List of top Water Resources Engineering Questions on Properties of Fluids

A 2m × 2m tank of 3 m height has inflow, outflow and stirring mechanisms. Initially, the tank was half-filled with fresh water. At t = 0, an inflow of a salt solution of concentration 5 g/m3 at the rate of 2 litre/s and an outflow of the well stirred mixture at the rate of 1 litre/s are initiated. This process can be modelled using the following differential equation:
\(\frac {dm}{dt}+\frac {m}{6000+t}=0.01\)
where m is the mass (grams) of the salt at time t (seconds). The mass of the salt (in grams) in the tank at 75% of its capacity is _____ (rounded off to 2 decimal places).
A vertical triangular area with vertex downward and attitude 'h' has its baas lying on the free surface of a liquid. The center of pressure below the free surface is at distance of
Pascal- second is the unit of
If the dynamic viscosity of a fluid is 0.5 poise and specific gravity is 0.5, then the kinematic viscosity of that fluid in strokes is
Surface tension of water
A lake has a maximum depth of 60 m. If the mean atmospheric pressure in the lake region is 91 kPa and the unit weight of the lake water is 9790 N/m\(^3\), the absolute pressure (in kPa, round off to two decimal places) at the maximum depth of the lake is \(\underline{\hspace{2cm}}\).
A fire hose nozzle directs a steady stream of water of velocity 50 m/s at an angle of 45° above the horizontal. The stream rises initially but then eventually falls to the ground. Assume water as incompressible and inviscid. Consider the density of air and the air friction as negligible, and assume the acceleration due to gravity as 9.81 m/s\(^2\). The maximum height (in m, round off to two decimal places) reached by the stream above the hose nozzle will then be \(\underline{\hspace{1cm}}\).
Is this incompressible or irrotational?
\(V = 3î + 5 xĴ\)