P1112 Spring 2009
Homework #10
HW #10 will not be collected.
Solutions posted
Tuesday March 31. (Problems 2 and 3 are relevant
for the prelim). Quiz on HW #10 and HW #11 first
section of week of April 13.
Reading: Text 8.6, Chapter 9.
Problems:
1. Y&F 8.113 (b)
Center of mass of a variable
density rod
(we’ll do Part (a) in lecture).
2. Y&F 8.61
A singlestage rocket is accelerated
from rest from a deepspace platform, where gravity
is negligible. If the rocket burns its fuel in a time of
50.0 s, and the relative speed of the exhaust gas is
2100 m/s, what must the mass ration m
0
/m be for a
final speed of 8.0 km/s?
3.
Y&F 9.25
A flywheel with a radius of 0.30 m
starts from rest and accelerates with a constant
angular acceleration of 0.60 rad/s
2
. Compute the
magnitude of the tangential acceleration, the radial
acceleration and the resultant acceleration of a point
on its rim
a) at the start,
b) after it has turned through 60.0
0
,
c) after it has turned through 120.0
0
.
4.
Illustrated below is a flat square plate of mass
M
,
with sides of length
R
.
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 Spring '07
 LECLAIR,A
 Work, Moment Of Inertia, Rotation, 0.30 M, 8.0 km, 0.60 rad, 2100 m/s

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