Posted by donald on Thursday, December 29, 2011 at 3:28pm.
Ac = w^2 r
w = 2 pi radians/1.5 seconds = 4.19 radians/second
Ac = 4.19^2 * .75 = 13.2 m/s^2
Fin = m Ac = 25*13.2 = 329 Newtons
Fup = m g = 25 * 9.81 = 245 Newtons
magnitude of force = sqrt(329^2+245^2)
tangent of direction up from horizontal = 245/329
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