Wednesday

April 1, 2015

April 1, 2015

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

**Answer this Question**

**Related Questions**

Physics - Know matter how i work it out, i keep getting the wrong answers. ...

Physics - Know matter how i work it out, i keep getting the wrong answers. ...

PHYSICS - Could u help with physics hw! i keep trying but i keep getting the ...

physics - ok im doing my physics homework and we have to submit the answers ...

PHYSICS PLEASE SOMEONE HELP ME OUT - When an object is placed 55.0cm from a ...

math - How do you solve this? 5x- [1.5 -3.6] [0.2 1.3] [-0.3 2.8]= [-5.6 1.7] 5x...

PHYSICS PLEASE HELP ASAP - When an object is placed 55.0cm from a certain ...

Physics Please COULD SOMEONE HELP ME ASAP PLZ - When an object is placed 55.0cm ...

Algebra - - ok... we keep getting this one wrong: Solve the following equation ...

Physics - Vector a has a magnitude of 5 m and is directed esast. Vector b has a ...