A simply supported beam with a length L 5 10 ft and height 7 in. is bent by couples M0 into a cir- cular arc with downward deflectiond at the midpoint. If the curvature of the beam is 0.003 ft21, calculate the deflection, d, at the mid-span of the beam and the longitudinal strain at the bottom fiber given that the distance between the neutral surface and the bottom surface is 3.5 in.