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September 17, 2014

September 17, 2014

Posted by **Please Help!!!** on Sunday, March 16, 2014 at 3:18pm.

A sample of blood is placed in a centrifuge of radius 14.0 cm. The mass of a red blood cell is 3.0 x 10^-16 kg, and the magnitude of the force acting on it as it settles out of the plasma is 4.0 x 10^-11 N. At how many revolutions per second should the centrifuge be operated?

- Physics -
**Damon**, Sunday, March 16, 2014 at 3:46pmr = .14 meter

w = omega, angular rate in radians/sec

Ac = w^2 r

F = m Ac

4*10^-11 = 3 *10^-16 (w^2)(.14)

w^2 = 9.52 * 10^5 = 95.2 * 10^4

w = 9.76 * 10^2 radians/second

rev = 2 pi radians

976 rad/s * 1 rev/2pi rad = 155 rev/s

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