PEARSON ETEXT ENGINEERING MECH & STATS
15th Edition
ISBN: 9780137514724
Author: HIBBELER
Publisher: PEARSON
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Students have asked these similar questions
3. Car A has a mass of 1.4 Mg with center of
gravity at point G as shown in Fig. 3. If car B
exert a 2 kN, determine whether the force
is sufficient to move car A. The static and
dynamic friction coefficients between tyre
and the road are μ, = 0,5 and μ = 0,35.
Assume the surface of car B bumper to be
frictionless.
0.5 m
0.8 m 0.8 mi
2 kN
0.4 m
Gambar 3. Tyre-Road friction
For the given system, the cylinder of mass m is attached to a frictionless pulley. The chord attached to
the 60.0 kg block runs through the fixed drum with coefficient of friction equal to 0.20. The coefficient of
friction between the block and the incline is 0.15. Determine the range of mass m so that the system
remains at rest.
60 kg
u=0.20
H-0.15
20°
m
Solution guide:
Consider Case 1: the motion is impending down the plane.
o What are the forces acting on the 60 kg block?
o What is the direction of friction force?
o Calculate the tension force acting on the block. Is this the heavier tension or
the weaker tension?
Consider Case 2: the motion is impending up the plane.
o What are the forces acting on the 60 kg block?
o What is the direction of friction force this time?
o Calculate the tension force acting on the block. Is this the heavier tension or
the weaker tension?
(Note: Please match your answer to the provided answer, Answer: 16.4348 kg Sm S 85.0868 kg
Q1. The member OA rotates about a horizontal axis through O with a constant counter
clockwise velocity w=2 rad/s. As it passes the position 0 = 0°, a small block of mass m is
placed on it at a radial distance r = 400 mm.
(a) If the block is observed to slip at 0 = 50°, determine the coefficient of static friction
us between the block and the member.
(b) Before the block slips, calculate the value of 0 at which there is no frictional force
applied to the mass.
(c) At a later stage, the angular velocity is increased from 2 rad/s to 7 rad/s in 3
seconds. The angular acceleration is known to be a = k t, where t is time. Find k.
%3D
m
Figure Q1
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