A50 meter wide rectangular channel is carrying a flow of 250 m3/s
at a flow depth of 5 meters. to produce critical flow in this
channel, determine
a.) the height of the step in the channel botom if the width
remains constant.
b.) the reduction in the channel width if the channel-bottom level
remains unchanged.
c.) a combination of the width reduction and the bottom step.

Liquid flows at steady state at a rate of 2 lb/'s through a pump, which operates to raise the elevation of the liquid 100 ft from control volume inlet to exit. the liquid specific enthalpy at the inlet is 40.09 btu/lb and at the exit is 40.94 btub. the pump requires 3 btu/s of power to operate. if kinetic energy effects are negligible and gravitational acceleration is 32.174 tt/s, the heat transfer rate associated with this steady state process is most closely 1)-2,02 btu/s from the liquid to the surroundings 2)-3.98 btu/s from the surroundings to the liquid. 3)-4.96 btu/s from the surroundings to the liquid. 4)-1.04 btu/s from the liquid to the surroundings.