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7. The spool, which has a mass of 2 kg, slides along the smooth horizontal spiral rod, r = (0.40) m, where
is in radians. If its angular rate of rotation is constant and equals 0-6 rad/s, determine the horizontal
tangential force P needed to cause the motion and the horizontal normal force component that the spool
exerts on the rod at the instant = 45°.
[Ans: P = 17.8 N and N = 59.3 N].
= 6 rad/s

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