/(W×D³)
Q ∝ d³
Qd₁/Qd₂ = d₁³/d₂³
where Eau Gaullie treatment Qd₁ and Qd₂ are different discharges with respect to different diameter, (Qd₁ = 3200 gpm) and d₁ is diameter one ( 12 in) while d₂ is diameter 2 ( 10 in),
now we substitute
Qd₂ = Qd₁(d₂³/d₁³)
Qd₂ = 3200( 10/12)³
Qd₂ = 1852 gpm
∴ expected flow rate is 1852 gpm
next we calculate the head
h ∝ d²
hd₁/hd₂ = d₁²/d₂²
where hd₁ and hd₂ are different heads with respect to different diameter, (hd₁ = 60 ft) and d₁ is diameter one ( 12 in) while d₂ is diameter 2 ( 10 in),
now we substitute
hd₂ = hd₁(d₂²/d₁²)
hd₂ = 60 ( 10/12 )²
hd₂ = 41.7 ft
∴ head is 41.7 ft
Now calculate the input power
W ∝ d⁵
Wd₁/Wd₂ = d₁⁵/d₂⁵
where Wd₁ and Wd₂ are different power with respect to different diameter, (Wd₁ = 60 hp) and d₁ is diameter one ( 12 in) while d₂ is diameter 2 ( 10 in),
now we substitute
Wd₂ = Wd₁(d₂⁵/d₁⁵)
Wd₂ = 60 ( 10/12 )⁵
Wd₂ = 21.1 hP
∴ input power is 21.1 hP
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A scale of 1:900,000 is _____________ a scale of 1:24,000:
A - equal to
B - smaller than
C - twice as much as
D - larger than
The stated statement indicates that Scales less than 1:24,000 are 1:900,000 and 1:24,000, respectively.
The correct option is B.
In what sense is a scale defined?a graded object, particularly when used as a rule or measure: a set of markings or points spaced apart at defined intervals used to measure distances, such as: a relationship between the distances shown on a map and their corresponding actual distances (such as the height of the mercury in a thermometer)
What other names do scales go by?To visually depict the scale of a map, maritime chart, engineering design, or architectural drawing, use a linear scale, also known as a bar scale, scale bar, or graphic scale.
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A student a model of isostatsy by placing a block of soon in a beaker
To answer the question: "A student made a model of isostasy by placing a block of wood in a beaker of water how can a student demonstrate isostaic rebound using her model?" If she "Press the block down and let go
What is Isostasy?The state of gravitational equilibrium between the Earth's crust and mantle known as isostasy or isostatic equilibrium causes the crust to "float" at an elevation that is dependent on its thickness and density.
This idea is used to explain how various topographic heights can occur on the surface of the Earth.
Hence, to test the model she has, she should press the block down and let go
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A student made a model of isostasy by placing a block of wood in a beaker of water how can a student demonstarte isostaic rebound using her model
A. Blow vigorously on the block
B. Press the block down and let go
C. Add water until the beaker overflow
D. Pour out all the water
A 5-kg block is suspended by a rope from the ceiling of an elevator that accelerates downward at 3.0 m/s2 . The tension force of the rope on the block is: (specify magnitude and direction)
The tension force is 15 N.
What is the tension force?Tension force is a pulling force transmitted through a flexible medium, such as a rope or cable, when it is pulled at both ends. It is directed along the length of the medium and is equal in magnitude at both ends.
In this case we have been told that A 5-kg block is suspended by a rope from the ceiling of an elevator that accelerates downward at 3.0 m/s2 .
We know that the tension force is the force that acts along the rope hence;
Tension = ma
= 5 Kg * 3.0 m/s2
= 15 N
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Sally was removing her nail polish to get ready for a dance. She was also drinking a bottle of water. The doorbell rang and she rushed to answer it, leaving the open bottle of nail polish remover (acetone) and the bottle of water open. Sally forgot about them until the next morning and when she checked, the nail polish remover (acetone) was empty and the water looked untouched.
Sally believes the particles in water stick together more. In terms of your knowledge of the strength of electrical forces and the structure of substances, explain Sally's statement.
Sally's observation that the water bottle appeared untouched while the acetone bottle was empty can be explained by the stronger cohesive forces between the water molecules compared to the acetone molecules. The water molecules stick together more tightly, preventing them from evaporating as quickly as the acetone molecules
Explaining Sally's statementSally's statement that particles in water stick together more is partially correct. The cohesive forces between the particles in water, also known as hydrogen bonds, are indeed stronger than the intermolecular forces between the particles in acetone, which are dipole-dipole interactions.
