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6 December, 19:57

A 100100 -watt [W] motor (6060 % efficient) is available to raise a load 1010 meters [m] into the air. If the task takes 8080 seconds [s] to complete, how heavy was the load in units of kilograms [kg]?

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  1. 6 December, 20:57
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    m = 48.93kg

    The load is 48.93kg.

    Explanation:

    Given;

    Power P = 100watts

    Efficiency e = 60% = 0.60

    distance d = 10 m

    time taken t = 80 s

    Acceleration due to gravity g = 9.81m/s

    Workdone W can be expressed as;

    W = ePt = Fd = mgd

    ePt = mgd

    Making m the subject of formula;

    m = ePt/gd

    Substituting the values;

    m = (0.60*100*80) / (9.81*10)

    m = 48.93kg

    The load is 48.93kg.
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