Oregon State University
Physics 201
,
Fall 2009
HW5
W
(due Nov. 2 at 5:00 p.m.)
Page 1
Oregon State University
Physics 201
Fall Term,
l
2009
HW5
This HW assignment,
due November 2, covers topics in Chapter
o
9 of the text—freely mixed together (and
r
youʼll need the basics of projectile motion, too).
Donʼt forget the extra credit point available.
Follow
the recommended format for solutions, with SI units unless directed otherwise and 3 significant digits in
all numerical answers.
Use
a separate page for each solution—donʼt crowd your solutions on
a page.
Assume that the magnitude of local gravitational acceleration,
g, is 9.80 m/s
2
.
1.
A 250kg projectile is fired from the ground with a speed of 120 m/s at a 60.0° angle above the hori
zontal.
At the highest point of its arc, it
explodes into three pieces, A, B and C, all of equal mass.
Immediately after the explosion, pieces A and B are still moving with the same speed as the whole
projectile had
right before the explosion.
However, A is moving vertically downward, and B is mov
ing horizontally forward (i.e. in the same direction as the projectile prior to its explosion).
Find the
velocity of C right after the explosion.
2.
Two pucks collide on a level airhockey table.
Puck A has a mass of 0.0250 kg and is moving ini
tially due
eastward at a speed of 5.50 m/s.
Puck B has a mass of 0.0500 kg and is initially at rest.
f
Right after the collision, puck A is moving in a direction 65.0° north of east; and puck B is moving in
a direction 37°
south of east.
Find the speed of each puck right after the collision.
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 Fall '08
 Staff
 Physics, Angular Momentum, Mass, Moment Of Inertia, Rotation

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