EGM
3400
and
3401 (circle one)
NAME:_______________________
Spring 2007
Quiz 10
Open book/Closed notes – Time limit = 25 minutes
The uniform rod OC is 0.5 m long, has a mass of 10
kg, and is initially hanging straight down and at
rest.
A bullet (initially at A) has a mass of 20 g
and a horizontal speed of 700 m/s.
After the bullet
passes through the rod OC it is at B and now has a
speed of 400 m/s in the horizontal direction.
Find
the largest angle
θ
that the rod OC makes with the
vertical after the bullet passes through the rod.
rams
Solution:
Impulse on bullet:
()
0.02
400
700
6
bullet
mm
I
kg
i
N s i
ss
⎛⎞
=−
=
−
⎜⎟
⎝⎠
r
⋅
r
r
Therefore the angular impulse on the rod about the point O is:
(
)
0.5
6
3
mj
N si
N m s k
−×
⋅
=
⋅
⋅
r
rr
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 Spring '08
 CARLCRANE
 Dynamics, Angular Momentum, Force, Mass, Potential Energy, OC

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