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Chromate waste is concentrated by evaporation in a series of shallow flow through reactor tanks connected by a short length of pipe. The first tank in the series has a volume of 4500 ft3. The evaporation rate is about 1/16 of the volume of each tank. Assume that CrO42- does not volatilize (i.e., it remains with the liquid water at all times) and is conservative. If both tanks are well-mixed and remain at constant volume, what is the steady-state concentration (in mg/L) of chromate (CrO42-) in the effluent water leaving the second tank?
A falling-head permeability test was carried out on a clay soil of diameter 100 mm and length 150 mm. In 4 minutes the head in the standpipe of diameter 5mm dropped from 680 to 350 mm.
determine the velocity and acceleration of point C of the belt, (a) immediately before the power is turned off. (b) 9 s later.
the triangular plate ABC is supported by ball and socket joints at B and D and is held in the position shown by cables AE and CF. If the force exerted by cable AE at A is 1000N , determine the moment of the force about line joining points D and B.
On a flexible pavement with a 3 inch hot mix asphalt (HMA) wearing surface, a 6 inch soil cement base and an 8 inch crushed stone subbase, which truck will cause more pavement damage?(Suppose drainage coefficients are 1.0).
Cancer is the uncontrolled growth of abnormal cells in the body resulting in tumours that can be benign or malignant (cancerous cells). A proper treatment is necessary to fight with this serious disease.
A body slides down a frictionless plane and during the third second after starting from rest if it travels 20.4m. What is the angle of inclination of the plane?
Does the presence of Mg2+ significantly interfere with the determination of Ca 2+ by the EDTA titration?
Calculate the force (in Kn) a punch press must exert if it is to punch out a large washer from a strip of 5-mm thick sheet steel with an ultimate shear strength of 400 MPa.
How would you define the coefficient of permeability? Give typical values of the coefficient for: a) fresh cement pastes; b) hardened cement pastes; c) commonly used aggregates;
The total dissolved inorganic carbon (TIC) of a sample of groundwater is 8.33 mM. The temperature of the aquifer is 15C, the pH is 7.5, and the ionic strength is 0.05 M. What is the H2CO3, HCO3-, CO3 2-, and the partial pressure of CO2? [Use activ..
Design the roof slab as a one-way slab system and use the worst case design scenario to determine the reinforcing for the entire roof
Draw the shear diagram for the shaft. The bearings at and exert only vertical reactions on the shaft
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