*•26 00 Figure 6-32 shows three crates being pushed over a concrete floor by a horizontal force F of magnitude 440 N. The masses of the crates are m, = 30.0 kg, m2 = 10.0 kg, and m3 = 20.0 kg. The coeffi- cient of kinetic friction between the floor and each of the crates is 0.700. (a) What is the magnitude F of the force on crate 3 from crate 2? (b) If the crates then slide onto a polished floor, where the coefficient of kinetic friction is less than 0.700, is magni- tude F more than, less than, or the same as it was when the coefficient was 0.700? Fig. 6-31 Problem 25. %3D Flg. 6-32 Problem 26. Frictionless, massless pulley

*•26 00 Figure 6-32 shows three crates being pushed over a concrete floor by a horizontal force F of magnitude 440 N. The masses of the crates are m, = 30.0 kg, m2 = 10.0 kg, and m3 = 20.0 kg. The coeffi- cient of kinetic friction between the floor and each of the crates is 0.700. (a) What is the magnitude F of the force on crate 3 from crate 2? (b) If the crates then slide onto a polished floor, where the coefficient of kinetic friction is less than 0.700, is magni- tude F more than, less than, or the same as it was when the coefficient was 0.700? Fig. 6-31 Problem 25. %3D Flg. 6-32 Problem 26. Frictionless, massless pulley

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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Two students are pushing crates across a frictionless floor. The crates are initially at rest. Bing applies a horizontal force of 13 N to his crate. Bob, who is taller than Bing, pushes on his crate at an angle of 53 degrees below the horizontal, also with a force of 13 N. Find the ratio of the masses of the two crates if Bing's crate is moving at twice the speed of Bob's crate after they have traveled a distance of 23.5 m across the floor?
A person steps horizontally off the roof of a single-story house that is 3.1 m high. When his feet hit theground below, he bends his knees such that his torso decelerates over a distance of 0.65 m before coming to astop. If the mass of his torso is 50 kg, what is the average net force exerted on his torso over this distance?
A package is projected 10 m upward on a 15 ° inclined plane so that it reaches the top of the plane with zero velocity. Knowing that the coefficient of kinetic friction between the package and the incline is 0.15, determine the speed of the package when it returns to its original position.
WE-4 A 3.00kg block is initially sliding to the right on P (N) 20 a frictionless surface at 7.00m/s. Force P is directed to the left and is applied to the block continuously starting at the initial position as shown below. The magnitude of P varies as shown in the graph to the right. V=7.00m/s 15 10 5. 0 1 2 3 4 (m) a) Find the magnitude of the work done by the force P as the block moves from x-0 to x=4m. b) Find the kinetic encrgy of the block at x-4m. Neglect air resistance (and the surface is frictionless). c) Find the speed of the block at x-4m. P Type here to search %23 直

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The force P is applied to (a) the 79-lb block and (b) the 124-Ib block. For each case, determine the magnitude of P required to initiate motion. H = 0.37 79 lb Р (а) H = 0.20 124 lb --->P (b) Answers: (a) P = i Ib (b) P = i Ib
The man slides the 180-lb crate across the floor by pulling with a constant force of 30 lb. If the crate was initially at rest, how far will the crate move before its speed is 4.0 ft/s? The coefficient of kinetic friction between the crate and the floor is 0.15.
To avoid a collision while traveling at a speed of 19 m/sec and descending a steep mountain pass with a grade of 4.3%, a truck locks up all wheels and skids to a stop over a distance of 90 meters. Determine the coefficient of friction between the truck tires and pavement.
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An ice hockey puck is sliding over a frictionless horizontal surface with a constant velocity of vo = 10.2 m/s. Find the velocity of the puck after it passes a rough area of length L 6 m and with the kinetic friction coefficient u = 0.33 as shown below. Hint: the mass of the puck is not needed, you can either calculate everything per unit of mass or, if it helps, take m 160 grams. %3D %3D %3D %3D m Vo L The steps to follow: (1) find the initial KE of the puck; (2) find the work done by the friction force (should be negative); (3) find the final kinetic energy as KE; = KE; + W, meaning that some of the initial kinetic energy is lost due to the work done by friction; (4) from the final KE find the final speed. The final speed of the puck, Vf =7.28 X Units m/s %3D If the initial speed of the puck is not high enough the puck will get stuck in the rough area. At what minimal initial speed should the puck move to barely make it through the rough area? The minimal initial velocity, Vmin =…
4.35 •• Two adults and a child want to push a wheeled cart in the direc- tion marked x in Fig. P4.35 (next page). The two adults push with hori- zontal forces É and F, as shown. (a) Find the magnitude and direction of the smallest force that the child should exert. Ignore the effects of friction. (b) If the child exerts the minimum force found in part (a), the cart ac- celerates at 2.0 m/s- in the +x-direction. What is the weight of the cart?