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Advanced SHM?

  1. Sep 5, 2014 #1
    I have a homework problem I need help with. I don't want the answer given to me since I know I can answer it with the proper guidance.
    How should I approach this problem?

    ImageUploadedByPhysics Forums1409893185.944767.jpg

    This is what I have so far. How should I approach this? Did I start off right?
    ImageUploadedByPhysics Forums1409893621.787673.jpg
    Thanks in advanced!
  2. jcsd
  3. Sep 5, 2014 #2
    Sorry thought this was the homework section
  4. Sep 5, 2014 #3


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    Science Advisor
    Gold Member
    2017 Award

    hi there

    can you please rotate and repost your images so I don't have to lie down to try and read them :)


    PS have asked for it to be moved to homework section
  5. Sep 5, 2014 #4


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    Gold Member

    We have:
    [itex] x=\alpha \cos{(\omega t-\phi)} \Rightarrow \dot x=-\alpha \omega \sin{(\omega t-\phi)} [/itex]
    Let's take [itex] \delta=\omega t-\phi [/itex], then we can write:
    [itex] \sin^2 \delta+\cos^2 \delta=1 \Rightarrow (\frac{\dot x}{\alpha \omega})^2+(\frac{x}{\alpha})^2=1 [/itex].
    Is it enough or I should explain further?
  6. Sep 5, 2014 #5

    Mhmm let me see what I can extrapolate from this. Give me a moment... Thanks btw.
  7. Sep 5, 2014 #6

    Okay! I will take a better picture!
  8. Sep 5, 2014 #7


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    Staff: Mentor

    Since this has been reposted in the HW section, I will close this thread.
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