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8 Energy – forces doing work

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Question 7

During one drying session, a hair dryer transfers 54 kJ usefully and transfers 6.0 kJ to the surroundings in unwanted ways.

Calculate the efficiency of the hair dryer as a percentage.

[3]
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8 Energy – forces doing work Questions

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

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