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# Quiz5a - c The total momentum of the system is zero d You...

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Physics 53 Quiz #5a Fall 2007 Name ___________________________ Recit. Section _______ Circle the correct answer: 1. [3 points] At which location is the center of mass of the three objects shown in the illustration? a) Point A. b) Point B. c) Point C. 5 kg 2 kg 8 kg C B A 2. [2 points] A system of particles is known to have a total kinetic energy of zero, i.e. the sum of the kinetic energies of all its constituent particles is zero. What can you say about the total momentum of the system? a) At least one particle in the system has negative momentum. b) The system must be composed of at least two particles.
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Unformatted text preview: c) The total momentum of the system is zero. d) You cannot say anything about the momentum of the system. 3. [5 points] Two balls approach each other from opposite directions with the same speed of 6.0 m/s and scatter elastically. One ball has twice the mass of the other ball. The lighter ball scatters at an angle of 90.0°, the heavier one scatters at an angle θ = 52.2°. What is the speed of the heavier ball after the collision? a) 4.00 m/s. b) 4.33 m/s. c) 4.66 m/s. d) 4.90 m/s 1 1’ 2’ 2 θ...
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