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%.

A2-m rigid tank initially contains saturated water vapor at 100 kpa. the tank is connected to a supply line through a valve. steam is flowing in the supply line at 600 kpa and 300 c. the valve is opened, and steam is allowed to enter the tank until the pressure in the tank reaches the line pressure, at which point the valve is closed. a thermometer placed in the tank indicates that the temperature at the final state is 200°c. determine (a) the mass of steam that has entered the tank (b) the amount of heat transfer.