The strength of the intermolecular forces between particles is determined by the type of chemical bonding and the molecular structure of the substance. In the case of water, the oxygen atom in each molecule attracts electrons more strongly than the two hydrogen atoms, giving rise to partial negative charges around the oxygen and partial positive charges around the hydrogen. This creates an electrostatic attraction between neighboring water molecules, resulting in hydrogen bonding.
On the other hand, acetone molecules have a polar covalent bond between the carbon and oxygen atoms, resulting in partial positive and negative charges. The intermolecular forces between acetone molecules are weaker than those between water molecules, because the dipole moments in acetone are not as large as the dipole moments in water.
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A box initially has 335 J of kinetic energy. After 2.30 s, the final kinetic energy is 125. Calculate the power.
Answer:
Explanation:
The work-energy theorem states that the net work done by the forces on an object equals the change in its kinetic energy.
Work done = 335-125=110
Power=work done/time = 110/2.3 = 47.83 watts
For a mammal, the average time it takes for blood to circulation the body and return to the heart is given by the function C(m)=18m0.23 C ( m ) = 18 m 0.23 , where C C is the circulation time in seconds and m m is the mass of the mammal in kilograms. Find the circulation time for a mammal that weighs 90 kilograms. Then find a formula for C′(m) C ′ ( m ) and evaluate C′(90) C ′ ( 90 ) .
the rate of change in is C'(m)=
C'(90)
C is the duration of the heartbeat in seconds, whereas m is the kilos of the animal. The decrease in is C'(90) occurs at a rate of 0.13 sec kg1.
How would you define mass?A known quantity of inertia, an essential characteristic of all matter, is known as mass in physics. The resistance a body of substance offers to either a modification in its movement or location as a result of the force that is applied is what it is in essence.
Why does matter have mass?The amount of substance in a thing is measured by its mass. Its mass will remain constant regardless of where it is situated in the vast universe. The amount of gravitational force acting on an object is measured by its heaviness, on the other hand.
C(m) = 18 m0.23 sec
C(m = 90 kg) = 18 (90)0.23 sec
= 50.67 sec
C (m) = 18m0.23
C' m = dc/dm
= 18 (0.23) m0.23⁻¹
= 4.14 m⁻⁰·77
C' (90kg) = 0.13 sec kg⁻¹
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a car comes to a bridge during a storm and finds the bridge washed out. the driver must get to the other side, so he decides to try leaping it with his car. the side the car is on is 18.1 m above the river, whereas the opposite side is a mere 2.0 m above the river. the river itself is a raging torrent 68.0 m wide. for help with math skills, you may want to review: vector magnitudes for general problem-solving tips and strategies for this topic, you may want to view a video tutor solution of different initial and final heights.
Equation to solve for v:v = sqrt(u² + 2as)Substituting the given values, we get:v = sqrt((25.7 m/s)² + 2(-9.8 m/s²)(16.1 m))v = 14.9 m/s
What is speed?It is a scalar quantity that represents the speed at which an item moves or changes position with respect to time.
A) To determine the initial velocity required to clear the river and land safely on the other side, we need to use the following equation d = vt + (1/2)at²
Where d is the distance the car needs to travel horizontally, which is the width of the river (68 m).v is the initial velocity of the car. An is the acceleration due to gravity (-9.8 m/s²).
T is the time the car spends in the air. We can rearrange this equation to solve for v:v = (d – (1/2)at²) / substituting the given values, we get:v = (68 m – (1/2)(-9.8 m/s²)(18.1 m)²) / (2(18.1 m)/v)v = 25.7 m/s
B) To determine the speed of the car just before it lands on the other side, we can use the following equation: where:u is the initial velocity of the car. An is the acceleration due to gravity (-9.8 m/s²).s [tex]v^² = u^² + 2as[/tex]is the vertical distance the car travels from the cliff to the other side (18.1 m – 2 m = 16.1 m).
Therefore, (A) To clear the river and safely land on the other side, the car must be moving at a speed of 25.7 m/s (or approximately 92.5 km/h) immediately as it exits the cliff.
(B) The car is travelling at a speed of 14.9 m/s, or approximately 53.6 km/h, shortly before it safely falls on the opposite side.
