Aski that is placed on snow will stick to the snow. however, when the ski is moved along the snow, the rubbing warms and partially melts the snow, reducing the coefficient of friction and promoting sliding. waxing the ski makes it water repellent and reduces friction with the resulting layer of water. a magazine reports that a new type of plastic ski is especially water repellent and that, on a gentle 200 m slope in the alps, a skier reduced his top-to-bottom time from 47.94 s with standard skis to 33.94 s with the new skis. determine the magnitudes of his average acceleration with each pair of skis. acceleration with old model ski? acceleration with new model ski? assuming a 4.0° slope, compute the coefficient of kinetic friction for each case. old model ski coefficient of friction? new model ski coefficient of friction?

In which scenario is the least amount of work done on a crate? a force of 120 n moves it 25 m. a force of 115 n moves it 26 m. a force of 130 n moves it 22 m. a force of 125 n moves it 27 m.

We put a force of 50n on an object and the acceleration is 100 m/s². what is the mass of the object?

An charge with mass m and charge q is emitted from the origin, (x,y)=(0,0). a large, flat screen is located at x=l. there is a target on the screen at y position y(h), where y(h) > 0. in this problem, you will examine two different ways that the charge might hit the target. ignore gravity in this problem. 1.assume that the charge is emitted with velocity v(0) in the positive x direction. between the origin and the screen, the charge travels through a constant electric field pointing in the positive y direction. what should the magnitude e of the electric field be if the charge is to hit the target on the screen? express your answer in terms of m, q, y(h), v(0), and l. 2.now assume that the charge is emitted with velocity v(0) in the positive y direction. between the origin and the screen, the charge travels through a constant electric field pointing in the positive x direction. what should the magnitude e of the electric field be if the charge is to hit the target on the screen? express your answer in terms of m, q, y(h), v(0), and l.