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Homework Help: Polar coordinates

  1. Feb 19, 2013 #1
    1. The problem statement, all variables and given/known data

    In the attachment, I do not understand how we got the second equation in terms of polar coordinates.

    2. Relevant equations

    3. The attempt at a solution

    I tried doing it by writing z_dot = (......)z and then plugging in r* exp i theta, but to no avail.

    Attached Files:

  2. jcsd
  3. Feb 19, 2013 #2


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    Science Advisor
    Homework Helper

    Show how you tried it. z'=r'e^(iθ)+iθ're^(iθ). Try going straight from the "complex notation" to the "polar notation". Divide both sides by e^(iθ) and equate real and imaginary parts.
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