October 13, 2015

Homework Help: physics

Posted by jim on Sunday, March 22, 2009 at 11:57pm.

As shown below, a bullet of mass m and speed v passes completely through a pendulum bob of mass M. The bullet emerges with a speed of v/2. The pendulum bob is suspended by a stiff rod of length and negligible mass. What is the minimum value of v such that the pendulum bob will barely swing through a complete vertical circle? (Use L for , g for gravity, and M and m as appropriate.)

I got the answer (4M/m)sqrt(gL) but the problem is that I did it a while ago and I completely forgot why this is the answer. Can anyone explain it to me?

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