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23. In the reflection process, only the normal component of the momentum changes, so
for one molecule the change in momentum is 2
mv
cos
θ
, where
m
is the mass of the
molecule,
v
is its speed, and
is the angle between its velocity and the normal to the wall.
If
N
molecules collide with the wall, then the change in their total momentum is 2
Nmv
cos
, and if the total time taken for the collisions is
Δ
t
, then the average rate of change of
the total momentum is 2(
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This note was uploaded on 06/03/2011 for the course PHY 2049 taught by Professor Any during the Spring '08 term at University of Florida.
 Spring '08
 Any
 Physics, Mass, Momentum

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