Acommonly used unit of mass in the english system is the pound-mass, abbreviated lbm, where 1 lbm = 0.454 kg. what is the density of glycerine in pound-mass per cubic foot? (assume the density of glycerine is 1.26 ✕ 103 kg/m3.)

Total solidification times of three casting geometries are to be compared: a sphere, a cylinder, in which the length-to-diameter ration - 1.0, and a cube. volume = 1000 cm^3 for all three shhapes, and the same casting alloy is used. a) determine the solidification times of each geometry b) based on the results of part (a), which geometric element would make the best riser? c) if the mold constant = 3.5 min/cm^2 in chvorinov's rule, compute the total solidification time for each casting.