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Homework Help: Oscillating mass

  1. Nov 7, 2004 #1
    simple pendulm

    If I suspend a baseball bat from one end and let it swing back and forth does it make a simple pendulm?
     
  2. jcsd
  3. Nov 7, 2004 #2
    Under what conditions does an oscillating mass tied to a string constitute a simple pendulum?
     
  4. Nov 7, 2004 #3

    Integral

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    Please show us that you have but some thought of your own into these questions.
     
  5. Nov 7, 2004 #4
    I know that a simple pendulum consists of a mass m tied to a string (considered massless) of length L. So If I suspend a baseball bat from one end and let it swing back and forth does it make a simple pendulm
     
  6. Nov 7, 2004 #5

    Pyrrhus

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    No, it will make a physical pendulum.
     
  7. Nov 7, 2004 #6
    Under what conditions does an oscillating mass tied to a string constitute a simple pendulum?
     
  8. Nov 7, 2004 #7

    Pyrrhus

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    When it's point-mass ([itex] I_{cm} = mr^2 [/itex]) tied to the massless string.

    Try it:

    Physical pendulum Period

    [tex] T = 2 \pi \sqrt{\frac{I}{mgd}} [/tex]

    Substituting for ([itex] I_{cm} = mr^2 [/itex])

    [tex] T = 2 \pi \sqrt{\frac{mr^2}{mgd}} [/tex]

    [itex] d = l = r [/itex]

    [tex] T = 2 \pi \sqrt{\frac{l}{g}} [/tex]
     
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