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Homework Help: Planar motion

  1. Apr 25, 2009 #1
    1. The problem statement, all variables and given/known data
    A guide with a vertical slot is given a horizontal motion of x=200cos(0.3t), where x is in mm, t is in seconds and (0.3t) in radians. The guide controls the motion of pin P, which is also constrained to move along a fixed parabolic slot as shown below. The parabolic slot has a shape given by the equation y=x(squared)/200, where y is in mm.

    For the instant where t=6.0seconds,

    (a) Determine the position, velocity and acceleration of P in X-Y components.

    (b) Determine the rate at which the speed of P is changing.

    (c) Determine the instantaneous radius of curvature of the path.

    Im just stuck on part c

    2. Relevant equations

    a=v.t+ v^2/p

    3. The attempt at a solution
    Part a = done

    Part b=done

    Part c have no clue where to start
  2. jcsd
  3. Apr 25, 2009 #2
  4. Apr 26, 2009 #3
    could point me in the right direction using n-t coordinates

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