You are on a team that is trying to build a device to determine the speed of hoc

Question

You are on a team that is trying to build a device to determine the speed of hockey pucks shot along the ice. The device consists of a rod which rests the ice and is fastened to the ice at one end so that it is free to rotate horizontally. The free end of the rod has a small, light net which will catch the hockey puck- The pack slides across the ice perpendicular to the rod and is caught in the basket which is initially at rest. The rod then rotates. The rod is 32 cm long, has a mass of 0.27 kg. and a moment of inert in given by (1/3)ML2. The mass of the puck is 165 grams. After the puck hits the rest, the rod rotates at a rate of 2 2 revolutions per second Determine the speed of the pock before it hits the net.

Explanation / Answer

0.5*0.165*v2=1/3(0.27*2) + 0.5*0.165*2*L2

=4.4/s

L=0.32m

0.0825v2=0.9*(4.4)2+0.0825*0.322*(4.4)2

173.6/0.0825=v2

v=45.87m/s

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