College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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Textbook Question
Chapter 7, Problem 55AP
A car moves at speed v across a bridge made in the shape of a circular arc of radius r. (a) Find an expression for the normal force acting on the car when it is at the top of the arc. (b) At what minimum speed will the normal force become zero (causing the occupants of the car to seem weightless) if r = 30.0 m?
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A roller-coaster car at an amusement park has a mass of 1200 kg when fully loaded with passengers. As the car passes over the top of a circular hill of radius 18 m, assume that its speed is not changing. At the top of the hill, what are the (a) magnitude FN and (b) direction (up or down) of the normal force on the car from the track if the car’s speed is v = 11 m/s? What are (c) FN and (d) the direction if v =14 m/s?
A small car with mass 0.8kg travels uniformly at 12 m/s on the inside of a track that is a vertical circle (with r=5m). If the magnitude of the normal force exerted by the track on the car when it is on the top of the track is 6N, what is the magnitude of the normal force on the car when it is on the bottom of the track?
A roller-coaster car has a mass of 1000 kg when fully loaded with passengers. As the car passes over the top of a circular hill of radius
23 m, its speed is not changing. (a) At the top of the hill, what is the normal force (using the negative sign for the downward direction)
FN on the car from the track if the car's speed is v = 7.8 m/s? (b) What is FN if v = 20 m/s? Use g=9.81 m/s?.
(a) Number
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(b) Number
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Chapter 7 Solutions
College Physics
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