PEARSON ETEXT ENGINEERING MECH & STATS
15th Edition
ISBN: 9780137514724
Author: HIBBELER
Publisher: PEARSON
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Question
Chapter 8, Problem 7RP
To determine
The maximum distance where the block can be placed from A and still remain in equilibrium.
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3. The ladder has a uniform weight of 80 lb and rests
against the wall at B. If the coefficient if static friction
at A and B is µ = 0.40, determine the smallest angle 0
at which the ladder will not slip.
15 ft
1. If the spring is compressed a distance 6 and the coefficient of static friction between the tapered
stub S and the slider A is sA, determine the horizontal force P needed to move the slider
forward.The stub is free to move without friction within the fixed collar C. The coefficient of static
friction between A and surface B is µAB. Neglect the weights of the slider and stub.
Given:
8 = 60 mm
HsA = 0.5
HAB =
= 0.4
N
k = 300
e = 30 deg
B
Force P is applied to the end of a rope being used to hold the 50-lb block on the 20° incline.
The coefficient of static friction between the block and the incline is u. = 0.30. Determine
the largest value of P for which the block is in equilibrium and will not begin to move up
the incline when 0 = 15°.
Hs
= 0.30
20°
The solution to this problem requires a free-body diagram of the block, and a sketch of the
coordinate system used. Use the components of the forces with EF = 0 and EF, = 0 to
y
apply ΣF=0.
Chapter 8 Solutions
PEARSON ETEXT ENGINEERING MECH & STATS
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