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15 July, 15:57

A proposed electric vehicle makes use of storage batteries as its source of energy. Its mass is 1560 kg and it is powered by 20 batteries, each 11 V, 95A⋅h. Assume that the car is driven on level roads at an average speed of 55 km/h, and the average friction force is 250 N. Assume 100% efficiency and neglect energy used for acceleration. No energy is consumed when the vehicle is stopped, since the engine doesn't need to idle. Determine the horsepower required.

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  1. 15 July, 19:49
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    horse power is 5.1219 hp

    Explanation:

    Given data

    mass = 1560 kg

    batteries = 20

    power = 11 V

    current = 95A⋅h

    average speed = 55 km/h

    friction force = 250 N

    to find out

    the horsepower required

    solution

    we know that horse power formula that is

    power = force * speed ... 1

    here speed is 55 km/h = 55 * (1000/3600) = 15.28 m/s

    and force = 250 N

    put both these value in equation 1

    power = force * speed

    power = 250 * 15.28

    power = 3819.444 W = 3819.44 / 745.7) = 5.1219 hp

    so horse power is 5.1219 hp
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