Fundamentals of Physics, Volume 1, Chapter 1-20
10th Edition
ISBN: 9781118233764
Author: David Halliday
Publisher: WILEY
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Textbook Question
Chapter 6, Problem 75P
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 ƒ = 250v, where the speed v is in meters per second and the force ƒ 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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(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)
FNET = ma
fs,max = UsN
W =mg
v² = vo² + 2aAx
%3D
%3D
V = Vo+ at
g = 9.81 m/s?
(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)
FNET = ma
fs.max = μsn
W = mg
v² = v₁² + 2aAx
V = Vo+ at
g=9.81 m/s²
You are pushing a metal crate against a metal floor. The two surfaces have a static coefficient of friction of 0.62 and a kinetic coefficient of friction of 0.50. The floor is horizontal, and the crate has a mass of 25.0 kg. What is the minimum force you need to apply to get the crate moving from rest? Give your answer in units of N, to three significant figures.
Chapter 6 Solutions
Fundamentals of Physics, Volume 1, Chapter 1-20
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Now assume that Eq....Ch. 6 - Assume Eq. 6-14 gives the drag force on a pilot...Ch. 6 - Calculate the ratio of the drag force on a jet...Ch. 6 - In downhill speed skiing a skier is retarded by...Ch. 6 - A cat dozes on a stationary merry-go-round in an...Ch. 6 - Suppose the coefficient of static friction between...Ch. 6 - ILW What is the smallest radius of an unbanked...Ch. 6 - During an Olympic bobsled run, the Jamaican team...Ch. 6 - SSM ILW A student of weight 667 N rides a steadily...Ch. 6 - A police officer in hot pursuit drives her car...Ch. 6 - A circular-motion addict of mass 80 kg rides a...Ch. 6 - A roller-coaster car at an amusement park has a...Ch. 6 - GO In Fig. 6-39, a car is driven at constant speed...Ch. 6 - An 85.0 kg passenger is made to move along a...Ch. 6 - SSM WWW An airplane is flying in a horizontal...Ch. 6 - An amusement park ride consists of a car moving in...Ch. 6 - An old streetcar rounds a flat corner of radius...Ch. 6 - In designing circular rides for amusement parks,...Ch. 6 - A bolt is threaded onto one end of a thin...Ch. 6 - GO A banked circular highway curve is designed for...Ch. 6 - GO A puck of mass m = 1.50 kg slides in a circle...Ch. 6 - Brake or turn? 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