Among the original group of 10,000 stars, approximately 100 stars have planets.
The following data has been given about planetary systems using the transit technique: about 1% of planetary systems can be detected using the transit technique. Imagine that you studied a group of 10,000 stars for many years, watching for them to dip in brightness.
After a long survey, you have discovered 10 planetary systems - stars with planets orbiting them.
The proportion of planetary systems that can be discovered using the transit technique is 1%.The planetary system detected: 10 planets out of 10,000 stars
Among the original group of 10,000 stars, we can estimate that 1% of the stars actually have planets, based on the proportion of the planetary systems that can be detected using the transit technique.
Therefore, the estimated number of stars with planets will be: 1/10 * 10000
= 100
Thus, an estimated 100 stars out of the 10,000 that were observed may have planets.
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The coefficient of static friction is 0.60 between the two blocks in figure. The coefficient of kinetic friction between the lower block and the floor is 0.20. Force causes both blocks to cross a distance of 5.0 m, starting from rest.What is the least amount of time in which this motion can be completed without the top block sliding on the lower block?
The maximum force of static friction is 29.4N. Using the equations of motion and the given values, the least amount of time taken for the motion is 3.19 seconds.
The force exerted on both blocks must be less than or equal to the maximum force of static friction between the two blocks, which can be estimated using the coefficient of static friction and the weight of the top block. This will prevent the top block from sliding onto the bottom block. 29.4 N is the greatest static friction force. We can calculate the acceleration, which is 1.96 m/s2, using the equations of motion and the assumptions that the acceleration of both blocks is a and the time required to travel a distance of 5.0 m is t. The time taken, which is 3.19 seconds, may then be calculated using the equation for the distance traveled by the bottom block.
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a baseball is hit almost straight up into the air with a speed of estimate (a) how high it goes, (b) how long it is in the air. (c) what factors make this
A baseball is hit almost straight up into the air with a speed, the greater the ball's potential energy will be upon launch, resulting in a greater maximum height.
(a) The time it takes to reach the maximum height. (b) The duration of the flight can be calculated using the following formula:(c) The launch angle, initial speed, and launch height are all variables that influence how high and far the ball flies. The higher the launch angle, the higher the ball's height; the higher the initial velocity, the higher and farther the ball will travel; and the greater the launch height, the greater the ball's potential energy will be upon launch, resulting in a greater maximum height.
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Is the liquid pressure higher on the sides of a beaker or on the bottom of a beaker?
Explanation:
The pressure stays the same. Although the depth increases, the density must also decrease.
Eight little spheres of mercury coalesce to form a single sphere. Compared to the combined surface areas of the eight little spheres, the surface area of the big sphere is? the same
greater
less
The surface area of the big sphere is greater than the combined surface areas of the eight little spheres. Therefore, the correct option is option 2.
When eight small spheres coalesce to form a single large sphere, the surface area of the large sphere is greater than the combined surface area of the eight small spheres. The coalescence of eight small spheres into a single large sphere occurs when eight small spheres combine into a single large sphere.
If we were to add up the surface area of each of the 8 small spheres, we would obtain:
8 × 4πr² = 32πr².
If we were to add up the surface area of the large sphere, we would obtain:
4πR²
where R is the radius of the large sphere.
Note that R is greater than r because the sum of the small spheres' surface area is smaller than that of the large sphere.
The formula for the surface area of a sphere is A = 4πr².
As a result, the surface area of the large sphere is greater than the combined surface area of the eight little spheres. Therefore, compared to the combined surface areas of the eight little spheres, the surface area of the big sphere is greater.
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Chris jumps off a bridge with a bungee cord (a heavy stretchable cord) tied around his ankle. (Figure 1). He falls for 15 in before the bungee cord begins to stretch. Chris's mass is 79 kg and we assume the cord obeys Hooke's law. F = - kx, with 60 N/m. If we neglect air resistance, estimate what distance d below the bridge Chris's foot will be before coming to a stop. Ignore the mass of the cord (not realistic, however) and treat Chris as a particle. Express your answer to two significant figures and include the appropriate units.
