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A pendulum on some moon has a length of 1.5meters and a period of

  1. Jan 4, 2012 #1
    A pendulum on some moon has a length of 1.5meters and a period of 4.2seconds. On earth a girl throws a rock 13meters in the air, if she was on that moon how high would that same rock go if she threw it with the same effect? (Ignore all air resistance)
     
  2. jcsd
  3. Jan 4, 2012 #2
    Re: Pendulum

    T=2[itex]\pi[/itex][itex]\sqrt{\frac{L}{g}}[/itex]

    g=[itex]\frac{4\pi^{2}L}{T^{2}}[/itex]

    g=[itex]\frac{4\pi^{2}1.5}{4.2^{2}}[/itex]

    g= 3.3570083m/s2

    Does that help you a bit?
     
  4. Jan 4, 2012 #3
    Re: Pendulum

    I found the gravity okay, it was the next part that I got hung up on.
     
  5. Jan 4, 2012 #4
    Re: Pendulum

    Can you work out the initial velocity for the rock on the earth?
     
  6. Jan 4, 2012 #5
    Re: Pendulum

    That's the train of thought that I had, but I don't know how I would do that.
     
  7. Jan 4, 2012 #6
    Re: Pendulum

    Think of the SUVAT equations, you know,

    S = 13m
    U = ?
    V = 0 as at the maximum height the velocity will be zero
    A = g for Earth


    T doesn't matter

    Which SUVAT equation has those 4 variables in it - SUVA ?
     
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