The distance that is covered is 8.5 m.
What is the maximum distance?We have to note that the movement of the dart would be the movement of a parabola. We would need to know that in this case, the first thing that we should find is the time that has been taken;
t = u sin 45/0.5 * 9.8
t = 9.12 sin 45/0.5 * 9.8
t = 1.32 s
Then we have that;
R = Vxt
Thus the distance that is covered is;
R = 9.12 cos45 * 1.32
R = 8.5 m
We can see that the projectile movement of the dart would cover a horizontal distance of about 8.5 m
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A positive point charge Q is located at x=a and a negative point charge −Q is at x=−a. A positive charge q can be placed anywhere on the y-axis.
1) Find an expression for (Fnet)x, the x-component of the net force on q. (Give your answer in terms of Q, q, a, y and constant K.)
The expression for (F net)x when the position of Q and -Q are given, is calculated to be Fx = 2k Qqa/[(a² + y²)]^3/2 x^.
Coulomb's law establishes that the electric force exerted by a point charge q₁ on q₂ is proportional to the values of the charges and inversely proportional to the square of the distance between them. Coulomb obtained this dependence experimentally and introduced a proportionality constant in its law, k = 9 × 10⁹ N m²/c² is coulomb's constant.
Mathematically, Coulomb's law is,
F = k q₁ q₂/r² r^
Let us denote the position of the charge q on the y-axis as 'y'.
The force between 'Q' and'q' is
F₁ = k Qq/(x² + y²)
F₁x = F₁ cosθ
where,
θ is the angle between F₁ and x-axis
F₁x = [k Qq/(x² + y²)] [x/√(x² + y²)]
when x = a, F₁x = k Qqa/[(a² + y²)]^3/2
F₂x = k × -Qq/(a² + y²) × [-a/√(a² + y²)]
Thus, the x-component of the net force,
Fx = 2k Qqa/[(a² + y²)]^3/2 x^
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The acceleration of an object that has a mass of 0.025 kg and exhibits simple harmonic motion is given by the following equation.????x(????)=(10 m/s2)cos(????????+3????/2)Calculate the object's velocity ????x(????) at time ????=2.0 s, assuming that the velocity of the object is ????x=−3.2 m/s at ????=0 s.
The velocity of the object is (2.0 s) = 0+∫ = −3.2 m/s − 5 m/s = −8.2 m/s
What is velocity?Velocity is a vector quantity that measures the rate of change of an object's position. It is the speed of an object in a given direction and is usually represented by a vector with both magnitude (the speed) and direction. Velocity is the rate at which an object's position changes over time, or the derivative of an object's position with respect to time.
The velocity of the object at time t = 2.0 s can be calculated using the equation for velocity, =0+∫.
We can calculate the velocity at t = 2.0 s by first calculating the integral of the acceleration equation.
∫ = −(10/)sin(+3/2)
Substituting in t = 2.0 s, we get
∫ = −(10/)sin(2+3/2) = −(10/)sin(5/2) = −5 m/s
We then substitute this value into the equation for velocity and substitute in the initial velocity of the object at t = 0 s, 0 = −3.2 m/s, to get:
(2.0 s) = 0+∫ = −3.2 m/s − 5 m/s = −8.2 m/s
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from a boat, the angle of elevation of the foot of a lighthouse on the edge of a cliff is 34 degrees. if the cliff is 150m high, how far from the base of the cliff is the boat
Answer:
Therefore, the boat is approximately 229.7 meters from the base of the cliff.
Explanation:
Let the horizontal distance between the boat and the foot of the lighthouse be x. Then, the angle of elevation of the top of the lighthouse from the boat is 90° - 34° = 56°.
We can use trigonometry to relate the angles and sides of the right triangle formed by the boat, the foot of the lighthouse, and the top of the lighthouse.
Taking the tangent of the angle of elevation of the foot of the lighthouse, we get:
tan(34°) = opposite/hypotenuse
tan(34°) = 150/x
Multiplying both sides by x, we get:
x * tan(34°) = 150
x = 150 / tan(34°)
x ≈ 229.7 meters
Therefore, the boat is approximately 229.7 meters from the base of the cliff.