Answer:
d=54 m
Explanation:
The NASA Space Launch System rocket that will carry the Artemis mission to the Moon travels 500 feet (152 m) straight up in the first 7 seconds of flight. It weighs 5.75 million pounds (mass of 2.61e6 kg).In this problem, we'll calculate the total force the rockets are providing. The numbers will be randomized slightly. Since the rocket is using fuel, the question is an approximation anyway.What is the weight of the rocket, if its mass is 2.46E+6 kg? Assume g = 9.8 m/s2.At launch, the rocket travels upwards at an acceleration of 5.51 m/s2. This tells us that it must be acted on by a net force of 1.36E+7 N. If that is the net upward force, what is the total upward force provided by the engines?
The weight of the rocket, with a mass of 2.46E+6 kg, is equal to the force of gravity acting on the rocket, which is the mass multiplied by the acceleration due to gravity and the upward force of its own and its is calculated as 26,716,460 N.
At launch, the total upward force provided by the engines is equal to the net upward force of 1.36E+7 N, as the rocket accelerates upwards at [tex]5.51 m/s^2[/tex]. This is the force required to overcome the rocket's weight, as well as the drag from the atmosphere and the force of the fuel pushing the rocket forward.
The NASA Space Launch System rocket that will carry the Artemis mission to the Moon travels 500 feet (152 m) straight up in the first 7 seconds of flight. It weighs 5.75 million pounds (mass of 2.61e6 kg).
The formula to calculate the weight of the rocket, if its mass is 2.46E+6 kg is given by
[tex]W= 2.46E+6 kg * 9.8 m/s^2\\= 24,108,000 Newtons[/tex]
Here g is the acceleration due to gravity, [tex]g=9.8m/s^2[/tex].
At launch, the rocket travels upwards at an acceleration of 5.51 m/s². This tells us that it must be acted on by a net force of 1.36E+7 N. If that is the net upward force, the total upward force provided by the engines would be the sum of the upward force provided by the engines and the upward force provided by gravity, so:
[tex]F_{upward}=1.36E+7 N + 2.46E+6 kg * 5.51 m/s^2\\ = 26,716,460 N[/tex]
Therefore, the total upward force provided by the engines is 26,716,460 N.
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a planet is discovered that causes a 0.03% drop in brightness for a 2 solar mass star. what is the size of this planet?
This planet must be quite small, as a 0.03% drop in brightness corresponds to a small size.
To calculate the size of the planet, you would need to know the radius of the star and the distance of the planet from the star. With that information, you can calculate the size of the planet using the formula:
Size = (Brightness drop x Distance²) / (4 x pi x Radius²)
So, to find the size of this planet, you would need to know the radius of the 2 solar mass stars and the distance of the planet from the star.
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(a) Calculate the magnitude of the angular momentum of the earth in a circular orbit around the sun. Is it reasonable to model it as a particle? (b) Calculate the magnitude of the angular momentum of the earth due to its rotation around an axis through the north and south poles, modeling it as a uniform sphere. Please show your work.
(a) Angular momentum of Earth in a circular orbit around the sun is 2.66 × 10^40 kg m^2/s. It can be modeled as a particle. (b) The angular momentum of Earth due to its rotation around an axis through the poles is 7.07 × 10^33 kg m^2/s, modeled as a uniform sphere.
An object's angular momentum, which measures its rotating motion, is essential to many physical processes. The orbit of the Earth around the sun gives rise to the first sort of angular momentum, while the rotation of the Earth about its axis produces the second. The angular momentum of the Earth's orbit around the sun is quite large, at around 2.66 1040 kg m2/s. Given that the size and form of the Earth have little bearing on its orbit, it seems sensible to treat it as a particle for this computation. In comparison, the Earth's rotation about its own axis generates angular momentum that is only about 7.07 1033 kg m2/s in size. This kind of angular momentum is calculated using the uniform sphere's moment of inertia. In several disciplines, including astronomy and geophysics, the Earth's angular momentum is a crucial number.
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what force (magnitude and direction) does the seat exert on a 53.0-kg child when the rider is halfway between top and bottom?
The seat will exert a downward force of 494.5 N [magnitude] in the direction of the child's motion [direction] on a 53.0-kg child when the rider is halfway between the top and bottom of the ride.
