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8 Energy – forces doing work

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Question 71
F

A motor has a useful power output of 120 W and an efficiency of 0.75. It operates for 30 s. What is the total energy supplied to the motor?

[1]
A

1200 J1200\ \mathrm{J}1200 J

B

4800 J4800\ \mathrm{J}4800 J

C

3600 J3600\ \mathrm{J}3600 J

D

2700 J2700\ \mathrm{J}2700 J

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8 Energy – forces doing work Questions

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

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