PHY2020_Exam2_SOLUTIONS

PHY2020_Exam2_SOLUTIONS - PHY2020 Fall 2011, Test 2 I...

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PHY2020 Fall 2011, Test 2 I understand that the University of Florida expects its students to be honest in all their academic work. I agree to adhere to this commitment to academic honesty and understand that my failure to comply with this commitment may result in disciplinary action up to and including expulsion from the University. Name: _____________________________________________________ UF ID: _____________________________________________________
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Ignore air friction in all problems. Please give complete responses to all questions including units and theoretical justification for responses. You must show ALL of your work to receive full credit! Useful values and formulas: G = 6.7 10 -11 N m 2 / kg 2 M Earth = 5.98 * 10 24 kg R Earth = 6378 km 1 km = 0.62 miles = 3280.8 feet 1 kg = 2.2 lbs Moment of Inertia Cylinder of radius r, axis through center: 1/2 m r 2 Sphere of radius r, axis through center: 2/5 m r 2 Rod of length l, axis through center: 1/12 m l 2 Rod of length l, axis through end: 1/3 m l 2
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1. (6 pts) What does it mean for a quantity to be conserved? Give an example of a conserved quantity in real life. 3 pts: Conserved: for a system of objects, the quantity remains constant regardless of what happens in the system. 3 pts: Ex: slingshot + rock, cart at top of hill rolling to bottom of hill. 2. (6 pts) If you push against a brick wall are you doing work? Why or why not? 3 pts: No, because you’re not moving it any distance.
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This note was uploaded on 12/15/2011 for the course PHY 2020 taught by Professor Staff during the Spring '08 term at University of Florida.

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PHY2020_Exam2_SOLUTIONS - PHY2020 Fall 2011, Test 2 I...

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