An electric motor does 900j of work for 8 hours. Calculate the power used​

Question

An electric motor does 900j of work for 8 hours. Calculate the power used​

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Ngọc Diệp 5 months 2021-08-15T15:24:52+00:00 1 Answers 5 views 0

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    2021-08-15T15:26:04+00:00

    Answer:

    0.031 W

    Explanation:

    The power used is equal to the rate of work done:

    P=\frac{W}{t}

    where

    P is the power

    W is the work done

    t is the time taken to do the work W

    In this problem, we have:

    W = 900 J is the work done by the motor

    t = 8 h is the time taken

    We have to convert the time into SI units; keeping in mind that

    1 hour = 3600 s

    We have

    t=8\cdot 3600 =28,800 s

    And therefore, the power used is

    W=\frac{900}{28800}=0.031 W

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