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Answer the following questions based on work & energy.

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Multiple choice

1.

If an engine does 756 J of work in 9 seconds, its average power is
 747 W 765 W 6804 W 84 W

Half-n-half Clue

2.

A pebble is dropped from the top of a cliff 84 m in height. The kinetic energy of the pebble equals twice its potential energy at a distance of _______ above sea level.
 21 m 28 m 42 m 63 m

Half-n-half Clue

3.

A machine that produces 128 J of work by using 160 J of energy has an efficiency of
 80 % 32 J 16 J 20 %

Half-n-half Clue

4.

Both work and heat are measured in Joules.
 True False

5.

A body loses 3430 J of potential energy in falling through 70 m. If the gravitational acceleration is 9.8 m s-2, then the body has a mass of
 350 kg 49 kg 5 kg 686 kg

Half-n-half Clue

6.

The maximum amount of work that can be done by a 50 kW machine in 12 seconds is
 4 J 600 J 4 kJ 600 kJ

Half-n-half Clue

7.

Power is the rate of doing work.
 True False 36 more pages in School Physics Quiz