An automobile delivers 30.0 hp to its wheels when moving at a constant speed of 26.0 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) 1020 N
D) 861 N

Question

Quizplus · Accepted Answer

We can start by using the formula for power:
P = Fv

where P is power, F is force, and v is velocity.

Rearranging this formula to solve for force, we get:
F = P/v

Substituting the given values, we get:
F = (30.0 hp x 746 W/hp) / 26.0 m/s
F = 861 N

Therefore, the resistance force on the automobile at this speed is 861 N, which is answer choice D.

An Automobile Delivers 30