A mover hoists a 200 kg piano from the ground to a height of 10 m using a single pulley. What was the change in the piano's energy? A. 20 J B. 200 J C. 2,000 J D. 20,000 J

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A mover hoists a 200 kg piano from the ground to a height of 10 m using a single pulley. What was the change in the piano's energy? A. 20 J B. 200 J C. 2,000 J D. 20,000 J

Physics
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the requested potential energy change is equal to the work done by mover hoists
  • rvc
W=F X displacement

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Other answers:

so our solution is 200 J ? choice B?
  • rvc
W = 200 X 10
oh! so 2000, choice C is our solution?
no, since 200 Kg is the mass of the piano. The work is: \[\Large W = 200 \times 9.81 \times 10 = ...Joules\]
  • rvc
yep need to convert
oh so we get 19620? so choice D, 20,000 J is our solution?
correct!
  • rvc
yep
yay!! thank you both!!
:)

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