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3 Conservation of energy

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Question 114
H

A lifting system receives 1200 J per operation. Its motor transfers 75% of this energy to the lifting mechanism. The mechanism dissipates 300 J and transfers the rest usefully.

A new mechanism dissipates 120 J per operation. The motor and its input energy are unchanged.

What is the new overall efficiency of the lifting system?

[1]
A

50%50\%50%

B

75%75\%75%

C

65%65\%65%

D

87%87\%87%

Markscheme

3 Conservation of energy Questions

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

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