A1-m3 tank containing air at 10°c and 350 kpa is connected through a valve to another tank containing 3 kg of air at 35°c and 150 kpa. now the valve is opened, and the entire system is allowed to reach thermal equilibrium with the surroundings, which are at 19.5°c. determine the volume of the second tank and the final equilibrium pressure of air. the gas constant of air is r = 0.287 kpa·m3/kg·k.

Air is to be cooled in the evaporator section of a refrigerator by passing it over a bank of 0.8-cm-outer-diameter and 0.4-m-long tubes inside which the refrigerant is evaporating at -20°c. air approaches the tube bank in the normal direction at 0°c and 1 atm with a mean velocity of 4 m/s. the tubes are arranged in-line with longitudinal and transverse pitches of sl- st 1.5 cm. there are 30 rows in the flow direction with 15 tubes in each row. determine (a) the refrigeration capacity of this system and (b) pressure drop across the tube bank. evaluate the air properties at an assumed mean temperature of -5°c and 1 atm. is this a good assumption?

Which of the following controllers anticipates the future from the slope of errors over time? a)-proportional b)-on/off c)-integral d)-derivative.

For a gate width of 2 m into the paper, determine the force required to hold the gate abc at its location.