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3.2 Dissipation and efficiency

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Question 47
H

A machine receives 1000 J and transfers 500 J usefully per operation.

A redesign reduces the energy dissipated by air resistance by 80 J, but increases the energy dissipated by friction by 30 J. All other unwanted transfers and the input energy are unchanged.

What is the efficiency after the redesign?

[1]
A

45%45\%45%

B

55%55\%55%

C

58%58\%58%

D

61%61\%61%

Markscheme

3.2 Dissipation and efficiency Questions

  1. GCSE
  2. /Physics
  3. /3.2 Dissipation and efficiency

100 exam-style questions on Edexcel GCSE Physics 3.2 Dissipation and efficiency, covering 3.2.1 Dissipation of energy, 3.2.2 Reducing unwanted energy transfers, 3.2.3 Efficiency, and 3.2.4 Increasing efficiency. Each one has a worked solution and a mark scheme showing where the marks go.

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