Help meee!
Please for my physics Home work
A centrifuge rotor rotating at 9000 rpm is shut off and is eventually brought uniformly to rest by a frictional torque of 1.73 m⋅N
Part A: If the mass of the rotor is 3.72 kg and it can be approximated as a solid cylinder of radius 0.0760 m, through how many revolutions will the rotor turn before coming to rest?
Express your answer to three significant figures.
Part B: How long will it take?
Express your answer to three significant figures and include the appropriate units.
Answer:
Look below
Explanation:
Part A:
The initial angular velocity of the rotor can be found using the formula:
ω = v/r
where ω is the angular velocity, v is the linear velocity, and r is the radius of the cylinder. Since the rotor is rotating at 9000 rpm, we can convert this to radians per second:
ωi = (9000 rpm) x (2π/60 s) = 942.48 rad/s
The final angular velocity is zero. The frictional torque acting on the rotor is given by:
τ = Iα
where τ is the torque, I is the moment of inertia, and α is the angular acceleration. The moment of inertia for a solid cylinder is:
I = (1/2)mr^2
Substituting in the given values and solving for α, we get:
α = τ/I = (1.73 m⋅N) / [(1/2)(3.72 kg)(0.0760 m)^2] = 371.7 rad/s^2
The final angular velocity is zero, so we can use the formula:
ωf^2 = ωi^2 + 2αθ
where θ is the angle of rotation. Solving for θ, we get:
θ = (ωf^2 - ωi^2) / (2α) = (0 - (942.48 rad/s)^2) / (2 x 371.7 rad/s^2) = 6.76 revolutions
Therefore, the rotor will turn approximately 6.76 revolutions before coming to rest.
Part B:
The time it takes for the rotor to come to rest can be found using the formula:
ωf = ωi + αt
where ωf is the final angular velocity, ωi is the initial angular velocity, and α is the angular acceleration. Solving for t, we get:
t = (ωf - ωi) / α = (0 - 942.48 rad/s) / 371.7 rad/s^2 = 2.535 s
Therefore, it will take approximately 2.535 seconds for the rotor to come to rest.
The enthalpy of vaporization of Substance X is 21.0 kj/mol and its normal boiling point is 19. C Calculate the vapor pressure of X at -98. C Round your answer to 2 significant digits.
The vapor pressure of Substance X at -98. C is 1.01 atm, rounded to 2 significant digits.
What is vapor pressure?Vapor pressure is the pressure exerted by a vapor in equilibrium with its liquid or solid phase. It is an indication of a liquid's evaporation rate. It is directly related to the vapor's temperature, and increases with increasing temperature.
ln (P2/P1) = (ΔHvap/R) * ((1/T1) – (1/T2))
where:
P2 = vapor pressure of the substance at temperature T2
P1 = vapor pressure of the substance at temperature T1
ΔHvap = enthalpy of vaporization of the substance
R = ideal gas constant
T1 = normal boiling point of the substance
T2 = temperature at which the vapor pressure is being calculated
In this case, we are trying to calculate the vapor pressure of Substance X at -98. C.
We can plug in the known values into the equation to calculate the vapor pressure of Substance X at -98. C:
ln (P2/P1) = (21.0 kj/mol/8.314 J/mol-K) * ((1/19) – (1/273))
ln (P2/P1) = 0.0087
P2 = exp (0.0087) * P1
P2 = 1.009 * P1
P2 = 1.009 * 1.00 atm (atm is the vapor pressure of Substance X at 19. C, its normal boiling point)
P2 = 1.009 atm
Therefore, the vapor pressure of Substance X at -98. C is 1.01 atm, rounded to 2 significant digits.
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If a particle is projected with speed 30m/s at an angle tan ¹2, find the greatest height and the corresponding horizontal distance. Find also the time of flight.
