practice 09 – ALIBHAI, ZAHID
1
Latest unpenalized work: Mar 25 2007 Sun
day 04:00 (after this date you can not make
a perfect score).
Work cutoff: Mar 25 2007,
4:00 am.
Question 1
part 1 of 1
10 points
Assume
an elastic collision (ignoring fric
tion and rotational motion).
A queue ball initially moving at 4
.
2 m
/
s
strikes a stationary eight ball of the same size
and mass. After the collision, the queue ball’s
final speed is 1
.
8 m
/
s
.
4
.
2 m
/
s
1
.
8 m
/
s
θ
φ
Before
After
Find the queue ball’s angle
θ
with respect
to its original line of motion.
Answer in units of
◦
.
Question 2
part 1 of 1
10 points
Two identical balls are on a frictionless hor
izontal tabletop. Ball
X
initially moves at 10
meters per second, as shown in figure on the
lefthand side. It then collides elastically with
ball
Y
, which is initially at rest. After the col
lision, ball
X
moves at 6 meters per second
along a path at 53
◦
to its original direction,
as shown in on the righthand side.
10 m/s
X
before
Y
after
6 m/s
X
0 m/s
53
◦
Which of the following diagrams best repre
sents the motion of ball
Y
after the collision?
1.
8 m/s
Y
after
2.
after
4 m/s
Y
53
◦
3.
6 m/s
Y
after
4.
after
8 m/s
Y
53
◦
5.
0 m/s
Y
after
6.
after
6 m/s
Y
37
◦
7.
after
8 m/s
Y
37
◦
8.
after
4 m/s
Y
37
◦
9.
4 m/s
Y
after
10.
after
6 m/s
Y
53
◦
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practice 09 – ALIBHAI, ZAHID
2
Question 3
part 1 of 3
10 points
A hockey puck of mass 0.6 kg with an ini
tial speed of 9
.
14 m
/
s collides elastically with
another equally massive puck initially at rest.
After the collision, the two hockey pucks are
observed to have the same speed, each recoil
ing symmetrically at equal magnitude but op
positely directed angles from the initial puck’s
direction.
v
0
v
v
Φ
Before
After
What is the angle Φ between the two recoil
ing pucks?
Answer in units of
◦
.
Question 4
part 2 of 3
10 points
What is the speed of each recoiling puck?
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 Spring '08
 Turner
 Friction, Kinetic Energy, Mass, Work, Moment Of Inertia, Physical quantities

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