1. An aluminum wire has a diameter of d in. Determine the minimum diameter D of the coil in which the wire can be wound without exceeding a bending stress of 30,000 psi.
2. A 3-in.-wide by 1 2 -in.-thick board is bent to a radius of curvature of 62 in. by a bending moment of 700 lb-in. Calculate the modulus of elasticity.