CE 222 ENGINEERING MECHANICS II ( FALL
2003 – 2004 )
EXERCISE SHEET III
(
http://www.ce.metu.edu.tr/~ce222
)
1.
The 7 kg rod BC connects a disk centered
at A to crank CD. Knowing that the disk is
made to rotate at the constant speed of 180
r/min, determine for the position shown the
vertical components of the forces exerted on
rod BC by the pins at B and C
2.
The 240 kg crate is being lowered by
means of two overhead cranes. As the crate
approaches the ground, the crane operators
apply brakes to slow the motion. Determine the
acceleration of each cable at that instant,
knowing that T
A
=1900 N and T
B
=1600 N.
3.
A hemisphere of mass
m
and radius
r
is released
from rest in the position shown. Determine (a) the
minimum value of
m
s
for which the hemisphere starts
to roll without sliding, (b) the corresponding
acceleration of point B.
4.
The slender bar weighs 50N and the disk
weighs 100N. The coefficient of kinetic friction
between the disk and the horizontal surface is
m
k
=0.1. If the disk has an initial counterclockwise
angular velocity of 10 rad/s, how long does it take
to stop spinning?
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 Spring '09
 tuken
 Mass, Structural Engineering, Rotation, 1m, 0.6m, kg rod BC

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