A horizontal cantilever projects 80 mm from its clamped point. The cantilever has a uniform cross-section of 40 mm by 20 mm. If a force of 50 kN is applied vertically at the free end of the...

A horizontal cantilever projects 80 mm from its clamped point. The cantilever has a uniform cross-section of 40 mm by 20 mm. If a force of 50 kN is applied vertically at the free end of the cantilever, in the plane of the end face, what is (a) the shear stress, (b) the shear strain? The shear modulus is 76 GPa.