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8 Energy – forces doing work

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Question 6

An automatic sliding door takes 8.0 s to open. Its mean useful power output is 250 W and 400 J of energy is dissipated while it opens. What is the mean input power of the door?

[1]
A

250 W250\ \mathrm{W}250 W

B

650 W650\ \mathrm{W}650 W

C

200 W200\ \mathrm{W}200 W

D

300 W300\ \mathrm{W}300 W

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8 Energy – forces doing work Questions

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

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