This can be calculated using the equation F = mg, where m is the mass of the child (53.0 kg) and g is the acceleration due to gravity (9.81 m/s²). Therefore, F = (53.0 kg) x (9.81 m/s²) = 494.5 N. The direction of the force is always in the direction of the child's motion, which in this case is downward.
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a thin cord is wrapped around a grindstone of radius 0.30 m and mass 25 kg supported by bearings that produce negligible friction torque. the cord exerts a steady 20-n tension force on the grindstone, causing it to accelerate from rest to 60 rad/s in 12 s. determine the rotational inertia of the grindstone.
The rotational velocity of the grindstone was 60 rad/s after 12 s, the rotational inertia of the grindstone is 3.75 kg m². Rotational inertia depends upon mass and radius.
What is the rotational inertia of the grindstone?The rotational inertia, I, of the grindstone is 3.75 kg m². And can be determined using the following equation:I = 1/2 × m × r².
here m is the mass of the grindstone (25 kg) and r is the radius of the grindstone (0.30 m).
Thus, the rotational inertia of the grindstone is: I = 1/2 × 25 kg × (0.30 m)² = 3.75 kg m².
The steady 20 N tension force on the grindstone provides a torque that can be determined using the equation: Torque = r × F where r is the radius of the grindstone (0.30 m) and F is the tension force (20 N).
Therefore, the torque on the grindstone is
Torque = 0.30 m × 20 N = 6
Using the equation for rotational acceleration, the rotational acceleration, α, of the grindstone can be determined:
α = Torque / I where Torque is the torque on the grindstone (6 Nm) and I is the rotational inertia (3.75 kg m²).
Thus, the rotational acceleration of the grindstone is: α = 6 Nm / 3.75 kg m2 = 1.6 rad/s²
Using the equation for rotational velocity, the rotational velocity, ω, of the grindstone can be determined:
ω = α × t
Since, the rotational velocity of the grindstone was 60 rad/s after 12 s, the rotational inertia of the grindstone is 3.75 kg m².
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What happens when thermal energy is removed from a substance?(1 point) Responses All substances will freeze. All substances will freeze. The substance loses potential energy. The substance loses potential energy. The substance’s atoms lose kinetic energy. The substance’s atoms lose kinetic energy. The substance’s particles speed up
Part L The figures below show four circuits, with the resistances of the resistors given. In all cases, the emf of the battery is 10 V. Rank the circuits in order of descending total current coming out of the battery. (You should be able to answer this question using what you have already learned, but if you want, feel free to build the four circuits and make measurements.) Reset Help 9.07 10.00 9.07 10.00 10.00 00 9.07 10.000 10.00 50.00 10.00 IL- Greatest current Smallest current
The order of descending total current coming out of the battery is Circuit 1, Circuit 2, Circuit 3, Circuit 4.
The total current coming out of the battery can be calculated by the formula I = V/R, where V is the emf of the battery (10 V in this case) and R is the total resistance of the circuit. From this, we can calculate the total current for each of the four circuits:
Circuit 1: I = 10V/9.07Ω = 1.10ACircuit 2: I = 10V/10.00Ω = 1.00ACircuit 3: I = 10V/9.07Ω + 10.00Ω + 10.00Ω = 0.72ACircuit 4: I = 10V/50.00Ω = 0.20ATherefore, the order of descending total current coming out of the battery is Circuit 1, Circuit 2, Circuit 3, Circuit 4.
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the deflection plates in an oscilloscope are 10 cm by 2 cm with a gap distance of 1 mm. a 100 volt potential difference is suddenly applied to the initially uncharged plates through a 925 ohm resistor in series with the deflection plates. how long does it take for the potential difference between the deflection plates to reach 60 volts? 1.50272e-8 correct: your answer is correct. s what will the electric potential difference across the capacitor be a long time after the circuit is connected? v what will the electric potential difference across the resistor be a long time after the circuit is connected? v
It takes 1.64 µs for the potential difference between the deflection plates to reach 60 volts.The electric potential difference across the capacitor and resistor will be equal to the applied potential difference, which is 100 volts.
