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March 24, 2017

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How long will it take a 1920 W motor to lift a 285 kg piano to a sixth-story window 16.0 m above?

  • physics - ,

    Divide change in potential energy by the power of the motor.

  • physics - ,

    change in potential energy divided by the power. ( 1 W = 1 J/s)

    Initial potential energy= mass* g* height
    = mass * g*0
    = 0
    Final potential energy = mass* g* 16.0

    finf diffence between final and initial and divide by Power. Answer will be in seconds(s)

  • physics - ,

    3.945 secomds

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