Physics 2010 – Spring 2010
Recitation Assignment 6
NAME ________________________
Section Day (circle): M
Tu
W
Th
F
Time:
8a
10a
12p
2p
4p
TA Name:____________________
Instructions
:
Work in groups of 3 to 4
.
Use the space provided for your answers.
All
plots should have axes drawn neatly with a straight edge, with scales and units clearly labeled.
This week's assignment will have a little rotational motion, rigid body motion, and harmonic
motion.
1.
Consider a uniform disk of radius R = 0.1 m that is mounted on a rod
at the middle and is free to rotate.
a.
At first, the disk is not rotating. Then a constant torque is applied
over 5 seconds. At the end of this time, the disk is rotating with
angular speed (
π
/2) rad/sec. What is the magnitude of angular
acceleration,
α
?
b.
Let the mass of the disk be 20 g. What is its moment of inertia I?
c.
What is the magnitude of the torque that was exerted in part a?
d.
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 Spring '06
 DUBSON
 Physics, Energy, Kinetic Energy, Work, Moment Of Inertia, extended freebody diagram

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