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A car comes to a bridge during a storm and finds the bridge washed out. The driver must get to the other side, so he decides to try leaping it with his car. The side the car is on is 18.1 m above the river, whereas the opposite side is a mere 2 m above the river. The river itself is a raging torrent 68 m wide.A) How fast should the car be travelling just as it leaves the cliff in order to just clear the river and land safely on the opposite side? B) What is the speed of the car just before it lands safely on the other side?
The position of a particle moving in the x-y plane at any time t is given by : x=(3t^3−6t) metres; y=(t^2−2t) metres. Select the correct statement.
a. acceleration is zero at t=0
b. Valocity is zero at t=0
c. Valocity is zero at t=ts
d. Valocity and acceleration of the particle are never zero
The required velocity and acceleration of this particle when position of the particle is given are never zero. Correct option is D.
The position of the particle is given as x = 3t³ - 6t, y = t² - 2t
The particle's velocity is determined by,
v = dx/dt i + dy/dt j = (9t² - 6) i + (2t - 2) j
The velocity at the point t = 0 is,
v = (9t² - 6) i + (2t - 2) j = - 6 i - 2 j
The velocity at the point t = 1 is,
v = (9t² - 6) i + (2t - 2) j = 3 i
The acceleration of the particle is,
a = d²x/dt² i + d²y/dt² j = 18t i + 2 j
The particle's acceleration at time zero is,
a = 2 j
Thus, the velocity and acceleration of this particle are never zero.
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Which statement best explains why accelerating a car from 20 mph to 40 mph quadruples its kinetic energy? Hint: look at the equation for KE.
Because kinetic energy is directly proportional to the square of the velocity.
Why does the quadruples its kinetic energy?The increase in kinetic energy of an object is proportional to the square of its velocity.
This relationship is described by the equation;
KE = ¹/₂mv²
where;
KE is the kinetic energy, m is the mass of the object, and v is its velocity.When an object accelerates from 20 mph to 40 mph, its velocity increases by a factor of 2. Squaring this factor of 2 results in an increase in kinetic energy by a factor of 4 (2² = 4).
Therefore, the kinetic energy of the object is quadrupled as it increases its velocity from 20 mph to 40 mph.
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The complete question is below:
Which statement best explains why accelerating a car from 20 mph to 40 mph quadruples its kinetic energy? Hint: look at the equation for KE.
A. Because kinetic energy is directly proportional to the cube of the velocity.
B. Because kinetic energy is directly proportional to the square of the velocity.
The statement best explains why accelerating a car from 20 mph to 40 mph quadruples its kinetic energy is:
Kinetic energy is directly proportional to the square of the velocity.
The correct option is A.
What is kinetic energy?The energy that an object has as a result of motion is known as kinetic energy. It is described as the effort required to move a mass-determined body from rest to the indicated velocity. The body holds onto the kinetic energy it acquired during its acceleration until its speed changes.
Mathematically:
Kinetic energy = ¹/₂ mass * velocity²
Hence, when the velocity of a body is doubled, the kinetic energy of the body quadruples.
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Complete question:
Which statement best explains why accelerating a car from 20 mph to 40 mph quadruples its kinetic energy? Hint: look at the equation for KE.
Kinetic energy is directly proportional to the square of the velocity.
Kinetic energy is inversely proportional to the square of the velocity.
Kinetic energy is directly proportional to the fourth power of the velocity. Kinetic energy is inversely proportional to the fourth power of the velocity.
Sound is emitted by a point source. You wish to compare the sound intensity and sound intensity level from this source at two different sites. If the distance to the second site is a factor of 8 greater than the distance to the first, determine the following.
(a) Determine the multiplicative factor by which the sound intensity decreases as you go from the first to the second site. (Assume the intensities at the first and second sites are I1 and I2, respectively.)
I1
I2
= The answer to this one is 64.
(b) Determine the additive amount by which the sound level intensity decreases as you go from the first to the second site. (Assume the sound level intensities at the first and second sites are ?1 and ?2, respectively.) How is sound intensity level related to sound intensity? Recall that
log10(ab) = log10(a) + log10(b).
?1 ? ?2 = dB
a) The multiplicative factor by which the sound intensity decreases as you go from the first to the second site is 64.
b) The additive amount by which the sound level intensity decreases as you go from the first to the second site is -15.56 dB.
a) The intensity of the sound is measured in decibels and the sound intensity level with the intensity I is calculated by the expression,
β(dB) = 10 log(I/I₀)
where,
β/dB is the intensity level
I is sound intensity
The intensity is given by the relation,
Intensity = Power/Area
I = (P/πr²)
Intensity is inversely related to the square of radius.
