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college physics

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How many seconds would it take a 7.00hp motor to raise a 475 lb boiler to a platform 38.0 ft high?

  • college physics -

    Power = 7.0hp * 746W/hp = 5222 Watts =
    5222 Joules/s.

    Mass = 475Lbs * 0.454kg/Lb = 215.65 kg.=
    Mass of boiler.

    d = 38Ft./3.3Ft/m = 11.52 m.

    Work=F*d = mg * d=215.65*9.8 *11.52=
    24,346 Joules.

    t = 24346J * 1s/5222J = 4.66 s.

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