# Question: A sleigh and driver with a total mass of 120

A sleigh and driver with a total mass of 120 kg are pulled up a hill with a incline by a horse, as illustrated in Fig. 5.36.

(a) If the overall retarding frictional force is 950 N and the sled moves up the hill with a constant velocity of 5.0 km/h, what is the power output of the horse? (Express in horsepower, of course. Note the magnitude of your answer, and explain.)

(b) Suppose that in a spurt of energy, the horse accelerates the sled uniformly from 5.0 km/h to 20 km/h in 5.0 s. What is the horse’s maximum instantaneous power output? Assume the same force of friction.

(a) If the overall retarding frictional force is 950 N and the sled moves up the hill with a constant velocity of 5.0 km/h, what is the power output of the horse? (Express in horsepower, of course. Note the magnitude of your answer, and explain.)

(b) Suppose that in a spurt of energy, the horse accelerates the sled uniformly from 5.0 km/h to 20 km/h in 5.0 s. What is the horse’s maximum instantaneous power output? Assume the same force of friction.

## Relevant Questions

A construction hoist exerts an upward force of 500 N on an object with a mass of 50 kg. If the hoist started from rest, determine the power it expended to lift the object vertically for 10 s under these conditions. A winch is capable of hauling a ton of bricks vertically two stories (6.25 m) in 19.5 s. If the winch’s motor is rated at 5.00 hp, determine its efficiency during raising the load. Automobiles used to have firm steel bumpers for safety. Today auto bumpers are made out of materials that crumple or collapse on sufficient impact. Why is this? In the Revolutionary War, the Americans had an advantage in using long rifles, instead of the smooth bore muskets used by the British. The long rifle had a barrel of 48 in. or more, whereas the musket barrel length was on ...A major league catcher catches a fastball moving at 95.0 mi/h and his hand and glove recoil 10.0 cm in bringing the ball to rest. If it took 0.00470 s to bring the ball (with a mass of 250 g) to rest in the glove, (a) What ...Post your question