I₁/I₂ = (r₂/r₁)² = (8/1)² = 64
I₁ = 64 I₂
So, the multiplicative factor is 64.
b) The formula for the intensity level is given by,
β(dB) = 10 log(I/I₀)
β₁ = 10 dB log(I₁/I₀)
β₂ = 10 dB log(I₂/I₀)
β₂ - β₁ = 10 dB[log(I₂/I₀) - log(I₁/I₀)]
β₂ - β₁ = 10 dB log(I₂/I₁)
β₂ - β₁ = 10 dB log(1/36) = -15.56 dB
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A pan is used to boil water by placing it on a stove, from which heat is transferred at a fixed rate q0. There are two stages to the process. In Stage I, the water is taken from its initial (room) temperature Ti to the boiling point, as heat is transferred from the pan by natural convection. During this stage, a constant value of the convection coefficient h may be assumed, while the bulk temperature of the water increases with time, T infinity = T infinity(t). In Stage 2, the water has come to a boil, and its temperature remains at a fixed value, T infinity = Tb, as heating continues. Consider a pan bottom of thickness L and diameter D, with a coordinate system corresponding to x = 0 and x = L for the surfaces in contact with the stove and water, respectively. Write the form of the heat equation and the boundary/ initial conditions that determine the variation of temperature with position and time, T(x, t), in the pan bottom during Stage 1. Express your result in terms of the parameters qo, D, L, h, and T infinity, as well as appropriate properties of the pan material.
During Stage 1, the heat equation that governs the temperature distribution T(x, t) in the pan bottom is given by:
ρc_p∂T/∂t = k∂^2T/∂x^2 + q_0/V
How to use heat equation ?where ρ is the density of the pan material, c_p is the specific heat capacity of the pan material, k is the thermal conductivity of the pan material, and V is the volume of the pan bottom.The first term on the right-hand side of the equation represents heat conduction within the pan material, while the second term represents heat transfer from the pan to the water by natural convection. The term q_0/V represents the heat input rate from the stove.The boundary conditions are:
At x = 0 (the surface in contact with the stove), the temperature is fixed at Ti, and there is no heat flux:
T(x=0,t) = Ti, ∂T/∂x = 0
At x = L (the surface in contact with the water), the heat flux is given by:
-k(∂T/∂x) = h(Tb - T)
where h is the convection coefficient, Tb is the boiling point of water, and T is the bulk temperature of the water, which varies with time.The initial condition is:
T(x, t=0) = Ti
The solution to this heat equation with the above boundary and initial conditions will give the variation of temperature with position and time, T(x, t), in the pan bottom during Stage 1.Note that the properties of the pan material, including ρ, c_p, and k, need to be specified in order to solve the heat equation.
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A velocity vector 39∘ above the positive x -axis has a y -component of 10m/s .What is the value of its x -component?
The y component of the velocity vector is 10 m/s. Then the v is 12.86 m/s. Now the x component of this velocity is v sin θ.That is , x component is 8 m/s.
What is velocity ?Velocity of an object is the measure of its distance travelled per unit time. Velocity is a vector quantity thus having both magnitude and acceleration. The magnitude is called speed.
For a velocity vector there are three translation components possible for three different axes.
here, x component = v sinθ
y component = v cos θ
Given that v cos θ = 10 m/s
θ = 39
Vy = v cos 39 = 10 m/s
then v = 12.8 m/s
Now, the x component is calculated as:
vx = 12.8 m/s sin 39 = 8 m/s.
Therefore, the x component of velocity here is 8 m/s.
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a marathon runner starts her race at a speed of 3 m/s. by the end of the race, 5 hours later, her speed is 2.8 m/s. what was her average acceleration?
Answer: Acceleration, a= -1.11*10^-5
Explanation:
Using a= (V(final speed)- U(Initial speed) )/ TIME IN SECONDS
5hr to seconds is 5*60*60=18,000s
(2.8m/s-3m/s)/ 18,000s = -1.11*10^-5
I'm sorry I wasn't able to explain well, but I hope this helps.
A cord is used to vertically lower an initially stationary block of mass M kg at a constant downward acceleration of g/4. The block has fallen a distance d. (Use any variable or symbol stated above as necessary.)
