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8 Energy – forces doing work

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Question 30

Measurements are taken from a parcel conveyor before and after it is serviced. Its efficiency is 0.50 before servicing and 0.80 after servicing. For equal amounts of energy supplied, the unwanted energy transfer after servicing is what percentage of the unwanted energy transfer before servicing?

[1]
A

40%40\%40%

B

160%160\%160%

C

30%30\%30%

D

62.5%62.5\%62.5%

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8 Energy – forces doing work Questions

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

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