Physics 112
Homework #12
Fall 2006
Read:
Chapter 10 (all)
Chapter 12 (section 12.5)
For discussion:
Chapter 10:
Qs #Q10.20, Q10.21, Q10.22, Q10.24, Q 10.25,
Q10.27, Q10.30
(not turned in)
Chapter 10:
Es & Ps: #10.35, 10.45, 10.47, 10.50, 10.70, 10.89,
10.91, 10.99
Chapter 12:
Es & Ps #12.74
Due Friday, Nov.17th, 2006, at lecture:
#10.48
[Precessing Gyroscope] #10.43[Parachuting onto a Turntable]
#10.39
[Block on String] #12.32 [Planet Vulcan]
1.
[From an old P112 Final
Exam]
A comet of mass m
orbits the Sun (of mass M >> m)
in an elliptical orbit, as shown.
The gravitational force acting on
the comet due to the Sun is
always directed towards the
Sun. At closest approach to the
Sun (
perihelion
P), the comet's
distance from the Sun is D.
At which point(s) in the orbit is:
(If two or more fit the answer, circle all that apply. If all apply, write"All".)
(a)
the gravitational force on the comet greatest?
A
B
C
P
(b)
the comet's kinetic energy (KE) greatest?
A
B
C
P
(c)
the gravitational potential energy (PE) highest?
A
B
C
P
(d)
the comet's KE + gravitational PE highest?
A
B
C
P
(e)
the comet's angular momentum about the Sun greatest?
A
B
C
P
Find the following quantities:
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 Fall '07
 LECLAIR,A
 mechanics, Angular Momentum, Mass, Potential Energy, Work, B B B B C C C C C P P P P

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