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?

The protons in a nucleus are approximately 2 ✕ 10^−15 m apart. consider the case where the protons are a distance d = 1.93 ✕ 10^−15 m apart. calculate the magnitude of the electric force (in n) between two protons at this distance.

(8%) problem 12. a bowling ball of mass mb 3 kg 's rolled down the lane with a velocity ofy-2/ m s lt strikes a single remaining pin mp 0.93 kg head on. after the collision the bowling ball has a velocity (in the same direction) of v2 1.1 m/s. = ▲ 33% part (a) write an expression for the velocity of pin in the horizontal direction after the impact, im ,, 33% part (b) what is the pins speed in ms? 33% part (c) assuming the coefficient of friction s μ,-0.1. how far in meters could the pin slide before stopping if it doesn't topple?

Which of the following best describes the shape of earth's orbit? a. ellipticalb. circularc. spirald. figure eight