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revwk7f09 - October 12th-October 13th 2009 PHY 2048...

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October 12 th -October 13 th , 2009 PHY 2048 Discussion Fall ’09 Conceptual Review: Chapter 8.5-9.12 A . Work-Energy Theorem 1. Write down the work-energy theorem in two ways. 2. Only conservative forces are exerted on an object. What quantity is conserved? 3. A figure on the right shows a mass m attached to a string of negligible mass. What initial velocity do you need to give at the lowest point for the mass to take a circular path? 4. A block with an initial velocity v slides along a track that descends through a vertical distance h. The track is frictionless except for the lower section; there the block slides to a stop in a distance D due to friction. What is the change in thermal energy of the system? Does it depend on D? B. Center of Mass 1. Three uniform thin rods form an inverted U as shown, where L = 20 cm, M = 40g and m = 30 g. Find the center of mass. C. Impulse-Momentum Theorem 1. A 2-kg ball drops vertically onto a floor, hitting with a speed of 20 m/s. It rebounds with an initial speed of 10 m/s. If the ball is in contact w/ the floor for 0.05s, what is the average force exerted on the
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