Answer:
The greatest height will be as follows:
h = (v²sin2θ)/2g
h = [(30m/s)² (2)] / (2 × 9.8 m/s²)
h = 225m
The corresponding horizontal distance will be as follows:
d = (v² sinθcosθ)/g
d = [(30m/s)² (2 × 1)] / 9.8 m/s²
d = 306m
The time of flight will be as follows:
t = (2v sinθ) / g
t = (2 × 30m/s × 2) / 9.8 m/s²
t = 12.24s
The given problem is a projectile motion problem in Physics. It can be solved using the formulas of kinematics considering the initial velocity of the particle and the angle of projection. Substituting the given values in their respective formulas will determine the time of flight, maximum height, and horizontal distance.
Explanation:The subject matter of this question is based on the physics principle of projectile motion. To solve this problem, we can use some basic formulas of kinematics regarding time of flight, maximum height, and horizontal distance. The angle of projection here is given as \\tan^{-1}2\\ which equals approximately 63.4 degrees.
Firstly, the time of flight (T) can be found using the formula: T = 2u*sin(theta)/g, where 'u' is the initial velocity, 'theta' is the angle of projection, and 'g' is the acceleration due to gravity (approx. 9.81 m/s\^2 ).
Secondly, the greatest height (H) can be found using the formula: H = u^2*sin^2(theta)/2g.
Last but not least, the horizontal distance or the range (R) can be found using the formula: R = u^2*sin(2*theta)/g.
By substituting the given values in these formulas, we will be able to find the time of flight, the greatest height, and the horizontal distance.
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Rocks in the asteroid belt are traveling around the Sun at a distance of 3.2 Astronomical Units (AU). According to Kepler's Third Law, what is the orbital period of these rocks?
Recall Kepler's Third Law can be written as
P 2 = a 3
if the period is measured in (Earth) years and the distance is measured in AU. Follow the steps in Example 3.1 (just with a different distance value).
Pick the answer that's closest to your result:
The orbital period of the rocks in the asteroid belt is approximately 5.73 years.
What is the average distance, a, between the sun and the asteroid, expressed in astronomical units?
The distance from the Sun to the asteroid belt is between 2-4 AU, or between 300 and 600 million kilometers (186-272 million mi).
Using Kepler's Third Law, we have:
P² = a³
where P is the orbital period of the rocks in years, and a is the semi-major axis of their orbit in astronomical units (AU).
Substituting a = 3.2 AU, we get:
P² = (3.2 AU)³
P² = 32.768 AU³
P = [tex]\sqrt{32.768}[/tex] years
P ≈ 5.73 years
Therefore, the orbital period of the rocks in the asteroid belt is approximately 5.73 years.
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A light bulb that has a resistance of 3 Ω is connected to a 9 V battery.
What current will the bulb draw? A. 1/3 A B. 3 A C. 6 A D. 12 A E. 27 A
What is the bulb’s power? A. 1/3 W B. 3 W C. 6 W D. 12 W E. 27 W
Answer:
see below
Explanation:
We have ,
R = 3Ω V = 9VSo , from V = iR ,
i = V/R
i = 9/3 A
i = 3A [ option B ]
again, we know that, Power = v²/R , so ;
P = 9²/3 W
P = 27W [ option E ]
and we are done!
study of bluefish locomotion found that their tail motion produces an average thrust of 0.65 N . Suppose a 1.7 kg bluefish that is coasting horizontally at 0.45 m/s suddenly begins tail motion.
Answer:
he fish would travel a horizontal distance of 1.78 meters during the 2 seconds of tail motion
Explanation:
The initial horizontal velocity of the bluefish is 0.45 m/s. When it begins tail motion, it experiences an additional force due to the thrust produced by the tail. The thrust produced by the tail is 0.65 N. We can use Newton's second law to find the acceleration produced by this force:
F = ma
0.65 N = 1.7 kg * a
a = 0.38 m/s^2
This acceleration will cause the velocity of the bluefish to increase over time. The distance the fish travels during this time can be calculated using the kinematic equation:
d = vit + 1/2 at^2
where d is the distance traveled, vi is the initial velocity, a is the acceleration, and t is the time. Since the fish is initially coasting horizontally, its initial vertical velocity is 0 m/s. Therefore, vi = 0.45 m/s. The time interval for which the fish is tail-motoring is not given, so let's assume it is 2 seconds:
d = (0.45 m/s)(2 s) + 1/2 (0.38 m/s^2)(2 s)^2
d = 1.78 meters
Therefore, the fish would travel a horizontal distance of 1.78 meters during the 2 seconds of tail motion.
in which of the following types of circuits can the total power of the circuit be determined by adding the power dissipation of all the parts of the circuit?