Data from the question: Area of deflection plates = 10 cm x 2 cm = 20 cm²
Gap distance = 1 mm = 0.1 cm
Potential difference = 100 volts
Resistor = 925 ohm
We know that the capacitance of a capacitor can be given as,
C =ε₀A/d
Where, C = Capacitance, ε₀ = Permitivity of free space, A = Area of the capacitor plates, d = Gap distance between the plates.
Now, we can calculate the capacitance of the deflection plates as,
C = ε₀A/d = 8.85 × 10^-12 x 20 / 0.1 = 1.77 × 10^-9 F
Also, we know that,C = Q/V. Putting the given values in this equation,
1.77 × 10^-9 F = Q/100V
Thus, the charge on the plates can be given as,
Q = C × V = 1.77 × 10^-9 F × 100 V = 1.77 × 10^-7 C
Now, we know that Current I = V/R, Where V = Potential difference, R = Resistance. We can calculate the current flowing through the circuit as
I = V/R = 100/925 = 0.108 A
Now, we can calculate the time taken for the potential difference to reach 60 volts as,Q = It
Charge, Q = 1.77 × 10^-7 CT = Q/I = 1.77 × 10^-7 / 0.108 = 1.64 × 10^-6 s
Thus, it takes 1.64 µs. For the potential difference between the deflection plates to reach 60 volts. As the plates of the capacitor are connected to a resistor in series, we can assume that the potential difference across the capacitor is equal to the potential difference across the resistor. Therefore, the electric potential difference across the capacitor and resistor will be equal to the applied potential difference, which is 100 volts, after a long time.
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If we were to double the radius of the wire and re-suspend the weight, which of the following would be correct.A)The strain experienced by the wire would increase by a factor of 4.B)Young's modulus would increase by a factor of 4.C)The stress experienced by the wire would decrease by a factor of 4.D) The strain experienced by the wire would increase by a factor of 4.E)The strain experienced by the wire would increase by a factor of 2.F)Young's modulus would be reduced by a factor of 4.
If we were to re-suspend the weight and double the wire's radius, The strain experienced by the wire would decrease by a factor of 2 will be correct.
It is an elastic modulus that describes the stress and strain of a material when subjected to elastic deformation under tension or compression.
It characterizes the material's elasticity (i.e., elastic modulus) and is one of the most important mechanical properties of solids.
The formula for strain is ε = ΔL/L.
The original length is denoted by L, while the change in length is denoted by ΔL.
The formula for Young's modulus is E = σ / ε. E is Young's modulus, σ is the stress, and ε is the strain.
The S.I. unit of Young's modulus is Pascals (Pa).
Therefore, The strain experienced by the wire would decrease by a factor of 2 will be correct.
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escribe the motion of a proton (a) after it is released from rest in a uniform electric field. describe the
The motion of a proton after it is released from rest in a uniform electric field is that it will move in a straight line. The direction of motion of a proton will be towards the direction of the electric field. The speed of the proton will increase with time. This is because the proton experiences a force due to the electric field. The force on a proton is given by F = qE,
Where:
F is the force. q is the charge on the proton. E is the electric field.The acceleration of the proton is given by a = F/m, where m is the mass of the proton. The velocity of the proton after a time t is given by v = at. The position of the proton after a time t is given by x = 1/2at^2 + x0, where x0 is the initial position of the proton.
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open the experiment file containing your pressure-temperature data. make sure that your graph displays temperature on the horizontal axis. if the relationship between pressure and temperature appears to be linear, fit a line to your data. if not, take the necessary steps to obtain a linear relationship. 2. is it correct to state that the pressure is proportional to the celsius temperature; i.e., does a doubling of the temperature produce a doubling of the pressure? if not, then manipulate your graph (logger pro) or use your equation to determine the celsius temperature at which the pressure of a gas should drop to zero. your instructor may guide you in this process. compare your experimental value to the accepted value for this temperature. 3. write a statement relating pressure to the absolute temperature of a gas.
The absolute temperature is determined by the Kelvin scale, which is the sum of the Celsius temperature and 273.15.
