Adrillstring is composed of 9000 ft of 5-in. 19.5-lbm/ft drillpipe and 1000 ft of drill collars having a 8.0-in. od, 3.0-in. id. compute: a) capacity of the drillpipe in barrels. b) capacity of the drill collars in barrels. c) number of pump cycles required to pump surface mud to the bit. the pump is a duplex double acting pump with 6-in. liners, 2.5-in. rods, 16-in. strokes, and operates at a volumetric efficiency of 85%. d) displacement of the drillpipe in bbl/ft. e) displacement of the drill collars in bbl/ft. the od of the collars is 8.0-in