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Quiz6 - Physics 7B-A/B Codes grading use only Quiz 6 DL sec...

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p A B C Physics 7B-A/B Quiz # 6 DL sec: Name: 2/27/08 last, first Codes: grading use only A A 1) Two circular pucks with velcro on their sides slide on a frictionless horizontal air table. Puck 1 whose mass is 0.10 kg is initially traveling in the positive x direction with speed 4.0 m/s. Puck 2 whose mass is 0.30 kg is initially traveling in the positive y direction with speed 4.0 m/s. They collide and stick together. a) Draw a proper momentum chart showing the directions of the momenta and explicitly calculate values of the components of the momenta. Closed System p i Îp p f puck 1 puck 2 total system 0.4 0 0.4 0 0.4 -0.3 0.1 0.3 0.3 x components (kg·m/s) Closed System p i Îp p f total system 1.2 0 0.3 -0.3 1.2 0.3 y components (kg·m/s) puck 1 puck 2 0 1.2 0.9 Note: Í p xi = Íp xf õ 0.4 kg·m/s = (0.1 kg+0.3 kg) v xf õ v xf = 1 m/s Í p yi = Íp yf õ 1.2 kg·m/s = (0.1 kg+0.3 kg) v xf õ v xf = 3 m/s b) Find the kinetic energy lost in the collision. K lost = K i - K f = 1 2 0.1 kg ( ) 4m/s ( ) 2 + 1 2 0.3 kg ( ) 4m/s ( ) 2 1 2 0.4 kg ( ) 1 2 + 3 2 m/s ( ) 2 K lost = 3.2 J - 2.0 J = 1.2 J 2) A ball
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