Question

A race car with a 255 hp (1.90 × 105 W) engine is able to accelerate from rest to its top speed in 9.00 s. How much work does the car's engine do in this interval of time?

Answer 1

Answer:

W = 1710 kJ

Explanation:

Given that,

Power of a race car, P = 255 hP = $1.9\times 10^5\ W$

It accelerate from rest to its top speed in 9.00 s.

We need to find the work does the car's engine do in this interval of time.

Power is given by work done per unit time. Mathematically,

$P=\dfrac{W}{t}\\\\W=P\times t\\\\W=1.9\times 10^5\times 9\\\\W=1710\ kJ$

So, the required work done is is 1710 kJ.