Physics – Cambridge AS Level: Work Energy and Power
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There are twenty questions in this quiz. Select the correct answer from the given choices.
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Question 1 of 20
1. Question
1 point(s)A conveyor belt is driven at velocity v by a motor. Sand drops vertically on to the belt at a rate of m kg s^{–1}.
What is the additional power needed to keep the conveyor belt moving at a steady speed when the sand starts to fall on it?CorrectIncorrectHint

Question 2 of 20
2. Question
1 point(s)A uniform solid block has weight 500 N, width 0.4 m and height 0.6 m. The block rests on the edge of a step of depth 0.8 m, as shown.
The block is knocked over the edge of the step and rotates through 90° before coming to rest with the 0.6 m edge horizontal. What is the change in gravitational potential energy of the block?CorrectIncorrectHint

Question 3 of 20
3. Question
1 point(s)The diagram shows a hydroelectric power station. The reservoir is linked to the turbines by a pipe of uniform crosssectional area.
Water flows from X to Y at constant speed. Which statement about the change of energy of the water as it moves from X to Y is correct?CorrectIncorrectHint

Question 4 of 20
4. Question
1 point(s)A fisherman lifts a fish of mass 250 g from rest through a vertical height of 1.8 m. The fish gains a speed of 1.1 m s^{–1}.
What is the energy gained by the fish?CorrectIncorrectHint

Question 5 of 20
5. Question
1 point(s)Water from a reservoir is fed to the turbine of a hydroelectric system at a rate of 500 kg s^{–1}. The reservoir is 300 m above the level of the turbine.
The electrical output from the generator driven by the turbine is 200 A at a potential difference of 6000 V. What is the efficiency of the system?CorrectIncorrectHint

Question 6 of 20
6. Question
1 point(s)The gas in an engine does work on a piston of crosssectional area 80 cm^{2}. The pressure on the piston has a constant value of 4.6 × 10^{5} Pa.
How much work is done by the gas on the piston when it moves through a distance of 25 cm?CorrectIncorrectHint

Question 7 of 20
7. Question
1 point(s)A loaded aeroplane has a total mass of 1.2 × 10^{5} kg while climbing after takeoff. It climbs at an angle of 23° to the horizontal with a speed of 50 m s^{–1}. What is the rate at which it is gaining potential energy at this time?
CorrectIncorrectHint

Question 8 of 20
8. Question
1 point(s)When a horizontal force F is applied to a frictionless trolley over a distance s, the kinetic energy of the trolley changes from 4.0 J to 8.0 J.
If a force of 2F is applied to the trolley over a distance of 2s, what will the original kinetic energy of 4.0 J become?CorrectIncorrectHint

Question 9 of 20
9. Question
1 point(s)Some gas in a cylinder is supplied with thermal energy q.
The gas does useful work in expanding at constant pressure p from volume V_{0} to volume V_{F}, as shown.
Which expression gives the efficiency of this change?CorrectIncorrectHint

Question 10 of 20
10. Question
1 point(s)The power P required to move an object through a medium at constant speed depends on the speed v and the resistive force F acting on the object.
The resistive force F also depends on the speed v. Which row shows a possible relationship between speed v, resistive force F and power P ?resistive force F power P A proportional to v constant B proportional to v proportional to v C proportional to v^{2} proportional to v^{2} D proportional to v^{2} proportional to v^{3} CorrectIncorrectHint

Question 11 of 20
11. Question
1 point(s)Which amount of energy is not 2400 J?
CorrectIncorrectHint

Question 12 of 20
12. Question
1 point(s)A hammer with 10 J of kinetic energy hits a nail and pushes it 5.0 mm into a plank.
Both the hammer and nail come to rest after the collision. What is the approximate average force that acts on the nail while it moves through 5.0 mm?CorrectIncorrectHint
<p>W=Fd</p>

Question 13 of 20
13. Question
1 point(s)A parachutist is falling at constant (terminal) velocity.
Which statement is not correct?CorrectIncorrectHint

Question 14 of 20
14. Question
1 point(s)A boy on a bicycle starts from rest and rolls down a hill inclined at 30° to the horizontal.
The boy and bicycle have a combined mass of 25 kg. There is a frictional force of 30 N, which is independent of the velocity of the bicycle. What is the kinetic energy of the boy and the bicycle after rolling 20 m down the slope?CorrectIncorrectHint

Question 15 of 20
15. Question
1 point(s)An escalator in an underground station has 250 people standing on it and is moving with a velocity of 4.3 m s^{–1}. The average mass of a person is 78 kg and the angle of the escalator to the horizontal is 40°.
What is the minimum power required to lift these people?CorrectIncorrectHint

Question 16 of 20
16. Question
1 point(s)An electric motor operating a lift has an output power of 20 kW.
The lift and passengers have a combined mass of 1500 kg. The motor raises the lift through a distance of 20 m. How long does it take?CorrectIncorrectHint

Question 17 of 20
17. Question
1 point(s)A bungee jumper jumps from a platform and is decelerated by an elastic bungee cord, as shown.
When the jumper makes the jump, his initial gravitational potential energy is converted into his kinetic energy and into elastic potential energy in the cord. At which part of the jump are all three types of energy nonzero?CorrectIncorrectHint

Question 18 of 20
18. Question
1 point(s)An object of mass 0.30 kg is thrown vertically upwards from the ground with an initial velocity of 8.0 m s^{–1}. The object reaches a maximum height of 1.9 m.
How much work is done against air resistance as the object rises to its maximum height?CorrectIncorrectHint
GPE=mgh, KE=1/2 mv^{2}

Question 19 of 20
19. Question
1 point(s)A racing car has an output power of 300 kW when travelling at a constant speed of 60 m s^{–1}.
What is the total resistive force acting on the car?CorrectIncorrectHint
P=Fv

Question 20 of 20
20. Question
1 point(s)The diagram shows the design of a water wheel which drives a generator to produce electrical power. The flow rate of the water is 200 kg s^{–1}. The generator supplies a current of 32 A at a voltage of 230 V.
Ignoring any changes in kinetic energy of the water, what is the efficiency of the system?CorrectIncorrectHint
P=IV