(a) Find the work done by the cord's force on the block.
WF = __________
(b) Find the work done by the weight of the block.
Wg = ___________
(c) Find the kinetic energy of the block.
K = _________
(d) Find the speed of the block.
v = __________
(a) Work done by the cord's force on the block [tex](WF) = Mg/4\times d[/tex]
(b) Work done by the weight of the block [tex](Wg) = Mg/4 \times d[/tex]
(c) Kinetic energy of the block [tex](K) = Mg/2\times d[/tex]
(d) Speed of the block [tex](v) = sqrt(gd/2)[/tex] where g is the acceleration due to gravity and d is the distance the block has fallen.
What is Kinetic energy?Kinetic energy is the energy that an object possesses due to its motion. In other words, if an object is moving, it has kinetic energy. The amount of kinetic energy an object has depends on its mass and velocity. The formula for calculating kinetic energy, K, is:
K = 1/2 mv^2
where m is the mass of the object and v is its velocity. The factor of 1/2 in the formula is due to the work-energy principle, which states that the work done on an object is equal to the change in its kinetic energy. If a force is applied to an object to put it in motion, work is done on the object, and its kinetic energy increases.
The units of kinetic energy are joules (J). One joule is defined as the amount of work done when a force of one newton (N) is applied over a distance of one meter (m). Since work and energy are measured in the same units, the unit of kinetic energy is the same as the unit of work, which is the joule.
Kinetic energy is a scalar quantity, which means it has magnitude but no direction. The kinetic energy of an object increases as its mass and velocity increase.
(a) The work done by the cord's force on the block can be found using the formula:
[tex]WF = force\times distance[/tex]
The force applied by the cord is equal to the tension in the cord, which is equal in magnitude to the weight of the block. Therefore, the force applied by the cord is:
[tex]F = Mg[/tex]
where M is the mass of the block, and g is the acceleration due to gravity.
The distance over which the force is applied is d, the distance the block has fallen. Therefore, the work done by the cord's force on the block is:
[tex]WF = Fd = Mg \times d[/tex]
Substituting g/4 for g
[tex]WF = M(g/4) \times d = Mg/4 \times d[/tex]
Hence, the work done by the cord's force on the block is Mg/4 × d.
(b) The work done by the weight of the block can be found using the formula:
[tex]Wg = force \times distance[/tex]
The weight of the block is equal to its mass times the acceleration due to gravity, which is:
[tex]W = Mg[/tex]
The distance over which the weight is applied is again d. Therefore, the work done by the weight of the block is:
[tex]Wg = Wd = Mg\times d[/tex]
Substituting g/4 for g:
[tex]Wg = M(g/4) \times d = Mg/4 \times d[/tex]
Hence, the work done by the weight of the block is also [tex]Mg/4 \times d.[/tex]
(c) The change in the kinetic energy of the block can be found using the work-energy principle:
Wnet = ΔK
where Wnet is the net work done on the block, and ΔK is the change in the kinetic energy of the block.
The net work done on the block is equal to the sum of the work done by the cord's force and the work done by the weight of the block:
[tex]Wnet = WF + Wg = Mg/4 \times d + Mg/4 \times d = Mg/2 \times d[/tex]
The change in the kinetic energy of the block is equal to the net work done on the block:
ΔK = Mg/2 × d
Since the block starts from rest, its initial kinetic energy is zero. Therefore, the final kinetic energy of the block is equal to the change in kinetic energy:
[tex]K = Mg/2\times d[/tex]
(d) The final speed of the block can be found using the equation for the final kinetic energy:
[tex]K = 1/2 mv^2[/tex]
where m is the mass of the block, and v is its final speed.
Substituting Mg/2 × d for K and M for m
[tex]Mg/2\times d = 1/2 Mv^2[/tex]
Simplifying and solving for v, we get:
[tex]v = sqrt(gd/2)[/tex]
Therefore, the speed of the block is[tex]sqrt(gd/2)[/tex], where g is the acceleration due to gravity and d is the distance the block has fallen.
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4) A ball is thrown with an initial velocity of 25.2 m/s at 52.0° above the horizontal from the
top of a cliff 95.0 m high. Find: (a) the time of flight; (b) the maximum height; (c) the
horizontal range; (d) the velocity on hitting the ground
a) The time of flight is 4.04 seconds.
b) The maximum height is 115 meters
c) The horizontal range is 63.3 meters.
d) velocity of hitting the ground is 35.35 m / s.
