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8 Energy – forces doing work

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Question 99
H

A motor has a constant input power of 500 W. The table shows the total useful energy transferred since it was switched on.

Time in sTotal useful energy in J
00
41000
103100

What is the efficiency of the motor between 4 s and 10 s?

[1]
A

0.420.420.42

B

0.700.700.70

C

0.620.620.62

D

1.031.031.03

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8 Energy – forces doing work Questions

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

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