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8 Energy – forces doing work

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Question 40

During a cleaning task, an electric floor polisher is supplied with 9000 J of energy. Its efficiency is 0.60 and its useful power output is 180 W. For how long does the floor polisher operate?

[1]
A

20 s20\ \mathrm{s}20 s

B

50 s50\ \mathrm{s}50 s

C

30 s30\ \mathrm{s}30 s

D

83 s83\ \mathrm{s}83 s

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8 Energy – forces doing work Questions

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

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