In an equal circuit, all parts are associated across one another, subsequent in precisely two arrangements of electrically normal places.
The complete power in a series circuit is equivalent to the amount of power disseminated by the individual resistors.
The complete power disseminated will be equivalent to the amount of the power dispersed by every individual obstruction. Contingent upon the qualities that are known, blends of the power equation, also as Ohm's regulation, can be utilized to work out power disseminated (or some other obscure worth).
An equal circuit disseminates more power than a series circuit. For similar arrangements of resistors, the complete obstruction of the equal circuit is consistently lower than the all-out opposition in a series circuit.
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what can you say about the direction of the electric field from a negative charge? the electric field from a negative charge points ...
The electric field from a negative charge points is radially inward due to a negative charge.
What is electric field?An electric field is a physical fridge and it by the electric charges that exert a force on other charges extracting or appealing them. Electric electrocuted by electric chargers either stationary or moving the electric field is a vector field meaning that it is both thank you and direction the strength of the electric field is measured in moles per metre electric field and used in a variety of application from our generation to medical treatments.
When you move in an electric field, the electric potential changes since the electric field is a vector field. However, if you move perpendicular to the electric field, the electric potential remains unchanged. This is because the electric field strength is constant in all directions, except in the direction of the electric field. Therefore, if you move perpendicular to the electric field, the electric potential does not change.
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. A steel bar 35mm by 35mm in section and 100mm in length is acted upon by a tensile load of 180KN along its longitudinal axis and 400kN and 300kN along the axes of lateral surfaces as shown in figure 2 below. Determine: (i) change in the dimensions of the bar (ii) change in volume Take E = 205 GPa Poisson's ratio (v) = 0.3
(i) The change in length is 8.78 x 10⁻⁸ m and the change in the width is -2.63 x 10⁻⁸ m
(ii) The change in volume of the bar is 7.53 x 10⁻¹¹ m³.
What is the change in the dimensions of the bar?
The bar undergoes elongation and reduction in cross-sectional area due to the applied loads.
Using the formula for longitudinal strain, we can calculate the change in length (ΔL) as follows:
ΔL = (180 × 10³ N) x (100 × 10⁻³ m) / (205 × 10⁹ N/m²)
ΔL = 8.78 x 10⁻⁸ m
The change in width (Δb) can be calculated using the formula for lateral strain:
Δb = -v x ΔL = -0.3 x ΔL
Δb = -0.3 x 8.78 x 10⁻⁸ m
Δb = -2.63 x 10⁻⁸ m
The change in volume can be calculated as follows:
ΔV = (35 × 10⁻³ m) x (35 × 10⁻³ m) x (ΔL + Δb)
ΔV = (35 × 10⁻³ m) x (35 × 10⁻³ m) x (ΔL - 0.3 x ΔL)
ΔV = (35 × 10⁻³ m) x (35 × 10⁻³ m) x (8.78 x 10⁻⁸m -2.63 x 10⁻⁸ m)
ΔV = 7.53 x 10⁻¹¹ m³
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Determination of unknown resistance In order to determine the nature of an electric component (D) we set up an electric circuit as follows → The electric component (D) is connected to a DC generator of adjustable voltage * An ammeter (A) is connected to measure the current I that traverse (D) A voltmeter (V) is connected to measure the voltage U across (D) 1- Draw a diagram that represent this electric circuit.
