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3 Conservation of energy

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Question 9

During a rehearsal, an electric winch in a theatre raises the same piece of scenery through the same height six times. The winch is 80% efficient and transfers a total of 1440 J usefully during the six lifts.

How much energy is supplied to the winch for each lift?

[1]
A

1800 J1800\ \mathrm{J}1800 J

B

192 J192\ \mathrm{J}192 J

C

240 J240\ \mathrm{J}240 J

D

300 J300\ \mathrm{J}300 J

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3 Conservation of energy Questions

  1. GCSE
  2. /Physics
  3. /3 Conservation of energy

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