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8 Energy – forces doing work

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Question 34

A motor rotates a theatre stage into position. An energy meter records the total energy supplied to the motor.

ReadingStartFinish
clock time14:27:3514:29:05
energy meter reading / kJ\mathrm{kJ}kJ318.4374.8

While the stage is rotating, 20.4 kJ of energy is dissipated into the thermal energy stores of the motor and the surroundings.

Calculate the mean useful power output of the motor.

[4]
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8 Energy – forces doing work Questions

  1. GCSE
  2. /Physics
  3. /8 Energy – forces doing work

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