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Homework Statement
A uniform solid sphere of mass M and radius R has a light, thin metal spike driven through it, so it is free to turn about this spike. So imagine a bowling ball on a stick that is free to rotate about this stick.
A bullet of mass m is fired at speed v into the ball at a distance 2R/3 from the center, and it comes to rest in the sphere. What is the final kinetic energy? Hint: angular momentum.
I recall my instructor saying it might or might not matter where the bullet ends up...but we never really concluded anything. If it does matter, let's say it ends up half way through the ball.
Homework Equations
The Attempt at a Solution
So we use angular momentum because it is conserved in this case, while linear momentum is not.
To be honest I'm not sure where to begin...I'm trying to put things together but I'm not sure where the distance 2R/3 comes into play, for example. If someone could help me out, I would really appreciate it.