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4 February, 21:53

A car with a mass of 1.50x10^3 kg starts from rest and accelerates to a speed of 18.0m/s in 12.0 s. assume that the force of resistance remains constant 400.0n during this time. what is the average power developed by the car's engine.

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  1. 4 February, 23:01
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    The first thing you should know for this case is the definition of distance.

    d = v * t

    Where,

    v = speed

    t = time

    We have then:

    d = v * t

    d = 9 * 12 = 108 m

    The kinetic energy is:

    K = ½mv²

    Where,

    m: mass

    v: speed

    K = ½ * 1500 * (18) ² = 2.43 * 10 ^ 5 J

    The work due to friction is

    w = F * d

    Where,

    F = Force

    d = distance:

    w = 400 * 108 = 4.32 * 10 ^ 4

    The power will be:

    P = (K + work) / t

    Where,

    t: time

    P = 2.86 * 10 ^ 5/12 = 23.9 kW

    answer:

    the average power developed by the engine is 23.9 kW
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