A rectangular channel is 400 ft wide and the normal depth is 10 ft with an average velocity of 5 fps. A roadway is to cross the channel using a bridge with equal encroachments from each side. Determine the water depth at Section 2 and 3 for bridge lengths (B) of 100, 150 and 200 ft. What is the maximum length of bridge that will cause critical depth to occur in the constriction? Neglect headloss and channel slope.

Amass of 1.5 kg of air at 120 kpa and 24°c is contained in a gas-tight, frictionless piston-cylinder device. the air is now compressed to a final pressure of 720 kpa. during the process, heat is transferred from the air such that the temperature inside the cylinder remains constant. calculate the boundary work input during this process.

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

An ideal otto cycle with air as the working fluid has a compression ratio of 8. the minimum and maximum temperatures in the cycle are 300 k and 1340 k. use constant specific heats at room temperature to determine (a) the amount of heat transferred to the air during the heat- addition kj/kg, (b) the thermal efficiency, and (c) the thermal efficiency of a carnot cycle ope limits. process, in rating between the same temperature