Here is a straight forward schematic showing the electrical circuit:
DC Generator ----> Component (D) ----> Ammeter (A) ----> Voltmeter (V)
What purpose does a DC generator serve?
The uses of DC generators
These generators are employed to power illumination, excite alternators, and charge cells. In Vdc railroads, they are utilized to supply dc current voltage for diesel generator. They are found in Stepper motor whenever rotary encoder is necessary.
How do DC generators operate?
A copper coil rotated in a magnetosphere induces a voltage, which is how a current (DC) generator operates. The voltage that is produced in the coil depends on how quickly the coil spins in the magnetosphere.
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an athlete swings a ball, connected to the end of a chain, in a horizontal circle. the athlete is able to rotate the ball at the rate of 7.28 rev/s when the length of the chain is 0.600 m. when he increases the length to 0.900 m, he is able to rotate the ball only 6.39 rev/s. (a) What is the centripetal acceleration of the ball at 7.72 rev/s? (answer in m/s^2)
(b) What is the centripetal acceleration at 6.39 rev/s?
(a) The centripetal acceleration of the ball at 7.72 rev/s is 30.2m/s²
(b) The centripetal acceleration at 6.39 rev/s is 33.9m/s².
What is a radius?
It is possible to define a circle as the locus of a point travelling on a plane while maintaining a constant distance from a fixed point. The radius of a circle is the distance from any point on the circle to its centre.Using the definition of speed and noting that the ball travels in a circular path,
v= d/Δt
= 2πR/T
where R is the radius of the circle and T is the period, that is, the time interval required for the ball to go around once. For the periods given in the problem,
8.00rev/s→T= 1/8.00rev/s =0.125s
6.00rev/s→T= 1/6.00rev/s =0.167s
Therefore, the speeds in the two cases are: 8.00rev/s→v= 2π(0.600m)/ 0.125s
=30.2m/s²
6.00rev/s→v= 2π(0.900m)/0.167s
=33.9m/s²
Therefore, 6.00rev/s gives the greater speed of the ball.
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The following circuit diagram is partially incomplete.
A device is added to the electrical circuit to measure the total current in the circuit. Which of the following circuit symbols should be included in the diagram to represent this device?
The device which is used to measure the over all current through the circuit is an ammeter. Option d is the symbol of ammeter.
What is an ammeter ?An ammeter is a device used to measure electric current in amperes, either in direct current (DC) or alternating current (AC). Because only a tiny fraction of the current is sent via the meter mechanism at high levels and the majority is carried by a shunt in parallel with the meter, an ammeter can measure a wide range of current values.
An ammeter is represented by a circle with a capital A inside it in circuit diagrams. Accuracy and working principles of ammeters differ. With accuracy ranging from 0.1 to 2.0 percent, the movement ammeter monitors direct current flowing through a coil hanging between the poles of a magnet.
A moving coil revolving in the field created by a stationary coil is how the electrodynamic ammeter works. Therefore, option d is correct.
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The symbol used in diagram to represent the device is ammeter symbol that is circle with an A in it.
What is electric current?Electric current is defined as the rate of flow of electrons in a conductor. The SI Unit of electric current is the Ampere.
In given circuit,
A device is added to the electrical circuit to measure the total current in the circuit,
Ammeter is the device used to measure the current in a circuit. The ammeter is connected in series with the circuit, so that the current to be measured flows directly through the ammeter.
Ammeter symbol is a circle with an A in it.
Hence, ammeter's symbol will be used in diagram to represent the device.
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A 0.8-kg apple falls from a tree branch that is 2.5 m above the ground. How fast is it moving when it hits the ground, in m / s ? (Round your answer to one decimal place if necessary.)
The required, apple is moving at a velocity of 7 m/s when it hits the ground.
What is the equation of motion?The equation of motion is a mathematical expression that describes the relationship between the position, velocity, and acceleration of an object. It can be used to predict the motion of an object
The velocity of the apple just before it hits the ground can be calculated using the equation of motion for freely falling objects, which is:
v = √2gs
where v is the final velocity, g is the acceleration due to gravity (9.8 m/s²),
v = √2gs
Substitute the values in the above equation,
v = √[2 × 9.8 × 2.5]
v = 7 m/s
So the apple is moving at a velocity of 7 m/s when it hits the ground.
