4. When removing a wheel to change a flat tire, a driver applies an equal force (P = 25lb) at the ends of two of the arms of a lug

wrench (see figure below). The wrench is made of steel with a shear modulus of elasticity G=11.4x10^6 psi. Each arm of the wrench is 9.0in. long and has a solid circular cross section of diameter d=0.5in. а.Determine the maximum shear stress in the arm that is turning the lug nut (arm A) b. Determine the torsional deflection (in degrees) of this same arm