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LBloom
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Homework Statement
A thin rod of mass M and length L rests on a frictionless table and is struck L/4 from its CM by a clay ball of mass m moving at speed v. The ball sticks to the rod. Determine the translational and rotational motion.
Homework Equations
Irod=1/12*M*R^2
I=mR^2
L=Iw or L=r*m*v
L=constant
The Attempt at a Solution
I figured out the answer for the first part, but the second part has me stuck. I got:
m*v*L/4=(Irod+1/16*m*L^2)*w, where Irod=1/12*M*R^2
When i solve for w i get: [12m/(4M+3m)]*v/L
However the textbook says the answer is: [12m/(4M+7m)]*v/l
It looks like a made a mistake when calculating the moment of inertia for the clay blob, but i don't know where i made the mistake. I think it was in the beginning with Lbefore=Lafter, but i don't see it.