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1a) Assuming a flat slope for Weber's Law for weight detection what else might be true? (Note: in the real world humans do not have a flat slope for weight detection so the correct answer might be ridiculous in the real world)A. The JND is always 5 poundsB. The JND is always 10% of the starting weightC. The JND is always equal to the starting weightD. Weber's Law would be proven false1b) What might, in the real world, display a flat slope for weight detection?A. A cameraB. An electric scaleC. A humanD. An airplane
In the real world, humans do not have a flat slope for weight detection. However, some devices such as cameras, electric scales, and airplanes may display a flat slope for weight detection.
For instance, when detecting a change in weight with a hand-held device, humans would be less accurate than with a more sophisticated device such as an electric scale. Furthermore, when detecting a change of weight in an environment with multiple stimuli, such as a room filled with noise, humans may not be able to accurately detect the change at all.
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page 29 1.4. how is anthropology changing today? identify the ways anthropologists are adapting to the current era of intensified globalization.
Ways Anthropologists are adjusting by focusing on the ways that migration and communication patterns connect groups and by altering their study methodologies.
The anthropologist's job description:
Anthropologists as well as archaeologists both research the origin, progress, and behaviors of individuals. They examine global linguistic and cultural diversity, physical characteristics, and artifacts found in archaeology. creating research plans that include underrepresented topics. using research methods that make advantage of an extensive study design. promoting the use of collaborative techniques to co-create material
What do anthropologists study?
Anthropology compares human communities across borders and through time. For instance, we contrast the current and earlier legal and religious systems. While contrasting political systems, including family relationships, we look at multinational organizations.
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1 point
A man jumps from an airplane and his speed of descent is given by V=50(1-e0.21) meters per second, where t is the
time in seconds. Find the time taken for his speed to reach 40 m/s.
Type your answer.....
The time taken for the man's speed to reach 40 m/s is 8.15 seconds.
What do you mean by speed?
Speed is the rate at which something moves or operates. It is usually measured in units such as miles per hour (mph) or kilometers per hour (kph). Speed is often used to describe the rate of change in a physical quantity, such as the speed of light. It can also be used to describe the rate of change in a process or activity, such as the speed at which a computer can process data.
So,
V = 50(1-e^-0.21t)
40 = 50(1-e^-0.21t)
e^-0.21t = (50-40)/50
-0.21t = ln((50-40)/50)
t = ln((50-40)/50)/-0.21
t ≈ 8.15 seconds
Therefore, the time taken is 8.15 seconds.
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True/Falseat any given point, the net electric field can point in multiple directions at any given point, the net electric field is the vector sum of all component electric fields
At any given point, the net electric field can point in multiple directions at any given point, the net electric field is the vector sum of all component electric fields - False
What is the electric field?The electric field is a measure of the electric force experienced by a charged particle in a specific location. It is a vector field, meaning it has both magnitude and direction.
The electric field at a particular point in space can be visualized as a field of force lines that emanate from positive charges and converge towards negative charges. The strength of the electric field is proportional to the number of force lines and the direction of the field is the direction that a positive test charge would experience a force if placed at that point.
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a 240 g air-track glider is attached to a spring. the glider is pushed in 10.4 cm and released. a student with a stopwatch finds that 8.00 oscillations take 12.0 s .
The spring constant of the spring is 5.1N/m.
The formula for calculating the period of oscillation is expressed as:
[tex]T = 2\pi \sqrt{\dfrac{m}{k}}[/tex]
,where m is the mass of the spring and k is the spring constant.
Making the spring constant "k" the subject of the formula will give;
[tex]k = 4\pi^2\dfrac{m}{T^2}[/tex]
Get the period of oscillation "T"
[tex]T = \dfrac{1}{f}[/tex]
frequency "f" is the number of oscillations completed in one second.
