Hey,

Can someone tell me which is the correct equation for stokes law as ive seen two totally different ones which confuse me alot.

The first is here:

The Second is here:

They both seem to be the same apart from the first has a couple of extra varibles in, also if the first equation is the one i should be using, could someone tell me which units everything should be in and what units the answer will be in.

Thanks for any help. Jack

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