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March 28, 2017

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A skier of mass 70.5 kg is pulled up a slope by a motor-driven cable. How much work is required to pull the skier 60 m up a 38° slope (assumed to be frictionless) at a constant speed of 2.0 m/s?

  • ap physics - ,

    The elevation gain is
    H = 60 sin38 = 36.9 m

    The energy required is the potential energy gain,
    E = M g H

    The speed does not matter, as long as it is constant. Kinetic energy stays the same.

  • ap physics - ,

    25521 J

  • ap physics - ,

    work=20,580J
    power=686 watts

  • ap physics - ,

    18081 J

  • ap physics - ,

    A skier of mass 61.0 kg is pulled up a slope by a motor-driven cable. (a) How much work is required to pull him 40.0 m up a 30.0° slope (assumed frictionless) at a constant speed of 4.00 m/s? (b) What power must a motor have to perform this task?

  • ap physics - ,

    skier of mass 79 kg is pulled up a slope by a motor-driven cable.
    (a) How much work is required to pull him 80 m up a 30° slope (assumed frictionless) at a constant speed of 3.4 m/s?
    1 J

    (b) What power (expressed in hp) must a motor have to perform this task?

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