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118
2.
Strike 2.
A hockey puck of mass
m
= 2 kg slides due East at
v
1
= 15 m/s. It bumps into the brick as before.
Afterwards, the puck slides away to the northeast with velocity
v
2
= 10 m s
1
at
θ
= 30°, and the brick
slides to the southeast at
V
2
at angle
φ
.
What is the final velocity
of the brick (we need a direction here)?
Is this an elastic collision (does it conserve kinetic energy)?
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Energy and Conservation of Momentum
Suppose I have a system of two pucks on an air hockey table, a 5.00 kg block puck initially moving at
3.00 m/s to the right toward a 3.00 kg puck moving initially to the left at 1.00 m/s.
Consider different situations with the pucks having the same mass and initial velocities in each situation,
but with the pucks being made of different materials in each case.
(a) After the collision the velocity of the 5 kg puck is 1.50 m/s to the right.
(b) After the collision the velocity of the 5 kg puck is 0.90 m/s to the right.
(c) After the collision the velocity of the 5 kg puck is stationary.
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This note was uploaded on 11/26/2011 for the course PHY 2053 taught by Professor Lind during the Fall '09 term at FSU.
 Fall '09
 LIND

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