# A Faxen's 2nd law

1. Oct 23, 2016

### RobosaurusRex

Can someone show me how Faxen's 2nd law for the viscous torque on a rotating sphere comes to be?

I know tau_(r phi) = -3 mu Omega sin(theta)

Torque is integral of vec(r) cross vec(f)

But I can't get the right answer so I am doing something very wrong

Help?

2. Oct 25, 2016

### Staff: Mentor

This talk may help explain it better:

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