3
Question
A
molecule in a gas container hits a horizontal wall with speed 200 m
s–1
and angle 30° with the normal,
and rebounds with the same speed. Is momentum conserved in the
collision? Is the collision elastic or inelastic?
A molecule in a gas container hits a horizontal wall with speed 200 m s–1 and angle 30° with the normal, and rebounds with the same speed. Is momentum conserved in the collision? Is the collision elastic or inelastic?
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Solution
Yes;
Collision is elastic
The
momentum of the gas molecule remains
conserved whether the collision is elastic or inelastic.
The
gas molecule moves with a velocity of 200
m/s and strikes the stationary wall of the container, rebounding with
the same speed.
It shows
that the rebound velocity of the wall remains zero. Hence, the total
kinetic energy of the molecule remains conserved during the
collision. The given collision is an example of an elastic collision.
Yes; Collision is elastic
The momentum of the gas molecule remains conserved whether the collision is elastic or inelastic.
The gas molecule moves with a velocity of 200 m/s and strikes the stationary wall of the container, rebounding with the same speed.
It shows that the rebound velocity of the wall remains zero. Hence, the total kinetic energy of the molecule remains conserved during the collision. The given collision is an example of an elastic collision.
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