An open cart rolls along of frictionless axles while it is raining. As it rolls what happens to the
speed of the car as the rain collects in it.
C. Slows down
An 18 wheeler and a Volkswagen beetle are rolling along with the same momentum. If you exert
the same force to stop each one, for which is the stopping distance greater?
B. Volkswagen beetle
An object mass of 3.0 kg is allowed to fall from rest under the force of gravity for 3.4 seconds.
What is the change in momentum?
Ignore air resistance
M=3.0kg
t=3.4
P=Ft
=mgt
=3*9.81*3.4
=100kg/s direction down
An astronaut is talking a spacewalk when his tether breaks. He has a big drill. How can he get
back to the space ship?
A ) Face away from the ship and throw the drill forward.
A rifle has a mass of 4.5kg and it fires a bullet of 10.0 grams at a muzzle speed of 820 m/s.
What
is the recoil speed of the rifle as the
bullet leaves the barrel.
M
m
= 4.5
M
b
=10g
Vb=820
Vr=?
Pi=PB
0=M
m
Vr +MbVb
Vr=10*10
3
* 820 /
4.5 = 1.82 m/s
6f/s
Example
Particle A is at the origin and has a mass of 30.0 grams. Particle B has a mass of 10.0 grams.
Where must particle B be located so that the center of mass is located at the point x .
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 Spring '09
 HUANG
 Mass, Fahrenheit, Volkswagen, Boxcar, Text Problem

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