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ME 240 Fall 2008
Problem Set 7: Due October 31
Problem 1:
The disk rotates about a fixed axis through O with angular velocity
ω
=
5 rad/sec and angular
acceleration
α
=
3 rad/sec
2
in the direction shown at a certain instant. The small sphere A moves
in the circular slot, and at the same instant,
β
=
30
o
,
𝛽
= 2 rad/sec, and
𝛽
=  4 rad/sec
2
.
Determine the absolute velocity and acceleration of A at this instant.
Problem 2:
The disk rotates
in the horizontal plane
about a fixed shaft at the origin with constant
angular
velocity
ω
= 10 rad/s. The 2kg slider
A
moves in a smooth slot in the disk. The spring
is
unstretched when
x
= 0 and its constant is
k
= 400 N/m. Determine the acceleration of
A
relative
to
the bodyfixed coordinate system when
x
= 0
.
4 m.
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Problem 3:
The object consists of the 2kg slender bar
ABC
welded to the 3kg slender bar
BDE
. The
y
axis
is vertical. At the instant shown, the object has a counterclockwise angular velocity of 5 rad/s.
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 Fall '09
 PERKINS
 Mass, Angular velocity, Angular Acceleration, Velocity, constant angular velocity, Meriam & Kraige

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