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**Physics Quiz**

**Work, Energy and Power**

varies depending on altitude

2. If energy loss is zero, then decrease in G.P.E is equal to

gain in kinetic energy

3. What is the average power of all activities of our body?

116W

4. What is energy that object possesses due to its position called?

potential energy

5. Change in G.P.E can be written as

mgh

6. Efficiency of a car engine is only about

20%

7. Work is defined as

F × S

8. How much energy is transferred to stone of weight 10 N falling from top of 250 m high cliff?

2500 J

9. How much work is done if force of 1 N moves an object through 1 m?

1 J

10. What are SI units for energy and work?

joules

11. If the ball is thrown upwards, the energy changings are

K.E changes to G.P.E

12. What is 1 W equal to?

s

s

^{-1}

1 J s

^{-1}

13. Work done by force of gravity on a satellite of 500 N at height is

0 J

14. What is the rate of doing work called?

power

15. A weight-lifter raises weights with a mass of 200 kg from the ground to a height of 1.5 m, the increase in their G.P.E is

2940 J

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