{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

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

This preview shows pages 1–2. Sign up to view the full content.

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

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}