A local ice hockey team has asked you to design an apparatus for measuring the s

Question

A local ice hockey team has asked you to design an apparatus for measuring the speed of the hockey puck after a slap shot. Your design is a 2.00-m-long, uniform rod pivoted about one end so that it is free to rotate horizontally on the ice without friction. The 1.30-kg rod has a light basket at the other end to catch the 0.163-kg puck. The puck slides across the ice with velocity v (perpendicular to the rod), hits the basket, and is caught. After the collision, the rod rotates. Part A If the rod makes one revolution every 0.736 s after the puck is caught, what was the puck 's speed just before it hit the rod?

Explanation / Answer

Conserving angular momentum

mv*L=Iw

I=1/3*ML^2=1.73 kgm^2

T=0.836 sec

w=2*pi/T=8.53 rad/s

m=0.163 kg

L=2

putting value we got

v=Iw/mL=45.35 m/s

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