What is the normal and critical depth in a rectangular, concrete-lined channel, with b=2 m wide, X= 0.001 m/m, and Q= 1 m3/s? Assume a spillway is to be placed in this channel and the spillway will raise the flow depth 0.15 m. How far upstream will flow depth be equal the normal depth (backwater curve). The backwater curve must be presented in form of Excel spreadsheet and graphically showing the water-surface-profile-computation and the energy grade line. To compute the water-surface-profile use a value of the 1 cm of difference between Δx depths.

Explain the difference laminar and turbulent flow. explain it with the shear stress and the velocity profiles.

Heat is added to a piston-cylinder device filled with 2 kg of air to raise its temperature 400 c from an initial temperature of t1 27 cand pressure of pi 1 mpa. the process is isobaric process. find a)-the final pressure p2 b)-the heat transfer to the air.

Aloaded platform of total mass 500 kg is supported by a dashpot and by a set of springs of effective stiffness 72 kn/m. it is observed that when the platform is depressed through a distance x = 12.5 cm below its equilibrium position and then released without any initial velocity; it reaches its equilibrium position in the shortest possible time without overshoot. find the position and velocity of the loaded platform 0.10 sec. after its release. if a further load of 400 kg is added to the platform, find, i) the frequency of damped vibrations, and i) the amplitude of vibration after 2 complete oscillations, given that the initial amplitude is 15 cm.