A medium hydraulic excavator will be used to dig a trench in hard clay. The minimum trench size is 36 in. wide with an average depth of 5 ft. The excavator bucket available is 38 in. wide and has a heaped capacity of 2.0 cu yd. The maximum digging depth of the excavator is 16 ft. The average swing angle is expected to be 85 degrees. Estimate the productivity in BCY and hourly trench production in linear ft if job efficiency is 85%.

For the closed feedwater heater below, feedwater enters state 3 at a pressure of 2000 psia and temperature of 420 °f at a rate of ix10 ibhr. the feedwat extracted steam enters state 1 at a pressure of 1000 psia and enthalpy of 1500 btu/lbm. the extracted er leaves at an enthalpy of 528.7 btu/lbm steam leaves as a saturated liquid. (16) a) determine the mass flow rate of the extraction steam used to heat the feedwater (10) b) determine the terminal temperature difference of the closed feedwater heater