Physics 112
Homework #9
Spring 2006
*** Prelim Exam #2
is 7:309 PM onThursday evening, Apr. 6.
It covers chaps. #69 + secs. 10.3 (thru
Ex. 10.7) & 12.3, circular motion dynamics (sec. 5.4 + HW #5 problems), HWs #69, Labs #5 & 6 + Pre
Labs, COOPs #68, and all relevant lecture material.
Persons with conflicts or special needs please
contact Edith Cassel ASAP.
***
Read:
Chapter 8 (sections 8.4, 8.5),
Chapter 9 (all)
Chapter 10 (only section 10.3 through Example 10.7)
For discussion:
Chap. 8:
Qs #Q8.9, Q8.10, Q8.18, Q8.21;
Es & Ps: #8.43, 8.71, 8.93, 8.95, 8.97
(not turned in)
Chap. 9:
Qs #Q9.4, Q9.5, Q9.6, Q9.9, Q9.10, Q9.12, Q9.13, Q9.18, Q9.19, Q9.21
Chap. 9:
Es & Ps #9.1, 9.13, 9.25, 9.35, 9.71, 9.79, 9.83, 9.85
Chap. 10:
Qs #Q10.15, Q10.17, Q10.18;
Es & Ps #10.21, 10.67, 10.75
To be worked and discussed before Prelim Exam #2, but not turned in:
#8.65
[Railroad Handcar]
#9.52
[Parallel Axis Theorem]
#9.47
[Flywheel Energy Storage]
#9.89
[Disks, Blocks, & String]
#9.41
[Wagon Wheel]
Please add:
(b)
What is the wheel's
total
kinetic energy when rolling without
slipping at a speed of 3.0 m/s?
What fraction of this is
translational
KE?
What fraction is
rotational
KE?
(c)
If this wheel started rolling at 3.0 m/s up a hill of slope angle 20°, how far along the hill could it roll
freely without slipping until it came to rest?
1. [Melting the Polar caps]
The polar ice caps contain about 2.3 x 10
19
kg of ice. This mass contributes
essentially nothing to the moment of inertia of the earth because it is located at the poles, close to the axis
of rotation. Estimate the change in the length of the day that would be expected if the polar ice caps were
to melt and the water were distributed uniformly over the surface of the earth. (Hint: The moment of
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 Fall '07
 LECLAIR,A
 mechanics, Solar System, Circular Motion, Kinetic Energy, Mass, Work, polar ice caps

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