An electric motor has a power rating of 1.60 kW and operates at 75% efficiency. The amount of work that it can do in 1.0 hrs is__ x10^

Question

An electric motor has a power rating of 1.60 kW and operates at 75% efficiency. The amount of work that it can do in 1.0
hrs is__ x10^6J. Give your answer with the correct number of sig digs and do not include units)

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Vân Khánh 4 years 2021-08-20T09:24:54+00:00 1 Answers 8 views 0

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  1. thugiang
    0
    2021-08-20T09:26:52+00:00
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    Answer: 4.3 x 10^6 J

    Explanation: P= W/t so W=Pt.

    The power here is 1600 J/s (1.6 kW) and the time is 3600s (1 hour x 60 mins x 60 seconds).

    1600×3600 = 5760000 J (5.76 x 10^6 J).

    Efficiency = Eout/Ein so Eout = Efficiency x Ein.

    (0.75) x (5.76 x 10^6) = 4.3×10^6 J.

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