An automobile delivers 30.0 hp to its wheels when moving at a constant speed of 22.0 m/s.What is the resistance force on the automobile at this speed? (1 hp = 746 watts)
A)18 600 N
B)410 000 N
C)1 020 N
D)848 N

Question

Quizplus · Accepted Answer

The power delivered to the wheels is 30.0 hp, which is equivalent to 30.0 x 746 watts = 22,380 watts. Power is also equal to the force times velocity (P = Fv). Therefore, the resistance force can be calculated as F = P/v = 22,380 watts / 22.0 m/s = 1,020 N.

An Automobile Delivers 30