College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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A locomotive accelerates a 25-car train along a level track.
Every car has a mass of 5.0 * 104 kg and is subject to a frictional
force f = 250v, where the speed v is in meters per second and the
force f is in newtons. At the instant when the speed of the train is
30 km/h, the magnitude of its acceleration is 0.20 m/s2. (a) What
is the tension in the coupling between the first car and the
locomotive? (b) If this tension is equal to the maximum force the
locomotive can exert on the train, what is the steepest grade up
which the locomotive can pull the train at 30 km/h?
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- An elevator cab that weighs 22.2 kN moves upward. What is the tension in the cable if the cab's speed is (a) increasing at a rate of 1.08 m/s? and (b) decreasing at a rate of 1.08 m/s? (a) Number i Units (b) Number i Unitsarrow_forwardIn the figure, a block of mass m = 3.40 kg is pulled along a horizontal frictionless floor by a cord that exerts a force of magnitude F = 11.9 N at an angle θ = 29.0°. (a) What is the magnitude of the block's acceleration? (b) The force magnitude F is slowly increased. What is its value just before the block is lifted (completely) off the floor? (c) What is the magnitude of the block's acceleration just before it is lifted (completely) off the floor?arrow_forwardThe figure below shows an initially stationary block of mass m on a floor. A force of magnitude F = 0.510mg is then applied at upward angle 0 = 19°. (a) What is the magnitude of the acceleration of the block across the floor if the friction coefficients are us = 0.590 and uk = 0.505? m/s? (b) What is the magnitude of the acceleration of the block across the floor if the friction coefficients are ug = 0.395 and uk = 0.295? m/s2arrow_forward
- A block with mass mb=7.75 kg is suspended on a string. You pull upwards on the string creating a tension force of magnitude TYb=79.2275 N. If the upward speed of the block is 2.25 m/s right now, then what is its speed 5.5 s later?arrow_forwardYour answer is partially correct. A 60 kg crate is dragged across a floor by pulling on a rope attached to the crate and inclined 12° above the horizontal. (a) If the coefficient of static friction is 0.46, what minimum force magnitude is required from the rope to start the crate moving? (b) If Hk = 0.30, what is the magnitude of the initial acceleration (m/s^2) of the crate? %3D (a) Number i 276.52 Units (b) Number i 1.568 Units m/s^2arrow_forwardAn elevator cab that weighs 23.2 kN moves upward. What is the tension in the cable if the cab's speed is (a) increasing at a rate of 1.02 m/s? and (b) decreasing at a rate of 1.02 m/s?? (a) Number i Units (b) Number i Unitsarrow_forward
- A 20kg block is placed on a 30 degree ramp and an acceleration of 4.91m/s^2 is predicted if friction between the block and ramp is ignored. The actual measured acceleration is 3.49m/s^2. Find the Coefficient of friction between the block and the ramp.arrow_forwardA block with a mass of 2.0 kg is released from rest and slides down a long, smooth ramp. The incline of the ramp is 41.0 degrees, and the coefficient of kinetic friction is ?=0.259 How far will the block travel in 1.001.00 s, assuming it does not reach the end of the ramp?arrow_forwardA 17 kg block rests on a 32 degree inclined frictionless surface and is attached by a light string to a 34 kg hanging mass where the string passes over a massless frictionless pulley. If g = 9.8 m/s^2 what is the tension in the connecting string?arrow_forward
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