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Hockey puck momentum, conservation of linear momentum

by jehan4141
Tags: conservation, hockey, linear, momentum, puck
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jehan4141
#1
Oct14-11, 08:20 PM
P: 91
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The drawing shows a collision between two pucks on an air-hockey table. Puck A has a mass of 0.0480 kg and is moving along the x axis with a velocity of +7.76 m/s. It makes a collision with puck B, which has a mass of 0.0960 kg and is initially at rest. The collision is not head-on. After the collision, the two pucks fly apart with the angles shown in the drawing. Find the speed of (a) puck A and (b) puck B.

There are no answers provided. Could someone please tell me if my answers are correct?

Momentum in the y direction
Piy = Pfy
0 = MaVasin65 + -MbVbsin37
MaVasin65 = MbVbsin37
Va = MbVbsin37 / Ma*sin65
Va = (0.096sin37Vb) / (0.048sin65)

Pix = Pfx
0.048(7.76) = 0.048cos65Va + 0.096cos37Vb

Plug Va in and you get Vb = 3.595 m/s and thus Va = 4.77 m/s ?
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grzz
#2
Oct15-11, 08:46 AM
P: 950
Yes.


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