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Unformatted text preview: Version 090 Quiz 2 Coker (56625) 1 This printout should have 22 questions. Multiplechoice questions may continue on the next column or page find all choices before answering. Quiz 2 covers Chapters 5 through 9 in the text: Newtons 2nd and 3rd laws, work, ki netic energy, potential energy, conservation of energy, power, and binding energy, Newtons Law of Gravity, orbits circular and elliptical, and conservation of energy based on Newto nian gravity. 001 10.0 points Two objects are traveling through empty space with the same kinetic energy. Object P has eight times the mass of object Q. How do their speeds compare; i.e. , what is the ratio v Q v P ? 1. Insufficient information is given. 2. 1 8 3. 8 correct 4. 1 8 5. 64 6. 1 64 7. 8 Explanation: K = 1 2 m Q v Q 2 = 1 2 m P v P 2 m Q v 2 Q = (8 m Q ) v 2 P v Q v P = 8 . The less massive object Q must be moving faster if it has the same kinetic energy as the more massive object P. 002 10.0 points If F 1 is the magnitude of the force exerted by the Earth on a satellite in orbit about the Earth and F 2 is the magnitude of the force exerted by the satellite on the Earth, then which of the following is true? 1. F 1 > F 2 . 2. F 2 F 1 . 3. F 1 F 2 . 4. F 1 = F 2 . correct 5. F 2 > F 1 . Explanation: The forces must be equal in magnitude but opposite in direction. 003 10.0 points Imagine a system of fundamental particles that is made up of 5 identical particles, each with a mass of 1000 MeV/ c 2 . If the binding energy of the system is 30 MeV, what is the mass of this system of par ticles? 1. None of these 2. 5000 MeV 3. 5030 MeV 4. 4850 MeV 5. 4970 MeV correct 6. 5150 MeV Explanation: Since the total energy of a bound system is negative, the mass of the system is less than the mass of the constituents that make it up. In this case M c 2 = 5 mc 2 B , where B = E is the binding energy and m is the mass of an individual constituent particle. Thus, the total mass of the system is 5 (1000) MeV 30 MeV = 4970 MeV . 004 10.0 points Version 090 Quiz 2 Coker (56625) 2 Consider two different situations. In situation A, a box of mass M on a frictionless tabletop is being pulled by a constant horizontal force F = mg . In situation B, a box of mass M is on a frictionless tabletop and a string of negligible mass runs over a peg of negligible friction, to a hanging mass m which is allowed to fall. M F = mg M b m mg In which situation would the acceleration a of the box of mass M be the largest? 1. Initially, the acceleration is largest in sit uation B, but as the mass m begins to fall faster, it will become largest in situation A. 2. Initially, the acceleration is largest in sit uation A, but as the mass m begins to fall faster, it will become largest in situation B....
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 Fall '08
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