What is a projectile motion?Projectile motion is a type of motion experienced by an object or particle that is launched in a gravitational field, such as from the Earth's surface, and moves along a curved path solely under the influence of gravity.
Given that a ball is thrown with an initial velocity of 25.2 m/s at 52.0° above the horizontal from the top of a cliff 95.0 m high.
a) The time of flight is calculated as:-
t = ( 2usinθ) / g
t = ( 2 x 25.2 x sin52 ) / 9.81
t = 4.04 sec
b) The maximum height is calculated as:-
hm = h + ( usinθ)²/ 2g
hm = 95 + ( 25.2 x sin52)² / ( 2 x 9.81 )
hm = 95 + 20
hm = 115 meters
c) The horizontal range will be,
d = u²sin2θ / g
d = ( 25.2² x sin( 52 x 2 ) / 9.81
d = 63.3 meters
d) The velocity of hitting the ground is calculated as:-
mgh + (1/2 ) mu² = 1/2 mv²
(9.81 x 95 ) + 1/2(25.2)² = v²
v = 35.35 m / s
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fill in the blank. A 1.5-m-long aluminum rod must not stretch more than 1 mm and the normal stress must not exceed 40 MPa when the rod is subjected to a 4,5-kN axial load. Knowing that E= 70 GPa, determine the required diameter of the rod. The required diameter of the rod is ___ mm
A 1.5-m-long aluminum rod must not stretch more than 1 mm and the normal stress must not exceed 40 MPa when the rod is subjected to a 4,5-kN axial load. Knowing that E= 70 GPa, determine the required diameter of the rod. The required diameter of the rod is 377 mm
To determine the required diameter of the aluminum rod, we can use the equation for normal stress in a prismatic bar under axial load:
σ = F / A
where σ is the normal stress, F is the axial load, and A is the cross-sectional area of the rod.
To ensure that the normal stress does not exceed 40 MPa, we can set the equation equal to 40 MPa and solve for the required cross-sectional area:
40 MPa = 4,500 N / A
Solving for A, we get:
A = 4,500 N / (40 MPa) = 0.1125 m^2
To ensure that the rod does not stretch more than 1 mm, we can use the equation for axial strain in a prismatic bar under axial load:
ε = ΔL / L
where ε is the axial strain, ΔL is the change in length, and L is the original length of the rod.
We can rearrange this equation to solve for the required change in length:
ΔL = ε * L = (1 mm) * (1.5 m)
= 0.0015 m
Using the equation for axial strain, we can also express the change in length in terms of the normal stress and the material's elastic modulus:
ε = σ / E
ΔL = ε * L = (σ / E) * L
Solving for the required cross-sectional area using this equation, we get:
A = (F * L) / (E * ΔL) = (4,500 N * 1.5 m) / (70 GPa * 0.0015 m) = 0.0893 m^2
Now that we have two equations for the required cross-sectional area, we can set them equal to each other and solve for the diameter:
A = π * d^2 / 4
d = sqrt(4A / π) = sqrt(4 * 0.1125 m^2 / π) = 0.377 m = 377 mm
Therefore, the required diameter of the aluminum rod is 377 mm.
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Question
What is the angular speed of the second hand of a clock? If the second hand is 10cm long, then find the linear speed of its tip. (in rad/s and m/s)
A
0.1047,0.01047
B
1047,0.01047
C
0.1047,1047
D
0.0047,0.01047
Easy
The correct answer of the angular speed and linear speed respectively is option A) 0.1047,0.01047
To find the angular speed of the second hand of a clock, we use the formula:
Angular speed = 2π / time
Since the second hand of a clock completes one full rotation every 60 seconds, the time is 60 seconds. Therefore:
Angular speed = 2π / 60
Angular speed = 0.1047 rad/s
To find the linear speed of the tip of the second hand, we use the formula:
Linear speed = angular speed x radius (v = ωr)
Since the radius of the second hand is 10cm or 0.1m, we can plug in the values:
Linear speed = 0.1047 x 0.1
Linear speed = 0.01047 m/s
Therefore, the angular speed of the second hand of a clock is 0.1047 rad/s and the linear speed of its tip is 0.01047 m/s.
The correct answer to the angular speed and linear speed is therefore option A) 0.1047, 0.01047.
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