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A 250 cubic meter reaction tank contains a waste water having an ultimate BOD concentration of 755 mg/L. If the BOD reaction rate constant is -0.352/day, how much BOD is remaining after 12.0 days?
Calculate the compressive stress (in psi) for a 6-in diameter by 12-in high concrete test specimen if the total deformation under load is 0.015 in. Calculate the total load on the test cylinder stress.
he oxygen is compressed from 95 kPa, 20 C to 300 kPa, isothermally. Determine the heat transfer assuming (a) the process is reversible, (b) the process is irreversible such that 20% more work is required than the reversible case.
A 1.0 × 106 gallon reactor is used in a sewage-treatment plant. The influent biochemical oxygen demand (BOD) concentration is 100 mg/L, the effluent BOD concentration is 25 mg/L, and the flow rate through the reactor is 500 gal/min.
An unconfined compression test was conducted on a compacted soil sample, 50 mm diameter by 100 mm long. The peak axial force recorded was 230 N and the sample shortened by 2 mm.
determine the torsional buckling stress for the compression member if the length is 4m and cross section is the form shown. the ends are restrained such that there are not free to warp.given A:5646mm2 Ix:42.63Mmm4 Iy:14067Mmm4 E:210kN/mm2 G:80kN/m..
a brass ring of 120-mm outside diameter is fits exactly inside a steel ring of 120-mm inside diameter when the temperature of both rings is 5 degrees C. knowing that the temperature of the rings is then raised to 55 degrees C
The block is acted by its weight W=200 lb, a horizontal force Q=600 lb, and the pressure P exerted by the inclined plane. The resultant R of these forces is up and parallel to the inclined thereby sliding the block up it. Determine P and R.
Base isolation technique has become the method of choice for structural design of buildings and bridges located in highly seismic areas in recent years.
Water at a flow rate of 1 kg/s is flowing in a pipe of internal diameter 5 cm. If the inside pipe surface temperature is 90 degrees C and mean bulk water temperature is 50 degrees C
A 10-mm diameter bar of 1040 carbon steel is subjected to a tensile load of 50,000 N, taking it beyond its yield point. Calculate the elastic recovery (or strain) that would occur upon removal of the tensile load.
Given that the gate is 3 m wide and will just start to open when water height reaches 6 m, determine the weight of the gate.
Consider the flow field where angular velocity w is equal to 2pi rad/s ( a physical frequency of 1 Hz). Is this flow field compressible or incompressible
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