Physics for Scientists and Engineers
6th Edition
ISBN: 9781429281843
Author: Tipler
Publisher: MAC HIGHER
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Chapter 12, Problem 65P
To determine
The minimum coefficient of friction.
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One and of a uniform 3.30-m-long rod of weight w is supported by a cable at an angle of 8-37 with the rod. The other end rests against a wall, where it is held by friction (see figure). The
coefficient of static friction between the wait and the rod is ,-0.525. Determine the minimum distance from point A at which an additional weight w (the same as the weight of the rod) can
be hung without causing the rod to slip at point A
275
x
Your response differs from the correct answer by more than 10% Double check your calculations, m
Subnd Arower
A uniform ladder of length L and weight w is leaning against avertical wall. The coefficient of static friction between the ladderand the floor is the same as that between the ladder andthe wall. If this coefficient of static friction is μs = 0.500, determinethe smallest angle the ladder can make with the floorwithout slipping.
A 10 m long ladder with mass of 20 kg rests against a smooth wall at height of 8 m at an
inclination a to the rough ground floor. Assuming that there is no friction between the wall
and the ladder, but there is a frictional force between the floor and the ladder.
(a)
Determine the minimum static coefficient of friction, 4 between the floor and the
ladder for which equilibrium is possible.
(b)
A worker of mass 80 kg climbs up the ladder. Determine how far the worker may go
up before the ladder starts to slip.
(c)
By comparing between frictional force of floor and wall, determine whether a
worker can climb safely to the top of the ladder or not.
Chapter 12 Solutions
Physics for Scientists and Engineers
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