HourExam_3_2008_Spring_Lu - 12:00-12:50pm PHYS 116 Sec 003...

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4/7/08, 12:00-12:50pm PHYS 116 Sec. 003, Lu Hour Exam #3 Your Name _____________________________ PID ______________________ Row # ______ All your work should be shown on these sheets. If you need more space, work on the back of the pages and indicate where the extra work can be found. You are expected to sign the Honor Pledge below at the end of the exam . Honor Pledge Signature: ________________________________________ +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Score: Question 1 ______ Question 2 ______ Question 3 ______ Question 4 ______ Question 5 ______ Total: __________ +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1. (15 points, 5 each) Answer following questions. (a) What is the difference between elastic and inelastic collisions? (b) Figure to the left shows a cubical box that has been constructed from uniform metal plate of negligible thickness. The box is open at the top and has edge length L = 10 cm. What is the coordinates of the center of mass of the box? (c) What are the Kepler’s three laws of planet motion?
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