Essential University Physics: Volume 1 (3rd Edition)
3rd Edition
ISBN: 9780321993724
Author: Richard Wolfson
Publisher: PEARSON
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Textbook Question
Chapter 5, Problem 49P
The coefficient of static friction between steel train wheels and steel rails is 0.58. The engineer of a train moving at 140 km/h spots a stalled car on the tracks 150 m ahead. If he applies the brakes so the wheels don’t slip, will the train stop in time?
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The brakes on a big truck fail and it is forced to use a runaway truck lane. The lane is perfectly horizontal, and full of deep gravel, creating a coefficient of kinetic friction between the truck and the gravel of 0.80. The truck enters the lane at moving 35 m/s (about 80 mph). How far does the truck travel before it stops?
A city is trying to determine the speed limit for a given stretch of road. If a stop sign is visible from 62.0m on a straight, horizontal stretch of road and the coefficient of static friction between the road and the tires of a car is 0.525 then what is the maximum speed for a car in meters per second so that it can come to a complete stop at the stop sign?
(a) A flatbed truck moving at 28 m/s carries a steel girder that rests on its wooden floor. The girder is not
strapped down, in violation with USDOT regulations. If the coefficient of static friction between steel and
wood is 0.52, what is the minimum distance over which the truck can come to a stop without the girder
sliding toward the cab of the truck? (answer: 77 m)
(b) What is the minimum time over which the truck can accelerate forward from 0 m/s to 28 m/s with a
constant acceleration without the girder sliding off the back? (answer: 5.5 s)
Chapter 5 Solutions
Essential University Physics: Volume 1 (3rd Edition)
Ch. 5.1 - A roofers toolbox rests on an essentially How does...Ch. 5.2 - In the figure below weve replaced one of the hands...Ch. 5.3 - You whirl a bucket of water around in a vertical...Ch. 5.4 - The figure shows a logging vehicle pulling a...Ch. 5 - Compare the net force on a heavy trunk when its...Ch. 5 - The force of static friction acts only between...Ch. 5 - A jet plane flies at constant speed in a vertical...Ch. 5 - In cross-country skiing, skis should easily glide...Ch. 5 - Why do airplanes bank when turning?Ch. 5 - Why is it easier for a child to stand nearer the...
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