You are given a channel that is rectangular with the following values: n = 0.015, b = 15’ and q = 1040 cfs. calculate the height of the step that will cause the flow to be critical when the depth upstream of the step is 4.0 feet.

Areheat rankine cycle operates with water as the working fluid. steam enters the first turbine at 8 mpa and 450°c and exits at 0.8 mpa. it is then reheated to 400°c before entering the second turbine, where it exits at 10 kpa. if the amount of work into the pump is 8.04 kj/kg and the net work per cycle produced is 1410.25 kj/kg, determine the thermal efficiency of the cycle.