If a student with a stopwatch finds that 8 oscillations take 12.0 s, the number of oscillations in one sec will be 12/8 = 1.5 oscillations.
Period T = 1/1.5 = 0.67 seconds
Get the required spring constant,
[tex]k = 4\pi^2\dfrac{0.240}{(0.67)^2}\\k = 21.06[/tex]
Hence the spring constant of the spring is 21.06 N/m.
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the ampacity adjustment factors of 310.15(b)(3)(a) shall not apply to conductors installed in surface metal raceways where the __________.
conductors are not subjected to additional heat due to the raceway installation.that the raceway provides increased cooling and/or ventilation.
What is the ventilation ?Ventilation is the process of providing fresh air to an enclosed space and removing stale air from the same space. It is an important factor in maintaining the quality of air in an environment, both in terms of temperature, humidity, and gaseous pollution. Ventilation is accomplished by either mechanically or naturally moving air from an area of high pressure, where it is typically warmer, to an area of lower pressure, where it is typically cooler. Mechanical ventilation is typically used in closed buildings or spaces, such as homes, offices, and industrial buildings, while natural ventilation relies on the natural flow of air through open windows, doors, and other openings.
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Find the distance traveled by a climber if she climbs 10 meters up and then repels 10 meters back down. Include both magnitude and direction.
Answer:
Explanation:
Let up be the + direction.
Distance is the total length traveled.
Distance = 10 + 10 = 20 m
Displacement = 10 - 10 = 0
A student sees a mirror image of a tree in a pond on a very still day. The student is able to see a mirror image of the tree in the pond because light
striking the surface of the water -
bends downward.
bounces off.
becomes brighter.
is absorbed.
Answer:
B.
Explanation:
What causes a reflection in still water?
Reflection in water is caused when light hits the surface of still water and travels to our eye so we can see the complete image and light it's reflecting.
All materials reflect light in some way.
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Help please how do you do this
The impulse is given as -75 n.s
How to solve for impulseWe would first have to solve for the initial momentum and then the final momentum
The initial momentum is given as 6 x 5 = 30
The final momentum = -9 x 5 = -45
Then the impulse would be the change in momentum which is gotten as
I = Pf - Pi
I = -45 - 30
I = -75
The impulse is given as I = -75
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An electronic package with a surface area of 1 m2 placed in an orbiting space station is exposed to space. The electronics in this package dissipate all 1950 W of its power to space through its exposed surface. The exposed surface has an emissivity of 1.0 and an absorptivity of 0.25. Given: 0 = 5.67x10-8 W/m2K4Determine the steady state exposed surface temperature of the electronic package if the surface is not exposed to the sun. If the surface is not exposed to the sun, the surface
The electronic package's steady state temperature can be calculated using the Stefan-Boltzmann Law, which states that the total energy radiated per unit surface area per unit time is proportional to the fourth power of the temperature.
The electronic package's energy balance equation is as follows:
Power absorbed minus power radiated equals power generated.
where P = absorptivity * incoming radiation P = emissivity * Stefan-Boltzmann constant * T4 Power generated = 1950 W (constant)
Because the surface is not in direct sunlight, we can assume that the incoming radiation is 0 and the power absorbed is 0.
Thus, the energy balance equation becomes:
0 - Power radiated = 1950 W
or
Power radiated = 1950 W
We can use the Stefan-Boltzmann Law to calculate the surface temperature:
Power radiated = emissivity * Stefan-Boltzmann constant * T^4
1950 W = 1 * 5.67 x 10^-8 W/m2K^4 * T^4
T^4 = (1950 / (5.67 x 10^-8))
T = ( (1950 / (5.67 x 10^-8))^(1/4))
The electronic package's steady state temperature is the temperature at which the amount of power generated by the electronics equals the amount of power radiated to space.
Full question.
An electronic package with a surface area of 1 m2 placed in an orbiting space station is exposed to space. The electronics in this package dissipate all 1 kW of its power to the space through its exposed surface. The exposed surface has an emissivity of 1.0 and an absorptivity of 0.25.Given: 0 = 5.67x10-8 W/m2K4 Determine the steady state exposed surface temperature of the electronic package (a) if the surface is exposed to a solar flux of 750 W/m2, and (b) if the surface is not exposed to the sun.
