[cgarrison]

what is the moment of inertia of a hollow sphere with mass 5 kg and radius .5m
I know the equation is 2/3mR^2
but I don't know how to include the units

[Curlyben]

5 seconds + Google = The answer to you question (or a pointer in the right direction anyway)

[dmatos]

In general, with physics formulas, you plug the units right into the formulas. Say you're trying to find distance, and you have acceleration of 9.8m/s^2, and time of 4s:

d=1/2 a t^2
= 1/2 (9.8m/s^2)(4s)^2
= 1/2 (9.8m/s^2)(16s^2)
= 78.4m (the s^2 and 1/s^2 cancel out)

You can plug the units right into your formula as well, and get the correct units for moment of inertia out the other end.