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Unformatted text preview: Physics 53 Quiz #Sa 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. EU [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.
The total momentum of the system is zero.
) You cannot say anything about the momentum of the system. [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 90.00, the heavier one scatters at an
angle 0 = 52.20. What is the speed ofthe heavier ball after the collision? a) 4.00 m/s. b) 4.33 m/s. % 1’
c) 4.66 m/s. 5
4.90 m/s ' b.) Physics 53 Quiz #Sb 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.
Point B.
Point C. 9 kg 7 kg 5 kg
N  l l ‘ l l l ‘ l /”
Q l r ' i l l i l l l l r i i l r l l D
2. [2 points] A system of particles is known to have a total momentum of zero. What can you say about the total kinetic energy of the system, i.e. the sum of the kinetic
energies of all its constituent particles? a) At least one particle in the system has zero kinetic energy. b) The system must be composed of at least two particles. c) The total kinetic energy of the system is zero.
You cannot say anything about the total kinetic energy of the system. [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 three times the mass of the
other ball. The lighter ball scatters at an angle of 90.00, the heavier one scatters at
an angle 9 = 35.30. What is the Speed of the heavier ball after the collision? a) 4.00 m/s. b) 4.331n/s. T 1’ c) 4.66 m/s.
4.90 m/s DJ ...
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This note was uploaded on 05/13/2010 for the course PHYSICS 53L taught by Professor Mueller during the Fall '07 term at Duke.
 Fall '07
 Mueller
 Physics

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