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A river with 400 ppm of salts (a conservative substance) and an upstream flow of 25 m^3/s receives an agricultural discharge of 5.0 m^3/s carrying 2000 mg/L of salts. The salts quickly become uniformly distributed in the river. A municipality just downstream withdraws water and mixes it with enough pure water (no salt) form another source to deliver water having no more than 500 ppm salts to its costumers. What should be the mixture ratio of pure water to river water?
clay was extracted from a soil sampling tube to form a cylindrical sample 100 mm in diameter and 100mm in length.the sample was weighed in its natrual moist state and found to have a total mass of 1531g.
a gate of 10 ft width and 5 ft long is hinged at point a and held in place by 12 ft long brace as shown in fig. as the
What would the B/C ratio be if the light poles were twice as far apart as assumed above?
Determine the diameter of glass tubing that is necessary for the capillary rise to be less than 0.5 mm. Assume the fluid is water with surface tension equal to 0.0728 N/m and specific weight equal to 9800 N/m3
Find the limiting length of an offset so that the displacement of a point on paper is may not exceed 0.025 centimetres.The offset was laid 3 degree out from it's true direction and the scale was 10m to 1cm.
A monorail train starts from rest on a curve of radius 400 m and accelerates at the constant rate a_t. If the maximum total acceleration of the train must not exceed 1.5 m/s^2, determine
Write the mass balance equation for a plug flow with a second order decaying substance,C. Solve for the steady state concentration of C as a function of the second order rate constant k, longitudinal distance x, mean velocity u, and the concentrat..
The 800 mm diameter shaft is made of A-36 steel. If it is subjected to the uniform distributed torque of 5kN*m/m, determine the angle of twist of end A with respect to B.
Air can be assumed as a di-atomic ideal gas. Find the final temperature and the amount of work ( in kW) required for air compression at a rate of 100 mol/s , from an initial condition of 1 bar an 25 C to 10 bar; for the following ways.
Your company is considering the purchase of new earth moving equipment. The total purchase is $240,000 and we pay with $100,000 cash and borrow the rest. (12% per year nominal, compounded monthly for 5 years).
The crane hoists a uniformly distributed load C. the two identical motors at A an power through gearboxes operating at maximum output speed of 100 rpm.the load is lifted by winding cable onto spindles attached to the output shaft of each gear box.
The aluminium wire has a radius of 1.1mm. What must be the radius of the steel wire if it is to stretch the same distance as the aluminium wire, so that the two wires maintain equal lengths after the masses are attached?
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