Design a settling chamber to collect particles 50 m in diameter and 111 lb/ft in density from an air stream with a volumetric flow of 8ft/s. The cross sectional area of the square inlet is 9 ft. Assuming the gas-stream temperature is 70F such that the gas density and viscosity are 0.075 lb/ft and 1.23 x 105 lb/(ft-s) respectively. a. How long must the chamber be to give theoretical perfect collection efficiency? b. Determine the collection efficiency for 10m particles with the same density.