http://tinypic.com/view.php?pic=30li992&s=8#.U-FgHlZycpE The next problems are b
ID: 1272207 • Letter: H
Question
http://tinypic.com/view.php?pic=30li992&s=8#.U-FgHlZycpE
The next problems are based on the initial momentum vectors shown above.
1. Select the verbal description below that best describes the results of an elastic collision described by the initial momentum vectors at top.
A massless bumper car carrying three adults collides head-on with a massless bumper car carrying one adult. Both bumper cars are at same speed.
A hockey player at high speed checks a low speed hockey player of identical weight, falling on top of each other on the ice.
A Geo of mass "m" traveling East at 30mph collides with a Cadillac of mass "3m" traveling South at 30mph at an intersection, crashing into each other.
A potato of mass "m" is shot from a plastic cannon of mass "3m".
A molecule of air traveling at +300m/s collides with a molecule of air traveling +100m/s.
2. Assume the collision at top was inelastic and both objects had the same initial speed. Calculate that initial speed if the final speed of the combined objects is 2m/s.
a. 8m/s
b. 4m/s
c. 2m/s
d. 3m/s
e. 1m/s
3. Which of the following graphs describes the ratio of kinetic energies before and after collision if it were purely elastic?
OPTIONS>>> http://tinypic.com/view.php?pic=2ls9y6c&s=8#.U-Fg2VZycpE
a.A massless bumper car carrying three adults collides head-on with a massless bumper car carrying one adult. Both bumper cars are at same speed.
b.A hockey player at high speed checks a low speed hockey player of identical weight, falling on top of each other on the ice.
c.A Geo of mass "m" traveling East at 30mph collides with a Cadillac of mass "3m" traveling South at 30mph at an intersection, crashing into each other.
d.A potato of mass "m" is shot from a plastic cannon of mass "3m".
e.A molecule of air traveling at +300m/s collides with a molecule of air traveling +100m/s.
Explanation / Answer
1) e as length of left vector is thrice of other one ..so this is best description.. (ans)
2)Vf=mv/m+m
Vf=Vi/2
Vi=4 m/sec
So b is correct (ans)
3) b
as energy is conserved in elastic collision (ans)
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