(USCS units) A steel casting has a cylindrical geometry with diameter = 4.0 in and weight= 20 lb.It takes 6.0 min to solidify when cast. Another cylindrical-shaped casting with the

same diameter-to-length ratio weighs 12 lb. It is made of the same steel, and the same conditions of mold and pouring are used. Determine (a) the dimensions and (b) total solidification time of the lighter casting. The density of steel is given in Table 4.1.