What is a temperature scale?A temperature scale is a system used to measure and quantify the degree of hotness or coldness of an object or substance. It defines a set of numerical values that correspond to specific temperatures, which can be used to compare temperatures and measure changes in temperature over time.
To open the experiment file containing your pressure-temperature data, first launch the Logger Pro software. From there, you can access your file and adjust the graph's axes accordingly. If the data appears to follow a linear relationship, then fit a line to the data by clicking on the Linear Fit option from the Analyze menu. If the data does not appear to follow a linear relationship, take the necessary steps to adjust the graph and obtain a linear relationship.
It is not correct to state that the pressure is proportional to the Celsius temperature. Pressure increases as temperature increases, but it is not a linear relationship. To find the temperature at which the pressure of a gas should drop to zero, you can either manipulate the graph or use the equation to determine the Celsius temperature. Once you have obtained the temperature, compare it to the accepted value for this temperature.
The pressure of a gas is proportional to the absolute temperature of a gas. The absolute temperature is determined by the Kelvin scale, which is the sum of the Celsius temperature and 273.15.
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Part C Is the impulse delivered to the superball during its collision with the scale greater than, less than, or equal to the impulse delivered to the clay during its collision with the scale? •O The impulse delivered to superball is greater than the impulse delivered to the clay. O The impulse delivered to superball is equal to the impulse delivered to the clay. O The impulse delivered to superball is less than the impulse delivered to the clay.
Compared to the impulse provided to clay, the superball receives a stronger impulse.
The quantity of impulse is influenced by the amount and duration of applied force. The change in momentum that an item experiences is represented by the impulse.
Both the clay and the superball feel an impulse during a contact, but the size of the impulse is determined by the forces and their duration.
The superball suffers a larger force and a longer duration of force during the contact since it is comprised of a material that is very elastic. As a result, the superball receives a stronger impulse.
The clay, on the other hand, is formed of a substance that is extremely inelastic, which results in a lesser force and a shorter duration of force during the contact.As a result, the impulse that reaches the clay is reduced.
As a result, when the superball collides with the scale, it generates a larger impulse than when clay collides with the scale.
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29.If Sally is attempting to develop muscular endurance in her legs, the mostbeneficial range of repetitions she should perform in her three sets of legextensions is_____________.
A.4-8 repetitions
B.6-15 repetitions
C.10-15 repetitions
D.12-20 repetitions
The most beneficial range of repetitions Sally should perform in her three sets of leg extensions if she is attempting to develop muscular endurance in her legs is 12-20 repetitions. Thus, the correct option is D.
What is muscular endurance?Muscular endurance is the ability of the muscles to perform continuously without being fatigued. It helps you maintain a specific body posture or position over an extended period or perform repeated movements over time. Muscular endurance is an essential component of fitness and an essential aspect of most sports.
The goal of training to develop muscular endurance is to condition the muscles to perform repeated contractions over an extended period. Muscular endurance is an essential aspect of any resistance training program. To develop muscular endurance, Sally should perform high repetitions of an exercise with lighter weight loads.
12-20 repetitions in each set are generally used to develop muscular endurance for most exercises, as this range can be accomplished with a light enough weight to avoid muscle fatigue while still providing the necessary stimulation to enhance endurance.
Therefore, the correct option is D.
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A car has an intial velocity of 50 km hr after 5 h, its final velocity is 70 km hr. solve for the car acceleration
Answer:
4 km/hr^2
Explanation:
We can use the formula for acceleration:
a = (v_f - v_i) / t
where:
a = acceleration
v_f = final velocity
v_i = initial velocity
t = time taken
Substituting the given values, we get:
a = (70 km/hr - 50 km/hr) / 5 hr
a = 20 km/hr / 5 hr
a = 4 km/hr^2
5x, 10x and 20x objective lenses. what is the maximum total magnification that can be achieved with this microscope?
The maximum total magnification that can be achieved with a microscope that has 5x, 10x, and 20x objective lenses can be found by multiplying the magnification of the objective lens by the magnification of the eyepiece lens.
