Answer to Question #253939 in Mechanics | Relativity for Kristine

Question

What weights can a 6 Hp engine pulls along a level road at 15 mi/hr if

the coefficient of friction between the weight and the road is 0.2?

Answer 1

6 HP is 4474 W. 15 mi/hr is 6.7 m/s.

Find the net force developed by the engine:

$$F=P/v=668\text{ N}.$$

This force is equal to the force of friction:

$$F=\mu W,\\\space\\ W=F/\mu=3339\text{ N, or 340 kg, or 728 lbs}.$$