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1. A waste has an ultimate CBOD of 1,000 mg/L and a kL, of 0.1 day-1. What is its 5-day CBOD?
2. Calculate the ultimate BOD of a waste that has a measured 5-day BOD of 20 mg/L, assuming a BOD rate coefficient of 0.15 day-1.
3. A waste has a ThOD of 500 mg/L, a COD of 48 mg/L, and an ultimate CBOD of 5 mg/L Offer an explanation for the character of this waste.
A computer chip dissipates 2 Btu of electrical work over time and rejects that as heat transfer from its 125 F surface to 70 F air. How much entropy is generated in the chip? How much, if any, is generated outside the chip?
A 35 feet diameter oil storage tank is built on a 100 ft thick soil layer. The tank exerts an uniform pressure of 1000 pcf on the ground surface. The groundwater table is 10 ft below the ground surface.
A refrigerator should remove 1.5 kW from the cold space at -10?C while it rejects heat to the kitchen at 25?C. Find the reversible work.
IF the bulk density of coarse grained soil is 1760 kg/m^3 what is its void ratio, e, and saturation, S. Draw the complete phase body diagram and show the masses and volumes.
the outer diameter of this sleeve is 20 mm, and its inner diameter is 10 mm. if the yield stress for the steel is (sy)st = 640 MPa, and for the bronze (sy)br = 520 MPa determine the magnitude of the largest elastic load P
Three stock car drivers are racing around a circular bend. They are each circling the bend at different radii: r(1)=249 m , r(2)=255 m , and r(3)=261 m . At a given instant, all three are traveling at the same transverse rate of rotation, .259 rad/s ..
Explain why data should always be entered directly into the field book at the time measurements are made, rather than on scrap paper for neat transfer to the field book later.
determine the final pressure in the tank
What measures can be taken to prevent its occurrence?
Determine what fair amount she should receive if she decides she want to be paid: a. In 2 equal installments - one immediately (at T=0) and one at the end of month 36.
The vertical velocity of the box at the time that it hits the surface is v= 5m/s. After impact the camera experiences an acceleration of a = -kx, where k is a constant and x is the compression of the packing material.
If it is originally a distance ? from the surface of its end support, determine the length a that rests on this support when it is subjected to the uniform load w0, which is great enough to cause this to happen.
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