# 73. A hoop of radius R rotates at constant an- gular velocity 12. A small bead...

###### Question:

73. A hoop of radius R rotates at constant an- gular velocity 12. A small bead of mass m is attached to the hoop, with a frictional force on the bead proportional to the dif- ference in velocity between the bead and edge of the hoop, F = k(RS2 - Rw), where w is the angular velocity of the bead. If the bead begins at angular velocity wo, which of the following describes its subsequent motion? (A) w(t) = woe-kRt/m (B) w(t) = N - woe-kRt/m (C) w(t) = 12 - woe -mRt/ (D) wat) = (1 - e-kRt/m) (E) w(t) = 12 - (12 - wo)e-kRt/m

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