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Unformatted text preview: 4/25/08 10:30 AM Ch5 HW4 S2008 Page 1 of 3 http:[email protected][email protected] Ch5 HW4 S2008 (Homework) KRISTIN SEILOFF PHYS 2211 M & N Spring 08, section N05, Spring 2008 Instructor: Jennifer Curtis 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. Web Assign Current Score: 9 out of 21 Due: Wednesday, February 27, 200812:00 PM EST 1. 1/1 points | 1/4 submissions 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 154 joules, what must have been the change U in the system's potential energy? U = -154-154 J Solution or Explanation ( E particles + U ) = W ext Here, W ext = 0 because the system is isolated, so neccesarily U = - E particles . 2. 8/8 points | 2/4 submissions 4/25/08 10:30 AM Ch5 HW4 S2008 Page 2 of 3 http:[email protected][email protected] 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 thelocations marked on the path, with the largest first....
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