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15 April, 14:56

What is the maximum distance that a 60.-watt motor may vertically lift a 90.-newton? weight in 7.5 seconds? a. 2.3mb. 5.0mc. 140md. 1100m

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  1. 15 April, 17:38
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    b. 5.0 m

    Explanation:

    Power: Power can be defined as the rate at which work is done.

    The S. I unit of power is watt (W).

    P = W/t ... Equation 1

    Where p = power, W = work, t = time.

    But

    W = F*d ... Equation 2

    Where F = force, d = maximum distance.

    Substituting equation 2 into equation 1

    P = F*d/t

    making d the subject of the equation above,

    d = Pt/F ... Equation 3

    Given: F = 90 Newton, P = 60 watt, t = 7.5 seconds.

    Substituting these values into equation 3,

    d = 60*7.5/90

    d = 5 m

    Thus the maximum distance is = 5 m

    The right option is b. 5.0 m
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