High School Physics Question!

  1. Please help. I'm having difficulty with this problem. My book offers an answer but no explanation. Thanks for helping.


    I have the answer if you guys want it.
     

    Attached Files:

  2. jcsd
  3. Note that the wave is moving to the right. Hence, translate the whole curve slightly to the right to determine where point P will eventually be.
     
  4. Yes, but doesn't each point on the wave maintain it's position in the positive x direction? It's only the y component of each point which changes. Anyone else have any idea?
     
  5. Hootenanny

    Hootenanny 9,679
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    Yes, the point P oscillates only in the y direction, so as the wave moves to the right, will point P move up or down?

    ~H
     
  6. negative y hat
     
  7. Hootenanny

    Hootenanny 9,679
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    Yes, I suggest we let the OP finish of the question.

    ~H
     
  8. word...i'm still new here i.e. learning the ropes. how could we mathematically solved this question?
     
  9. Hootenanny

    Hootenanny 9,679
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    You couldn't, there is no data given (velocity/ displacement / time).

    ~H
     
  10. DaveC426913

    DaveC426913 16,222
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    This question actually somewhat ambiguous, and as such the OP might get the wrong advice and answer.

    Depending on how you interpret "point P", your answer will be different!
    a] Point P is a physical point on the rope.
    b] Point P is an imaginary point on the wave.

    Pizzasky interpreted it as a], but others interpreted it as b].

    I'm am 99.9% certain a] is correct. So, yes, follow Kudos and Hoot's guidance.
     
    Last edited: May 1, 2006
  11. Hootenanny

    Hootenanny 9,679
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    The OP said they have the correct answer, it would be helpful if he/she could post it to clear the matter up. But I agree with Dave, it is an ambiguous question, I was assuming point P is a physical point on the wave.

    ~H
     
  12. if the wave is going to the right, then shouldnt the answer be c?
    ......
    maybe im missing something
     
  13. Hootenanny

    Hootenanny 9,679
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    That is what we were discussing, I'll refer you to posts #4,5,6,7

    ~H
     
  14. The answer key gives choice C.

    Anyone care to explain? Thank you all. :wink:
     
  15. DaveC426913

    DaveC426913 16,222
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    OK. That clears up what they're asking. Point P is a physical point on the rope. Pretend it's a spot of paint.

    Now, as the wave travels down the rope, how will that spot of paint move?

    Think of this: the rope is tied off the right side to a lamppost. Your friend is off to the left, holding the rope, waving it up and down, creating the wave. (Note that the rope does not actually go anywhere - he can wave all he wants, but the rope will remain in our field of vision).

    NOW what will the spot of paint do?
     
    Last edited: May 1, 2006
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