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3 Conservation of energy

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Question 16

An automatic sliding door is 80% efficient. Each time the door opens, 50 J of energy is dissipated.

How much of the energy supplied becomes the useful output?

[1]
A

200 J200\ \mathrm{J}200 J

B

62.5 J62.5\ \mathrm{J}62.5 J

C

40 J40\ \mathrm{J}40 J

D

250 J250\ \mathrm{J}250 J

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3 Conservation of energy Questions

  1. GCSE
  2. /Physics
  3. /3 Conservation of energy

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