There are 2 routes from a rural origin to the CBD destination. The most direct route A is 21 miles with an average free flow speed of 45 mph and a capacity of 2000 cars per hour. The alternate route B is 30 miles with an average free flow speed of 60 mph and a capacity of 4000 cars per hour. As traffic increases, the time to traverse the routes is given by the following functions: I_A = I^A_o 1/(1 - V/C) and t_B = t^B_o 1/[1 - (V/C)^2]
How would you anticipate that 3000 cars wo longer distance (but faster speed) southern route and 2320 cars will uld divide themselves between routes A and B?

On a average work day more than work place firs are reorted

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?

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