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Homework Help: Simple Harmonic Motion Typical Problem

  1. Dec 13, 2012 #1
    Hi friends the problem is -


    Attempt -

    As per the problem states,

    The net force on the particle will be ,


    which is giving no way to get the answer as per the question.

    The correct answer of this problem is option (B), (∏/3) as per the question.

    Please friends help me in solving this Problem.

    Thank you all in advance.
  2. jcsd
  3. Dec 13, 2012 #2


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    I think you need to interpret the notation carefully. A and B are points along a line that are considered fixed. A and B do not have numerical values, they are just labels for the two points. P is also a label for some arbitrary point on the line. The notation [itex]\overline{PA}[/itex] denotes a vector pointing in the direction from point P to point A with magnitude equal to the distance between P and A. Similarly for [itex]\overline{PB}[/itex].

    A force of [itex]2\overline{PA}[/itex] denotes a force pointing in the direction from P to A and magnitude 2 times the distance between P and A. The "2" should be thought of has having units so the force comes out in units of N.
  4. Dec 14, 2012 #3
    Thanks a lot TSny I got its answer too.
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