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8 Energy – forces doing work

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Question 50

During a 30 s pressing operation, a recycling compactor has a useful power output of 420 W. The efficiency of the compactor is 70%. How much energy is supplied to the compactor during this operation?

[1]
A

8820 J8820\ \mathrm{J}8820 J

B

600 J600\ \mathrm{J}600 J

C

180 J180\ \mathrm{J}180 J

D

18 000 J18\,000\ \mathrm{J}18000 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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