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# HW_12 - Physics 112 Read Chapter 10(all Chapter 12(section...

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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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HW_12 - Physics 112 Read Chapter 10(all Chapter 12(section...

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