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# Ch5 HW4 - WebAssign Ch5 HW4(Homework Current Score 21 out...

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Ch5 HW4 (Homework) Arthur Barfield PHYS 2211, section M, Fall 2008 Instructor: Jennifer Curtis Web Assign Current Score: 21 out of 21 Due: Monday, October 6, 2008 09:00 AM EDT Description Potential energy; gravitational potential energy Instructions Reading: Sections 5.8-5.10 Note that question 2 can help you organize your work on question 3. The due date for this assignment is past. Your work can be viewed below, but no changes can be made. 1. [MI2 05.X.25] 1/1 points Consider an isolated system, by which we mean a system free of external forces. If the sum of the particle energies in the system increases by 149 joules, what must have been the change U in the system's potential energy? U = -149 -149 J Solution or Explanation ( E particles + U ) = W ext Here, W ext = 0 because the system is isolated, so neccesarily U = - E particles . 2. [MI2 05.X.30.01] 8/8 points

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The diagram above shows the path of a comet orbiting a star. You will be asked to rank order various quantities in terms of their values at the locations marked on the path, with the largest first. You can use the symbols ">" and "=". For example, if you were asked to rank order the
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