e$)$ While removing a wheel to change a tire, a driver applies forces $P=100N$ at the ends of two

of the arms of a lug wrench $($see figure below$).$ The wrench is made of steel with shear modulus

of elasticity $G=78$GPa. Each arm of the wrench is $255mm$ long and has a solid circular cross

section of diameter $d=12mm.$

ii$.$ Determine the maximum shear stress in the arm that is turning the lug nut $(armA).$

vi$.$ Determine the angle of twist $($in degrees$)$ of this same arm.