What is Magnification?This can be expressed as:
Magnification = objective lens magnification × eyepiece lens magnification
The eyepiece lens magnification is typically 10x for most microscopes, so we can simply find the maximum total magnification by multiplying each objective lens magnification by 10 and then adding them together:
Maximum Total Magnification = (5 × 10) + (10 × 10) + (20 × 10)
Maximum Total Magnification = 50 + 100 + 200
Maximum Total Magnification = 350
Therefore, the maximum total magnification that can be achieved with this microscope is 350x.
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a 6.96 nc charge is located 1.90 m from a 3.86 nc point charge. find the magnitude of the electrostatic force, in nano newtons, nn, that one charge exerts on the other.
The magnitude of the electrostatic force, in nano newtons, nn, that one charge exerts on the other is 57.54 nN.
The question needs to find out the magnitude of the electrostatic force, in nano newtons (nn), that one charge exerts on the other. Let us understand the given data before starting the solution.
Given data:
Charge 1 (q1) = 6.96 nCCharge 2 (q2) = 3.86 nCDistance between charges (r) = 1.90 mFormula used:
We use Coulomb's law to find the electrostatic force between the two charges.
Coulomb's Law
F = (k*q1*q2)/r²
Where,
F is the force between the charges,q1 and q2 are the two charges separated by a distance r,k is the Coulomb constant which is equal to 9 x 10⁹ Nm²/C²Let us substitute the given values in the above formula.
F = (9 * 10⁹) * (6.96 * 10⁻⁹) * (3.86 * 10⁻⁹) / (1.90)²F = 57.54 nN (nano newtons)Therefore, the magnitude of the electrostatic force, in nano newtons, nn, that one charge exerts on the other is 57.54 nN.
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consider an ideal brayton cycle executed between the pressure limits of 1200 kpa and 100 kpa and temperature limits of 20 c and 1000 c with argon as the working fluid. the temperature at the exit of the compressor in celsius is
The temperature at the exit of the compressor is 1446.64 K or 1173.49 °C
The ideal Brayton cycle is executed between the pressure limits of 1200 kPa and 100 kPa and temperature limits of 20 °C and 1000 °C with argon as the working fluid.
The temperature at the exit of the compressor in Celsius is:
The Ideal Brayton cycle is a thermodynamic cycle that describes how to convert heat and pressure into work, and it has two reversible adiabatic processes and two reversible isobaric processes. A Brayton cycle is a cycle in which a gas turbine engine operates.In general, the Brayton cycle consists of the following four processes:
1) Adiabatic Compression
2) Constant Pressure Heating
3) Adiabatic Expansion
4) Constant Pressure Cooling
The temperature at the exit of the compressor in Celsius can be computed using the ideal gas equation.
Ideal gas law is given by
[tex]P V = n R T[/tex]
Where, P = Pressure
V = Volume
N = Number of moles of the gas
R = Universal gas constant
T = Temperature
At the exit of the compressor, the pressure is 1200 kPa and the temperature is 20 °C or 293 K.
[tex]P V = n R T_1[/tex]
[tex]T_1 = PV / nR[/tex]
Substituting the values, we get,
[tex]T_1[/tex] = 1200 × 10³ × 0.1 / (1 × 8.314) = 1446.64 K
The temperature at the exit of the compressor is 1446.64 K or 1173.49 °C.
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If you walk 10.0 m horizontally forward at a constant velocity carrying a 20 N object, the amount of work you do is A) more than 200 J. B) equal to 200J C) less than 200 J, but more than 0J D) zero.
If you walk 10.0 m horizontally forward at a constant velocity carrying a 20 N object, the amount of work you do is equal to 200J. Therefore, the correct option is B.
The work done by an object is given by the equation W = Fd cos θ. In this case, a person walks 10.0 m horizontally forward at a constant velocity while carrying a 20 N object. The amount of work they do can be calculated by using the above equation.
The work done can be found by multiplying force and displacement. However, the direction of the force and the displacement matters. The force and displacement should be in the same direction. This is known as the dot product of the force and displacement.
W = F.d cos θ
Where, W = Work done, F = force in the direction of displacement, d = displacement, and θ = angle between force and displacement
The force exerted by the person is 20 N, which is acting horizontally in the direction of displacement. Therefore, θ = 0°.
