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21 November, 21:12

an electric motor lifts an elevator that weighs 1200N a distance of 9m in 15s, what is the power of the motor in watts?

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  1. 21 November, 21:30
    0
    720 W

    Explanation:

    First let us find the work done of lifting the elevator. The work done can be calculated using the formula WD = F * d where F is the magnitude of force in N and d is the parallel distance moved in m. Hence,

    WD = (1200) (9)

    = 10 800 J

    Power is the rate of work done with the formula P = E/t where E is the work done in J and t is the time in s. Hence,

    Power of motor = 10 800 / 15

    = 720 W
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