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A small frictionless 4.40 kg cart is released from rest at the top of a hill (assume the hill is perfectly straight and flat, like a ramp). A student is interested in how the motion of the frictionless cart on the hill differs from the motion of a solid cylinder when they are released from rest. The length of the hill from starting point to ending point is 366 m and the point of release for the cart is 53 m above the ending point.
a.) Determine the acceleration of the cart.
b.) Determine the time it takes the cart to travel from the starting point to the ending point.
Now, the solid cylinder with the same mass as the cart and a radius of 0.024 m is released from rest at the top of the hill. Assume there is more than enough friction so that the cylinder rolls without slipping.
c.) Determine the acceleration of the cylinder.
d.) Determine the time it takes the cylinder to travel from the top of the ramp to the bottom.
The acceleration of the cart is 43.12 m/s².
Time it takes the cart to travel from the starting point to the ending point is 3.8 sec.
Acceleration of the cylinder is a = g - (v²)/R.
Time it takes the cylinder to travel from the top of the ramp to the bottom is d = v_0t + 1/2at².
How to calculate acceleration and time?a.) The acceleration of the cart can be calculated using the formula g = 9.8 m/s², where g is the acceleration due to gravity. a = F/m = m × g = 4.40 kg × 9.8 m/s² = 43.12 m/s²
b.) The time it takes the cart to travel from the starting point to the ending point can be calculated using the kinematic equation:
d = v_0t + 1/2at²,
where d is the distance traveled, v_0 is the initial velocity (which is 0 for this case), a is the acceleration (determined in part a), and t is the time.
366 m - 53 m = 313 m
313 = 0t + 1/2(43.12)t² = 1/2(43.12)t²
313 = 21.56t², t² = 313 / 21.56
t² = 14.52, t = √14.52 = 3.8 sec.
c.) The acceleration of the cylinder can be calculated using the formula a = g - (v²)/R, where v is the linear velocity of the cylinder's center of mass and R is the radius of the cylinder.
d.) The time it takes the cylinder to travel from the top of the ramp to the bottom can be calculated using the kinematic equation:
d = v_0t + 1/2at²,
where d is the distance traveled, v_0 is the initial velocity (which is 0 for this case), a is the acceleration (determined in part c), and t is the time.
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determine for what energy above ef (in terms of kt) the boltzmann approximation has an error less than 1%. (b) give the value of the probability function at this energy
The probability function at this energy where the Boltzmann approximation has an error less than 1%. (b) is given by
P(E) = (1/Z) * (1/100) * exp(-Ef/kT).What is Boltzmann approximation?The Boltzmann approximation states that the probability of a particle being in a state of energy E is proportional to the exponential of negative E divided by kT,
where
k is the Boltzmann constant and
T is the temperature in kelvins.
So, the probability function can be written as:
P(E) = (1/Z) * exp(-E/kT),
where
Z is the partition function, which normalizes the probabilities to add up to 1.
To find the energy above Ef (Ef is the Fermi energy) where the Boltzmann approximation has an error less than 1%, we can solve for the energy E such that P(E) is equal to 1% of the maximum probability P(Ef). We can set the following equality:
P(E) = 0.01 * P(Ef)
P(E) = 0.01 * (1/Z) * exp(-Ef/kT)
Rearranging and substituting the expression for P(E) from the Boltzmann approximation, we get:
E = Ef - kT * ln(100).
So, the energy above Ef where the Boltzmann approximation has an error less of than 1% is Ef minus kT times the natural logarithm of 100.
For the value of the probability function at this energy, we can use the expression for P(E) from the Boltzmann approximation:
P(E) = (1/Z) * exp(-E/kT)
P(E) = (1/Z) * exp(-(Ef - kT * ln(100))/kT)
P(E) = (1/Z) * (1/100) * exp(-Ef/kT).
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