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anonymous

  • one year ago

A 70.0 kg sailor climbs a 28.3 m rope ladder at an angle of 45.0° with the mast. How much work did he do? A. 19,400 J B. 686 J C. 1,400 J D. 13,700 J :/

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  1. Michele_Laino
    • one year ago
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    the requested work W is: \[W = mgd\cos \left( {45} \right) = 70 \times 9.81 \times 28.3 \times \cos 45\]

  2. Michele_Laino
    • one year ago
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    since we havfe to consider the projection of the weight force, along the direction of the displacement

  3. Michele_Laino
    • one year ago
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    have*

  4. anonymous
    • one year ago
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    ohh okay! and so we calculate and get 13741? so our solution is D? 13,700 J since it is approximation?

  5. Michele_Laino
    • one year ago
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    yes!

  6. anonymous
    • one year ago
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    yay!! thank you!!

  7. Michele_Laino
    • one year ago
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    ok! :)

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