Shaft shear stress when horsepower, speed and shaft diameter are known

Short
Long $Formula for [Ss] = {[HP] * 321000} / {[N] * [D_S]^3}$ $Formula for [Ss] = {[HP] * 321000} / {[N] * [D_S]^3}$

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Input 3 of 4 variables to solve for the unknown.			Help
Symbol	Variable	Input	Units
Ss	Shaft Sheer Stress
HP	Horsepower
N	RPM
D_S	Shaft Diameter
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