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27 January, 01:48

Power lifter Paul lifts a 700.0kg barbell 2.00m in 0.400s. How much power did Paul develop?

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Answers (2)
  1. 27 January, 04:58
    0
    34,335 W

    P = mgh/t

    P=700*2*9.81/.4
  2. 27 January, 05:32
    0
    Work = (force) x (distance.

    The force required to lift the load is its weight.

    Weight = (mass) x (gravity)

    so Work = (mass) x (gravity) x (distance)

    Now Power = (work) / (time)

    so Power = (mass) x (gravity) x (distance) / (time)

    = (700kg) x (9.8 m/s²) x (2 m) / (0.4 sec)

    = (700 x 9.8 x 2) / (0.4) (kg-m²/sec²) / (sec)

    = (34,300) (joule) / (sec)

    = 34,300 watts.

    This is one of those exercises where the math and the physics

    are air-tight and bullet-proof but the answer is absurd.

    34,300 watts is about 46 horsepower. I don't care how many

    Wheaties Power Lifter Paul had for breakfast today, he is NOT

    snatching a barbell that weighs 1,543 pounds (0.77 ton!)

    to the height of the top of his head in less than 1/2 second!
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