anonymous
  • anonymous
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
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
@Michele_Laino :)
Michele_Laino
  • Michele_Laino
the requested potential energy change is equal to the work done by mover hoists
rvc
  • rvc
W=F X displacement

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

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