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8 Energy – forces doing work

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Question 17

In one use, an electric sander transfers 600 J of energy usefully. In the same time, 300 J heats the motor and the surrounding air, and 100 J is transferred to the surroundings as sound. What is the efficiency of the sander?

[1]

A

$0.60$

B

$0.86$

C

$0.67$

D

$0.40$

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8 Energy – forces doing work Questions

GCSE
Physics
8 Energy – forces doing work

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