Askier of mass 60 kg is pulled up a slope by a motor-driven cable. (a) how much work is required to pull him 75 m up a 30° slope (assumed frictionless) at a constant speed of 2.4 m/s? kj (b) what power (expressed in hp) must a motor have to perform this task?

Explanation:

Given

mass of skier=60 kg

distance traveled by skier=75 m

inclination

speed (v)=2.4 m/s

as the skier is moving up with a constant velocity therefore net force is zero

Force applied by cable

work done

(b)Power

kepler used the data from tycho blahe (his mentor) to construct the laws of planetary motion.