A spherical particle with SG ¼ 2.5 and a diameter of 2 mm is immersed in water in a cylindrical centrifuge with has a diameter of 20 cm. If the particle is initially 8 cm above the bottom of the centrifuge and 1 cm from the centerline, what is the speed of the centrifuge (in rpm) if this particle strikes the wall of the centrifuge just before it hits the bottom?
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