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March 27, 2017

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find the work done in winding up a 175 ft cable that weighs 4.00 lb/ft?

  • calculus - ,

    Assuming the whole cable is just hanging there, the work required to raise it up is

    ∫(175-x)(4dx)[0,175]
    = 4(175x - .5x^2)[0,175]
    = 700x - 2x^2[0,175]
    = [700*175 - 2*175^2] - [0-0]
    = 61250

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