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Write the mass balance equation for a completely mixed lake with an impulse input of mass, M, added at time t = 0. Assume the lake is of constant volume, V, with continuous outflow, Q, and a conservative substance. Solve for the outlet concentration in terms of the initial concentration C0, the mean hydraulic detention time, td, and time t. Plot the normalized concentration, C/C0, versus normalized time, t/ td. How long does it take for 90% of impulse input of material to be depleted from the system?
Hardness is sum of all divalent cations (meaning all species with a positive charge of 2) in a water sample. Magnesium (Mg2+) and calcium (Ca2+) are the most common divalent cations that contribute to hardness.
A hydroelectricity plant is supplied from a resevoir via a pipeline 2km long and 2.5m in diameter. The pipeline terminates at the downstream end at in a control valve. Determine the minimum surge tank size if the max allowable height
Double the width of the window, using widen, set the height of the window so that it is the same as the width, and set the title to the new value "Square Window".
A flume discharges 42.0 cfs on a slope of 0.50 ft in 1000 ft. The section is rectangular, and Manning's roughness coefficient is 0.012. Determine the best hydraulic section, i.e., the dimension for minimum wetted perimeter.
If they are sliding on a smooth horizontal plane with the velocities shown, determine their speeds just after impact. The coefficient of restitution between them is e = 0.6. Disks A and B have a mass of 16kg and 11kg , respectively.
A worker is to paint the walls of a square room 8ft high and 12 ft along each side. what surface area in square meters must she cover?
a bearing wall carries a dead load of 120kn/m and live load of 100 kn/m. It is to be supported on a 400mm deep continuous footing underlain by a medium sand (unit weight = 19.2 kn/m3, phi= 37 deg, effective c = 0).
If a logit model is estimated with coefficients of -0.543 for distance and 0.0165 for commercial space (in 1000 of ft^2), how many shopping trips will be made to each of the four shopping centers?
The plate is submerged in a liquid is a vertical position with the parallel sides horizontal and the shorter parallel side at the top and exactly in the surface of the liquid. The static moment of the plate with respect to the surface of the liqui..
Starting from x = 0 with no initial velocity, the acceleration of a race car is defined by the relation a = 6.8e-0.00057x, where a and x are expressed in m/s2 and meters, respectively. Determine the position of the race car when v = 30 m/s.
A low pass filter has a cut-off frequency of 5 kHz and a high pass filter has a cut-off frequency of 8 kHz. These two circuits are connected back to back in cascade to form an input-output system
An equal tangent vertical curve is to be constructed between grades of -3.0% (initial) and 1.0% (final). The PVI is at station 110+00 and elevation 420 ft. Due to a street crossing the roadway, the elevation of the roadway at station 112+00 must b..
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