PEARSON ETEXT ENGINEERING MECH & STATS
15th Edition
ISBN: 9780137514724
Author: HIBBELER
Publisher: PEARSON
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Chapter 17, Problem 8RP
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The flat circular disk rotates about a vertical axis through O with a slowly increasing angular velocity w. Prior to rotation, each of the
0.52-kg sliding blocks has the position x = 28 mm with no force in its attached spring. Each spring has a stiffness of 430 N/m.
Determine the value of x for each spring for a steady speed of 279 rev/min. Also calculate the normal force N exerted by the side of the
slot on the block. The force N is positive if it pushes from the side labeled A. Neglect any friction between the blocks and the slots, and
neglect the mass of the springs. (Hint: Sum forces along and normal to the slot.)
Answers:
X =
wwwwwwww
N =
i
i
-74-74-
mm
mm
mm
N
The spring-mounted 0.62-kg collar A oscillates along the horizontal rod, which is rotating at the constant
angular rate ở = 6.3 rad/s. At a certain instant, ris increasing at the rate of 630 mm/s. If the coefficient of
kinetic friction between the collar and the rod is 0.46, calculate the friction force F exerted by the rod on
the collar at this instant.
Vertical
Answer: F = i
N
The 0.6-lb particle is guided along the circular path using the
slotted arm guide. Motion occurs in the horizontal plane with
negligible friction. Note that the circular part of the slot has the
radius equal to 0.5 ft, and the radial position, r, is measured from
the hinge and the angle is measured in the counter-clockwise
direction. If the arm has an angular velocity = 4 rad/sec and
an angular acceleration 6 - 8 rad/sec² at the instant when 0 =
30°, determine the force of the arm guide on the particle at the
instant. Present your answer in lb using 3 significant figures.
0.5 ft
0
0.5 ft.
Chapter 17 Solutions
PEARSON ETEXT ENGINEERING MECH & STATS
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