math
posted by alice .
body of mass 7 kg moves in a (counterclockwise) circular path of radius 4 meters, making one revolution every 13 seconds. You may assume the circle is in the xyplane, and so you may ignore the third component.
how do you find the centripetal force acting on the body
how do you find the magnitude of the force??

math 
Damon
centripetal acceleration = Ac = v^2/R = w^2 R
where w (omega) is the angular velocity in radians/second
here w = 2 pi radians/13 seconds
so
w^2 R = (4 pi^2/169) 4
then F = m a = 7 (4 pi^2/169) 4
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