Cos 0° = 1
W = F.d.1
W = 20 N.10 m
W = 200 J
Therefore, the work done by the person is 200 J. So, the correct option is B) equal to 200 J.
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Identify which of the following forces act on the bicycle + rider system, and sort them accordingly Drag the appropriate items to their respective binsgravitynormal forcestatic fractionair resistancekinetic fractionrolling friction
The forces that act on the bicycle + rider system are Gravity, normal force, static friction, kinetic friction, air resistance, and rolling friction.
The force that pulls objects toward the center of a planet or another body is called gravity. All the planets are maintained in their orbits around the sun due to the force of gravity.
The force surfaces exert to prevent solid objects from passing through one another is known as the normal force.
When there is no relative motion between the object and the surface, a body is subject to a particular form of friction force known as static friction.
The forces that oppose the motion of an object as it travels through the air are known as air resistance.
A force called rolling friction opposes a rolling object's motion on a surface. Rolling resistance is another name for rolling friction.
Hence, Gravity, normal force, static friction, kinetic friction, air resistance, and rolling friction are the forces acting on the bicycle and rider system.
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emptying a half-full cylindrical tank suppose the water tank in exercise 36 is half full of water. determine the work required to empty the tank by pumping the water to a level 2 m above the top of the tank. answer
The work required to empty the cylindrical tank that is half full of water by pumping the water to a level 2 m above the top of the tank is 19695.61897 J.
To determine the work required to empty the cylindrical tank that is half full of water by pumping the water to a level 2m above the top of the tank, the following steps can be followed:
Find the volume of the water in the tank as follows:
V = (πr²h)/2, where V is the volume of water, r is the radius of the cylindrical tank, and h is the height of water in the tank.
Substituting the values given in the question,
V = (π × (0.8 m)² × 1 m)/2 = 1.00530965 m³
Now find the mass of the water as follows:-
The density of water = 1000 kg/m³
Mass = Density × Volume = 1000 kg/m³ × 1.00530965 m³ = 1005.30965 kg
Next, find the potential energy of the water:-
PE = m*g*h, where m is the mass of the water, g is the acceleration due to gravity, and h is the height of the water above the top of the tank.
Substituting the values given in the question,
PE = 1005.30965 kg × 9.81 m/s² × 2 m = 19695.61897 J
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A ________ is a descriptive research activity representing a small-scale investigation of 10 to 30 subjects that are representative of the main study's defined target population but focus on a specific subcomponent of the main study.
Multiple Choice
median
pretest
pilot test
pilot study
mode
A d.pilot study is a descriptive research activity representing a small-scale investigation of 10 to 30 subjects that are representative of the main study's defined target population but focus on a specific subcomponent of the main study.
A pilot study is a small-scale study that is usually carried out before the main study or trial to test if the intended study design, data collection method(s), measurement instruments, and data analysis techniques are feasible and sufficient. This is also done to ensure that data is collected in a way that minimizes the risk of error in the main study.
Mode, the most frequently occurring value in a data set is referred to as the mode. It is frequently utilized with categorical or nominal data. Pretest, before the test, a pretest is given to test subjects to establish a baseline for their knowledge or capability. Median, in statistics, the median is a measure of central tendency that is used to split a dataset into two equal parts. It is used with continuous or ordinal data.
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what is the difference between polarized and non polarized?
Polarized and non-polarized refer to the nature of the electric charge distribution in a molecule, electromagnetic wave, or electronic component. Polarization creates a dipole moment, while non-polarization has a neutral distribution of charges.
Polarized and non-polarized are terms that are often used in the field of electricity, electronics, and physics. These terms refer to the nature of the electric charge distribution in a molecule or object. Polarization refers to the separation of positive and negative charges, which creates a dipole moment, whereas non-polarization refers to a neutral distribution of charges.
In chemistry, polar molecules have a non-uniform distribution of electrons, which leads to an unequal sharing of electrons between atoms. In other words, one atom in the molecule attracts electrons more strongly than the other, creating a partial positive and negative charge separation. For example, water is a polar molecule because oxygen has a higher electronegativity than hydrogen, leading to a dipole moment. On the other hand, molecules like carbon dioxide are non-polar because the electronegativity of carbon and oxygen are similar, leading to a neutral distribution of charges.
