4. The goal of a worker is to slide a 20-kg crate up a 2.5 m-long inclined at 25º. The worker was confident that he can do this by giving it an initial speed of 4.5 m/s at the bottom and letting it go. However, the crate slides only 1.7 m up the ramp, stops, and slides back down. Find the magnitude of the friction force acting on the crate and its velocity when it reaches the bottom of the ramp again. |

4. The goal of a worker is to slide a 20-kg crate up a 2.5 m-long inclined at 25º. The worker was confident that he can do this by giving it an initial speed of 4.5 m/s at the bottom and letting it go. However, the crate slides only 1.7 m up the ramp, stops, and slides back down. Find the magnitude of the friction force acting on the crate and its velocity when it reaches the bottom of the ramp again. |

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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60.A 60.0-kg skier with an initial speed of 12.0 m/s coasts up a 2.50-m high rise as shown. Find her final speed at the top, given that the coefficient of friction between her skis and the snow is 0.80. K₁ 35° V₁ = ? 2.5 m
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previous problem: A small block slides down a frictionless track whose shape is described by y = (x^2) /d for x<0 and by y = -(x^2)/d for x>0. The value of d is 3.85 m, and x and y are measured in meters as usual. Suppose the block starts from rest on the track, at x = -1.99 m. What will the block s speed be when it reaches x = 0? New problem Same type of track as in the previous problem, this time with d = 4.73 m. The block starts at x = 0, and is given a push to the left with an initial speed of 7.57 m/s, so it starts sliding up the track to the left. At what value of x will the block reverse direction and start sliding back down? -3.72 m 3.72 m 2.92 m -2.92 m
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Your answer is partially correct. In the figure a block slides along a path that is without friction until the block reaches the section of length L = 0.66 m, which begins at height h = 1.1 m, on a ramp of angle 0 = 32°. In that section the coefficient of kinetic friction is 0.410. The block passes through point A with a speed of 8.4 m/s. If the block can reach point B (where the friction ends), what is its speed there, and if it cannot, what is its greatest height above A? Number i 8 6.46 Unit m/s
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