# Ch5 HW5 - WebAssign Ch5 HW5 (Homework) Current Score: 18...

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Ch5 HW5 (Homework) Arthur Barfield PHYS 2211, section M, Fall 2008 Instructor: Jennifer Curtis Web Assign Current Score: 18 out of 25 Due: Wednesday, October 8, 2008 09:00 AM EDT Description Gravitational potential energy; energy graphs Instructions Reading: Sections 5.10-5.11 Hint for problem 2: Start from fundamental physics principles and work the problem symbolically before plugging in numbers. The due date for this assignment is past. Your work can be viewed below, but no changes can be made. 1. [MI2 05.X.32.01] 6/6 points The diagram below is a graph of the energy of a system of a planet interacting with a star. The gravitational potential energy U g is shown as the thick curve, and plotted along the vertical axis are various values of K+U g . Suppose that K+U g of the system is A . Which of the following statements are true? The potential energy of the system decreases as the planet moves from r 1 to r 2 .

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When the separation between the two bodies is r 2 , the kinetic energy of the system is ( A - B ). When the separation between the two bodies is r 2 , the kinetic energy of the system is ( B - C ). The kinetic energy of the system is greater when the distance between the star and planet is r 1 than when the distance between the two bodies is r 2 . The planet will escape. The system is a bound system; the planet can never escape. Suppose instead that K+U g of the system is B . Which of the following statements are true? The planet and star cannot get farther apart than r 2 . When the separation between the planet and star is r 2 , the kinetic energy of the system is zero.
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## This note was uploaded on 04/19/2010 for the course PHYS 2212 taught by Professor Kindermann during the Spring '09 term at Georgia Tech.

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Ch5 HW5 - WebAssign Ch5 HW5 (Homework) Current Score: 18...

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