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8 Energy – forces doing work

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Question 60
F

A machine receives 900 J of energy. It dissipates 180 J by heating and 45 J by sound. All the remaining energy is transferred usefully. What is its efficiency?

[1]
A

0.750.750.75

B

0.050.050.05

C

0.250.250.25

D

0.200.200.20

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8 Energy – forces doing work Questions

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

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