1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Graphing pendulum function

  1. Jan 23, 2005 #1

    Ive done the first part of a question which was to derive the equation

    [tex]\displaystyle{\theta(t) = \theta_0 \sin(\omega_0t + \phi)}[/tex]

    for a pendulum

    where [tex]\displaystyle{\omega_0 = \sqrt{\frac{g}{r}}}[/tex] and [tex]\displaystyle{\phi = \sin^{-1} \left(\frac{\theta_1}{\theta_0}\right)}[/tex]

    [tex]r = \mbox{length of rod (pendulum)}[/tex]

    The next part says

    Sketch [tex]\theta(t)[/tex] versus [tex]t[/tex] for the cases [tex]\phi = 0[/tex] and [tex]\displastyle{\phi = \frac{\pi}{2}}[/tex]

    How do I do this if i dont know [tex]\theta_0[/tex] or [tex]r[/tex]? I know they are both constant though, does this have a bearing on the situation?

    Last edited: Jan 23, 2005
  2. jcsd
  3. Jan 23, 2005 #2


    User Avatar
    Science Advisor
    Homework Helper

    1.There's a typo in the first formula.A "t" is missing in the (round) bracket...

    2.The graph is basically a streched (on "y") sinusoid...So it ain't a big deal to draw it.You have to determine the amplitude,the zeros and that's it...

  4. Jan 23, 2005 #3

    Ok, so im just basically sketching it and trying to make it look nice

    I think i can do that :smile:

    Thanks again
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook