Question: While removing a wheel to change a tire, a driver applies forces P = 25 lb at the ends of two of the arms of

While removing a wheel to change a tire, a driver applies forces P = 25 lb at the ends of two of the arms of a lug wrench (see figure). The wrench is made of steel with shear modulus of elasticity G = 11.4 ( 106 psi. Each arm of the wrench is 9.0 in. long and has a solid circular cross section of diameter d = 0.5 in.
(a) Determine the maximum shear stress in the arm that is turning the lug nut (arm A).
(b) Determine the angle of twist (in degrees) of this same arm.

0 d 0.5 in P#25 lb

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