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Simple dynamics question, answer seems incorrect...

  1. Jul 14, 2016 #1
    1. The problem statement, all variables and given/known data
    H7virgC.png

    2. Relevant equations
    f=m*a
    V= Vg*cos θ

    3. The attempt at a solution
    Is this solution correct. I did everything the same, but I did not use the 15 ft/s.
    Since An= (v^2/ρ) with V being the velocity in the t direction. The 15 ft/s according to me is only the component of V that is in the y direction of a normall x-y plane.
    So to get the velocity in the tangential direction of the path, so the full V. You need to do 15 ft/s / cos θ?
    That they use Vg as V in the equation for An is wrong?
     
  2. jcsd
  3. Jul 14, 2016 #2

    TSny

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    Homework Helper
    Gold Member

    Apparently the 15 ft/s given in the problem is meant to be the tangential speed. "Downward" is just meant to indicate that the boy is "swinging down" at this instant.

    I understand how you interpreted it, and you would be correct for your interpretation. The wording of the statement of the problem could have been better.
     
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