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Pendulum problem in KE chapter

  1. Oct 19, 2006 #1
    Hi Everyone,

    My question is as follows:

    A bullet of mass m and speed v passes completely through a pendulum bob of mass M. The bullet emerges with a speed 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 M for M, m for m, l for , and g for gravity, as necessary.)

    Any suggestions would be greatly appreciated! :smile: Thanks so much!
  2. jcsd
  3. Oct 19, 2006 #2

    Doc Al

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    Staff: Mentor

    Why don't you give it a shot? Here's a hint: You'll need to use two conservation laws.
  4. Oct 19, 2006 #3
    1) conservation of momentum
    2) conservation of energy

    Am I right?
  5. Oct 19, 2006 #4

    Doc Al

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    Staff: Mentor

    You are correct.
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