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PHY 126 Midterm Exam IB
Problem 1(10+15+5 points)
Chapters
10,11,12,13,14
A rod is attached to a pivot on the wall
at one end and suspended horizontally at
the other end by a wire (See Fig.). The
rod has mass M=1.0 kg and length L=2.0m.
At the end suspended, an object of mass m
= 0.5 kg is hung by a wire. Ignore the weights
of the wires.
(a) Find the tension T on the wire that suspends the
rod. The wire makes 30
o
with respect to the rod.
(b) Calculate the x and ycomponent of the force R on the rod at the pivot.
(c) Calculate the angle of the force R with respect to the horizontal.
Ignore weights of wires
wire
°
30
R
T
L
rod
pivot
m
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View Full DocumentProblem 2(10+10+10 points)
ω
A
A solid cylinder (mass M, radius R) is
rotating with an angular velocity
about
an axis perpendicular to the cylinder through
the center as shown in Fig.A.
(a)If you put another cylinder made of the
same material with the same thickness
but with the radius of ½ R on top
of the original cylinder, what will the
angular velocity be
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 Summer '08
 Staff
 Physics, Mass

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