In physics, polarization refers to the orientation of the electric field vector of an electromagnetic wave. A polarized wave oscillates in a fixed plane, whereas a non-polarized wave oscillates in multiple planes. Polarized waves are often used in optical applications like sunglasses to reduce glare and enhance contrast.
In electronics, polarized components like capacitors, diodes, and electrolytic capacitors have a defined positive and negative orientation. Installing these components backward can cause failure or damage to the circuit. Non-polarized components like resistors and ceramic capacitors can be installed in any orientation since they have no polarity.
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a 5.0-kg box is sitting on the floor and it will not move if the force is smaller than 39.0 n . part a what is the coefficient of static friction between the box and the floor?
The coefficient of static friction between the box and the floor is 0.78.
The coefficient of static friction is defined as the ratio of the frictional force acting on a body at rest to the normal force acting on it. It is denoted by the symbol 'μs'.
The equation for the coefficient of static friction is:
μs = Ff / FN
where, Ff = force of friction
FN = normal force
The given force applied to the box, F = 39.0 Nm
Weight of the box, W = 5.0 kg × 9.81 m/s² = 49.05 N
From the statement, it is given that the box will not move if the applied force is less than 39 N. This means that the maximum force of static friction, Fs = 39.0 Nm .Therefore, from the above values, we can find the coefficient of static friction as:
μs = Fs / FNμs = 39.0 N / 49.05 N
μs = 0.78
Hence, the coefficient of static friction between the box and the floor is 0.78.
The coefficient of static friction between the box and the floor can be determined by the equation Fs = μs × Fn,
where Fs is the static friction force, μs is the coefficient of static friction, and Fn is the normal force.
However, the coefficient of static friction between the box and the floor is 0.78.
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write an expression for the magnitude of the force, f, exerted on the firefighter by the pole. answer in terms of the variables from the problem statement as well as g for the acceleration due to gravity.
The expression for the magnitude of the force exerted on the firefighter by the pole can be expressed as F = mg + ma.
Where m is the mass of the firefighter,
g is the acceleration due to gravity, and
a is the acceleration of the pole
In order to find an expression for the magnitude of the force, F, exerted on the firefighter by the pole, we need to consider the forces acting on the firefighter.
According to Newton's second law of motion, the force acting on an object is equal to its mass multiplied by its acceleration. In this case, the forces acting on the firefighter are the gravitational force, which is pulling the firefighter downwards with a force of mg, and the force exerted on the firefighter by the pole, which is pushing the firefighter upwards with a force of ma. Therefore, the total force acting on the firefighter is given by the sum of these two forces, which is: F = mg + ma
Thus, this expression gives us the magnitude of the force exerted on the firefighter by the pole. Here, m is the mass of the firefighter, g is the acceleration due to gravity, and a is the acceleration of the pole. if the pole is not accelerating (i.e., if a = 0), then the expression reduces to F = mg, which is the gravitational force acting on the firefighter.
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a neutral metal sphere is touched to a negatively charged metal rod. As a result the sphere will be_____ and the metal rod will be ________ . Fill in the gaps
a. positively charger. b.negatively charger. c. neutral. d. none
A neutral metal sphere is touched to a negatively charged metal rod. As a result the sphere will be a. positively charged and the metal rod will be b. negatively charged.
When a neutral metal sphere is touched to a negatively charged metal rod, the sphere will be positively charged, and the metal rod will be negatively charged. The process of charging through contact is known as contact electrification, triboelectrification, or electrostatic induction. It occurs when two different materials come into contact and exchange electrons, causing one of them to become positively charged and the other to become negatively charged.
As a result, a neutral metal sphere is touched to a negatively charged metal rod, the negatively charged rod donates some of its electrons to the sphere, giving it a net positive charge. The metal sphere will repel positively charged objects and attract negatively charged objects due to the positive charge it has acquired. The negatively charged rod will repel negatively charged objects and attract positively charged objects due to the negative charge it has acquired. Hence, the correct option is a. positively charged and b. negatively charged.
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