Question: A vertical pole of solid circular cross section is twisted by horizontal forces P = 1100 lb acting at the ends of a horizontal arm

A vertical pole of solid circular cross section is twisted by horizontal forces P = 1100 lb acting at the ends of a horizontal arm AB (see figure). The distance from the outside of the pole to the line of action of each force is c = 5.0 in.
If the allowable shear stress in the pole is 4500 psi, what is the minimum required diameter dmin of the pole?

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