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If biodegradable organic matter, oxygen, and microorganisms are placed in a closed bottle, the microorganisms will use the oxygen in the process of oxidizing the organic matter. The bottle may be treated as a batch reactor (no inflows or outflows), and the decay of oxygen may be treated as a first order reaction. write general mass balance equation for the bottle.Calculate and then plot the concentration of oxygen each day for a period of 5 days starting with a concentration of 8 mg/L. Use a rate constant of 0.35 d-1.
an investment of $80,000 is projected to generate escalated dollar net revenues (income minus costs) of $10,000 in year one, $30,000 in year 2 and $40,000 in year 3 with a $100,000 salvage value at the end of year
Assume that 200 g is the equivalent mass of the stick concentrated in the blade which contacts the puck. The coefficient of restitution of between puck and blade is 0.6. Find the velocity of the blade of the stick
an equal-tangent crest vertical curve has a 50 mih design speed. the initial grade is 3. the high point is at station
The company will use an annual interest rate of 10%. Annual maintenance and pumping costs may be considered to be paid in their entireties at the end of the years in which their costs are incurred.
a cm reactor receives influent containing 10.0 mgl of tracer for 2 h. then tracer addition is terminated but the flow
problem 1. a single-storey factory is composed of a number of steel truss structures as shown in the following figure.
Determine the length of roadway that is in full superelevation for a four-lane expressway with a 60 mph design speed. The BC of the curve is at station 15+00 and has a minimum allowable radius. The curve delta is 25 degrees and 30’.
A non-reactive chloride solution is continuously discharged into an aquifer. The concentration at the discharge location is 800 mg/L. Determine the maximum concentration of chlorides to be observed at an observation well 30 m downstream of the disc..
A system consists of a gas confined between a cylinder and piston such that work and heat may cross the boundary. What type of system is that? What type of system is a free body as used in mechanics or civil engineering? What type of system would you..
A random sample of 50 suspension helmets used by motorcycle riders and automobile race- car drivers was subjected to an impact test, and on 18 of these helmets some damage was observed.
A bus line 4 miles long runs through an area with 1/6 acre lots,3.5 people per household, average 1 car per household. People will walk up to 1/6 mile to a bus stop, so stops are located 1/3 mileapart along the route.
Water seeps vertically downward from the bottom of a lake through a uniform material to an aquifer below. The discharge is 0.005 ft^3/s through a 1 ft^2 area of the lake bottom.
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