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The discharge from the Renenutet sugar beet plant causes the DO at the critical point to fall to 4.0 mg/L. The Meskhenet Stream has a negligible BOD and the initial deficit after the river and wastewater have mixed is zero. What DO will result if the concentration of the waste(L_w) is reduced by 50%? Assume that the flows remain the same and that the saturation value of DO is 10.83 mg/L in both cases.
A reaction of great significant for undergraduate students is the fermentation of sugar with yeast. This is a zero order (in sugar) reaction, where the yeast is a catalyst (it does not enter into the reaction itself)
A block with an inclination of 20 degrees has a weight of 60kg, a height of 1.8m and width 1m, static friction is 0.3, what is the force needed and the height (where the force in the box should be) to pish it upwards
Suppose that the distance from the lake outlet to the withdrawal cannot be more than 20 mi. What should be the new volume of the lake?
A gas bubble is formed at the tip of a small tube which is completely immersed in a large body of liquid. The bubble remains in contact with the open end of the tube in a way that allows us to control the pressure P inside the bubble.
A high-strength steel simply supported W24 X 76 beam carries a uniformly distributed load over its entire length of 25 ft. (a) If the allowable stress is 33 ksi, what may be the value of the load, in addition to the beam's own weight
A soil sample with a water content of 14.5% and unit weight of 128.2 lb/cu. ft. was dried to a unit weight of 118.8 lb/cu. ft. without changing its void ratio. What is its new water content (in %)?
an equal tangent vertical curve is to be constructed between grades of -2.0 initial and 1.0 final .the pvi is at
An L2 steel strap having a thickness of 0.125 in. and a widthof 2 in. is bent into a circular arc of radius 600 in. Determine the maximum bending stress in the strap.
The current removal efficiency is 96% for an air flow rate through the separator equal to 18 m3/s. Due to a process change, the air flow rate is expected to increase to 22 m3/s.
The pins on the frame at B and C each have a diameter of 0.25 in. If these pins are subjected to double shear, determine the average shear stress in each pin.
A piston-cylinder device initially contains 1.4 kg saturatedliquid water at 200 C. Now heat is transferred to the water until the volume quadruples, and the cylinder contains saturatedvapor only.
A fan is to be selected to ventilate a bathroom whose dimensions are 2 m x 3 m x 3 m. The air velocity is not to exceed 8 m/s to minimize vibration and noise. The combined efficiency of the fan-motor unit to be used can be taken to be 50 percent.
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