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anonymous

  • one year ago

A sailor pulls a boat horizontally alongside a dock for 10.0 m with a rope angled at 40.0°. He uses a force of 100.0 N. How much work did he do on the boat? A. 766 J B. 643 J C. 1.00 * 10^3 J D. 4.00 * 10^4 J

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  1. Michele_Laino
    • one year ago
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    here is the situation described in your problem: |dw:1433096507947:dw|

  2. anonymous
    • one year ago
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    yes:)

  3. Michele_Laino
    • one year ago
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    now, we have to apply this formula:

  4. anonymous
    • one year ago
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    which formula?

  5. Michele_Laino
    • one year ago
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    \[W = Fd\cos \left( {40} \right) = 100 \times 10 \times \cos 40\]

  6. anonymous
    • one year ago
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    766.0444 so about 766 J is our answer?

  7. Michele_Laino
    • one year ago
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    yes! That's right!

  8. anonymous
    • one year ago
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    yay!! :D

  9. Michele_Laino
    • one year ago
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    :D

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