Physics 111,
Exam 3A
A
Part I
. Put the answers to these 12 questions on your SCANTRON sheet. Your answer should be CLOSEST TO THE GIVEN
1)
An 1800kg car stopped at a traffic light is struck from the rear by a 900 kg car and the two become entangled. If the
smaller car was moving at 20m/s before collision, what is the speed of the entangled mass after the collision?
a) 6.67 m/s
b) 0 m/s
c) 10.23 m/s
d) 0.67 m/s
e) 300 m/s
2)
A body of mass 2.0kg makes an elastic collision with another body at rest and continues to move in the original
direction but with one fourth (1/4) of its original speed. What is the mass of the other body?
a) 4.2kg
b) 1.2kg
c) 3.7kg
d) 0.6kg
e) 29kg
3)
Two titanium spheres approach each other head on with the same speed and collide elastically. After the collision, one
of the spheres, whose mass is 300g, remains at rest. What is the mass of the other sphere?
a) 0.6kg
b) 0.1kg
c) 1.5kg
d) 2.9kg
e) 10.2kg
4)
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 Spring '08
 moro
 Angular Momentum, Light, Moment Of Inertia, Rigid Body, Rotation

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