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28 September, 12:26

A 5.8 * 104-watt elevator motor can lift a total weight of 2.1 * 104 newtons with a maximum constant speed of

(1) 0.28 m/s

(2) 0.36 m/s

(3) 2.8 m/s

(4) 3.6 m/s

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Answers (1)
  1. 28 September, 13:18
    0
    Power is defined as the rate at which work is done upon an object. Like all rate quantities, power is a time-based quantity. Power is related to how fast a job is done. Two identical jobs or tasks can be done at different rates - one slowly or and one rapidly.

    P = Fv

    Where P is the power

    F is the weight

    V is the average velocity

    V = P/F

    V = (5.8 x 10^4 W) / (2.1 x 10^4 N)

    V = 2.8 m/s
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