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anonymous

  • one year ago

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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  1. anonymous
    • one year ago
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    @Michele_Laino :)

  2. Michele_Laino
    • one year ago
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    the requested potential energy change is equal to the work done by mover hoists

  3. rvc
    • one year ago
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    W=F X displacement

  4. anonymous
    • one year ago
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    so our solution is 200 J ? choice B?

  5. rvc
    • one year ago
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    W = 200 X 10

  6. anonymous
    • one year ago
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    oh! so 2000, choice C is our solution?

  7. Michele_Laino
    • one year ago
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    no, since 200 Kg is the mass of the piano. The work is: \[\Large W = 200 \times 9.81 \times 10 = ...Joules\]

  8. rvc
    • one year ago
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    yep need to convert

  9. anonymous
    • one year ago
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    oh so we get 19620? so choice D, 20,000 J is our solution?

  10. Michele_Laino
    • one year ago
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    correct!

  11. rvc
    • one year ago
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    yep

  12. anonymous
    • one year ago
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    yay!! thank you both!!

  13. Michele_Laino
    • one year ago
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    :)

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