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Two shallow lagoons connected in series, each having a surface area of 5 km^2 and depth of 1m, are receiving 8640 m^3/day of sewage containing 100mg/L of biodegradable contaminant. At a steady state, the concetnration of the contaminant in the effluent from the second lagoon must not exceed 20 mg/L. Assuming the lagoons are well mixed and that there are no losses or gains of water in the lagoon other than the sewage input, what biodegradation reaction rate coefficient (in day^-1) must be achieved for a first order reaction that governs the degradation of the contaminant
A trapezoidal channel having bottom width of 8 m and side slopes of 1 : 1, carries a discharge of 80 m^3/s. Find the conjugate depth to an initial flow depth of 0.75 m before the jump. Also determine the energy loss in the hydraulic jump.
a quality of water within a piston-cylinder assembly executes a carnot power cycle. during isothermal expansion the
A pipe carries 4750 LPM of crude oil at an average velocity of 2.5m/s. Estimate the inside diameter, wall thicknes and outside diameter of the pipe
A gun is aimed at point A located 15 degrees N or W. Knowing the gun forms and angle of 25 degrees with the horizontal and the max recoil force is 400 N, determine a) the x, y,z components of that force b)
Two glass capillary tubes of inside diameters of 20 and 13 microns are used to test the capillary rise in an annular cross section .The wall thickness of each capillary is 2 microns .The smaller capillary tube is inserted in the larger one so that..
The vertical effective stress at a certain point in a loose sand is 1000lb/ft^2. If an earth quake were to occur, how much excess pore water pressure would need to develop at this point for liquefaction to occur
Two solid rods AB and BC are welded together at B and loaded as shown. Knowing that d1=50mm and d2=30mm, find average normal stress at the midsection of rod AB and rod BC.
If a student mixes 500 ml of a solution containing 50 mg/l of CaCl2 with 500 ml of containing 50 mg/l of NaHco3 what will be the hardness and alkalinity of the mixture of mg/l as CaCo3
Assume the overall system is at steady-state, theflow rate is 15 L/min, the detention time is the PFR is 1.5 hours,and the decay rate of compound A is defined by a first-order ratereaction (k = 1 h-1).
Consider the following two simultaneous equations: x^2 + y^2 = 42x + 3*y + 2*y^2= 6 Which of the following is a possible solution for x and y? Answer x = -6.22 & y = 1.83 x = 6.48 & y = 0.18 x = -5.59 & y -1.38 x = 6.33 & y = -3.27
what policies were implemented during and after WW1,WW2,Cold war?
The position of a particle P moving in the horizental plane is described by r(t)= (5t^2 i +2te^0.1t j) m. Find the magnitude of the particle's position, velocity, and acceleration at time t=2 sec.
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