A skier starts from rest at the top of a hill that is inclined at 9.5° with respect to the horizontal. The hillside is 195 m long, and the coefficient of friction between snow and skis is 0.0750. At the bottomof the hill, the snow is level and the coefficient of friction is unchanged. How far does the skier glide along the horizontal portion of the snow before coming to rest?

When we use force to move a body from rest, there is a point beyond which the body resists movement.…

Answered: skier starts from rest at the top of a…

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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m A person is pushing a wooden crate of mass mo = 20 kg at a constant speed vo = 1.2– for Ax = 3 m along a rough horizontal floor that has a coefficient of friction µk = .4.
As a van climbs a 35 ° slope at 60 m/s, its driver falls ill and takes his foot off the accelerator pedal. The van stops after 75 m. Since the ill driver cannot use the foot brake and hand brake, the truck starts to move downhill after a moment's stop. After the van slides 40 meters downhill, the driver begins to brake. Since the braking force is 0.5W (W = weight); a- What is the kinetic friction coefficient between the road and the van? b- Calculate the total time it takes until the van comes to the point where the driver got sick while going down the hill. 35°
Problem 2: Peter pushed a 84 kg box down a sloping metal surface with a push force of 50 N. The slope angle o= 16°. The kinetic friction coefficient between the box and the sloping metal surface was u=0.34.
A ski 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 230 m slope in the Alps, a skier reduced his top-to-bottom time from 69 s with standard skis to 42 s with the new skis. Old skis acceleration = 0.097 m/s2 New skis acceleration = 0.26 m/s2 Assuming a 3.0° slope, compute the coefficient of kinetic friction for each case. Old skis _______ New skis _______
A rock rests on a horizontal plane. The plane is slowly tilted so that the angle between the surface and the horizontal increases to 20 degrees, at which point the rock is about to slip. What is the coefficient of static friction between the rock and the surface, to two significant figures? O 0.36 2.2 3.4 9.4 O 13 O
4
Two crates of fruit are released from the top of a ramp inclined at 30 degrees from the horizontal and 4.5 meter long. The two crates consist of an apple crate of mass 20 kg that is placed in front of a watermelon crate of mass 80 kg. The apple crate has a coefficient of friction of 0.20 while the watermelon crate has a coefficient of friction of 0.15. How long does it take the apple crate to reach the bottom of the incline if it needs to travel a distance of 4.5 meters?
BLOCK A WITH WEIGHT EQUAL TO 100 N, RESTS ON BLOCK B OF NEGLIGIBLE WEIGHT. THE COEFFICIENT OF STATIC FRICTION Hs IS THE SAME AT BOTH SURFACES OF THE BLOCKS, AND THE FRICTION BETWEEN BLOCK A AND THE VERTICAL WALL MAY BE NEGLECTED. FOR P = 50 N, DETERMINE THE VALUE OF Hs FOR WHICH MOTION IS IMPENDING. W = 100 N A 15° f В P = 50 N
A hockey puck (mass = 2 kg) leaves the players stick with a speed of 20 m/s and slides on the ice before coming to rest.The coefficient of friction between the puck and the ice is 0.9. How far will the puck slide after leaving the players stick? m
A man is driving his car with speed 49.0 mi/h on a horizontal stretch of road. (a) When the road is wet, the coefficient of static friction between the road and the tires is 0.102. Find the minimum stopping distance (in m). m == (b) When the road is dry, H, = 0.598. Find the minimum stopping distance (in m). m
A 10.1 kg box is released on a 49.9° incline and accelerates down the incline at 0.07 m/s². What is the coefficient of kinetic friction between the two surfaces?

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