MasteringPhysics-ch 10

# MasteringPhysics-ch 10 - MasteringPhysics Assignment Print...

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MasteringPhysics: Assignment Print View http://session.masteringphysics.com/myct/assignmentPrint?assignm. .. 1 of 15 10/21/07 4:29 PM [ Print View ] physics 2211 MP10:Chapter 10 Due at 5:30pm on Monday, October 22, 2007 View Grading Details Pucks on Ice Two hockey players, Aaron and Brunnhilde, are pushing two pucks on a frictionless ice rink. The pucks are initially at rest on the starting line. Brunnhilde is pushing puck B, which has a mass three times as great as that of puck A, which Aaron is pushing. The players exert equal constant forces of magnitude on their pucks, directed horizontally, towards the finish line. They start pushing at the same time, and each player pushes his or her puck until it crosses the finish line, a distance away. Part A Which puck reaches the finish line first? Part A.1 Compute the relative acceleration of the pucks Part not displayed ANSWER: Both pucks reach the finish line at the same time. Puck A reaches the finish line first. Puck B reaches the finish line first. More information is needed to answer this question. Part B Let be the magnitude of the kinetic energy of puck A at the instant it reaches the finish line. Similarly, is the magnitude of the kinetic energy of puck B at the (possibly different) instant it reaches the finish line. Which of the following statements is true? Part B.1 Determine the simplest way to answer this question Part not displayed Part B.2 Work done on puck A [ Print ]

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MasteringPhysics: Assignment Print View http://session.masteringphysics.com/myct/assignmentPrint?assignm. .. 2 of 15 10/21/07 4:29 PM Part B.3 Work done on puck B Part not displayed ANSWER: You need more information to decide. Part C Let be the magnitude of the momentum of puck A at the instant it reaches the finish line. Similarly, is the magnitude of the momentum of puck B at the (possibly different) instant it reaches the finish line. Which of the following statements is true? Part C.1 Method 1: Compute the ratio of the pucks' velocities Part not displayed Hint C.2 Method 2: Use the impulse-momentum theorem Hint not displayed Choose the best option. ANSWER: You need more information to decide. PSS 10.1: College Bored Learning Goal: To practice Problem-Solving Strategy 10.1 for problems involving conservation of mechancial energy. A bored college student decides to try bungee jumping. He attaches an elastic bungee cord to his ankles and happily jumps off a tall bridge across a river. He ends up barely touching the water before the cord jerks him back up. What is the mass of the student? The length of the relaxed cord is ; the distance from the bridge to the river surface is (where ), and the spring constant of the elastic cord is . MODEL:
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MasteringPhysics-ch 10 - MasteringPhysics Assignment Print...

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