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PHYSICS 111 SPRING 2008 HOMEWORK #
11
SOLUTION
Chap
7
, Question
18
Where would you expect the center of mass of a doughnut to located? Why?
Answer
: It is at the center of the circle. Since we can assume the doughnut’s mass is distributed
symmetrically about the center, then, the centerofmass point is located at the geometric center
of the object.
Chap 7, Problem 30
The drawing shows a collision between two pucks on an airhockey table. Puck A has a mass of
0.025kg and is moving along the x axis with a velocity of 5.5m/s. It makes a collision with puck
B, which has a mass of 0.050kg and is initially at rest. The collision is not headon. After the
collision, the two pucks fly apart with the angles shown in the drawing. Find the final speed of
(a) puck A and (b) puck B.
Solution
:
In this collision, the total momentum is conserved, which means both of the x and y component
of the total momentum will conserve.
X direction:
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This note was uploaded on 03/27/2008 for the course PHYS 111 taught by Professor Shinar during the Spring '08 term at Iowa State.
 Spring '08
 Shinar
 Physics, Center Of Mass, Mass, Work

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