17.11 a piece of corroded metal alloy plate was found in a submerged ocean vessel. it was estimated that the original area of the plate was 800 cm2 and that approximately 2.6 kg had corroded away during the submersion. assuming a corrosion penetration rate of 200 mpy for this alloy in seawater, estimate the time of submersion in years. the density of the alloy is 7.9 g/cm3

The air in an automobile tire with a volume of 2.60 ft3 is at 70°f and 21 psig. determine the amount of air that must be added to raise the pressure to the recommended value of 30 psig. assume the atmospheric pressure to be 14.6 psia and the temperature and the volume to remain constant. the gas constant of air is ru = 53.34ft⋅lbflbm⋅r(1 psia144 lbf/ft2) = 0.3704 psia⋅ft3lbm⋅r the amount of air that must be added to raise the pressure is lbm