A washing machine spins its drum at 1200 rpm.  If the diameter of the drum is 35 cm, find:

(a)    the angular velocity of the tub                                                                            

(b)   the linear speed of the rim of the tub.                                                            

(a) 1200 rpm = 20 revolutions per second

Þ w = 20 ´ 2p = 126 rad/s

(b) Remember to turn the diameter to the radius.  Radius r = 35 cm ¸ 2 = 17.5 cm  = 0.175 m

Þ v = rw = 0.175 m ´ 126 rad/s = 22 m/s