Steel balls 12 mm in diameter are annealed by heating to 1150 k and then slowly cooling to 400 k in an air environment for which t 325 k and h 20 w/m2 k. assuming the properties of the steel to be k 40 w/m k, 7800 kg/m3, and c 600 j/kg k, estimate the time required for the cooling process.

The results of huy's eye exam show that he is nearsighted. which explanation should huy expect to hear? "you need convex lenses to shorten the distance that light takes to focus in your eyes." "you need concave lenses to shorten the distance that light takes to focus in your eyes." "you need convex lenses to lengthen the distance that light takes to focus in your eyes." "you need concave lenses to lengthen the distance that light takes to focus in your eyes."