Question

An aerodynamic 1,000 kg car takes about 270 newtons of force to maintain a speed of 25 m/s. how much horsepower is required from the engine to maintain this speed?

Answer 1

Given:

Power = Force*velocity
= 270*25 watts
1 hp =746 watts
therefore power= 270*25/746 horsepower
=9.048 hp

Answer 2

9.05 horsepower required from the car engine to maintain the speed.

Given:

Weight of the aerodynamic car = 1000 kg

Force of the car = 270 newtons

Speed of the car $=25\ \mathrm{m} / \mathrm{s}$

To find:

Horsepower required from the car engine to maintain the speed

Solution:

Power $=\text { Force of the car } \times \text { Speed of the car }$

$=270 \times 25=6750\ watts$

By formula, 1 watt = 0.001341  

Hence 6750 watts $=6750 \times 0.001341=9.05\ horsepower$.