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.

Question

Physics

Casey Chase

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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Answers (1)

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Leonard Haynes · Answer 1

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