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Unformatted text preview: Version 090 Quiz 2 Coker (56625) 1 This print-out should have 22 questions. Multiple-choice 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