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1. A population having a biomass of 2 mg/L at t = 0 days reaches a biomass of 139 at t = 10 days. Assuming exponential growth, calculate the value of the specific growth coefficient.
2. A bacterial population with a maximum specific growth rate of 1 day-1 and a respiration-rate coefficient of 0.2 day-1 will be applied in cleaning up an organic chemical spill. To quickly attain a low final steady-state chemical concentration, would a higher or lower half-saturation constant be re-quired?
Steam is flowing to a nozzle with a pressure of 400 kPa. The stagnation pressure and temperature are measured to be 600 kPa and 350?C. What are the flow velocity and temperature?
The skateboard rider leaves the ramp at A with an initial Velocity Va at a 30 degree angle. If he strikes the ground at B, determine Va and the time of the flight. x=5.1m
Now the hollow cylinder is made by drilling the hole in the center of the known cylinder. So how tocalculate the bulk modulus of hollow cylinder using theknown bulk modulusof the cylinder?
Your home town is growing so rapidly that another water tower is necessary to meet the needs of the community. Civil and environmental engineers predict that the water tower will need to hold 1.00 X 10.0^6 kilograms of water.
The James Rives flows in from the East at 320 m^3/min and joins the Jackson River flowing at 605 m^3/min just outside the town of Charlotte, NC. The concentration of BOD in the James River is 14 mg/L
How long will it take for 99 percent of the chemical to be destroyed? (c) How long will it take for 99.9 percent of the chemical to be destroyed?
Water flows through a pipe at 14cfs. At a point where the pipe diameter is 18in. the pressure is 30 psi; at a second point, further along the flow path and 2 ft lower than the first, the diameter is 9in. and the pressure is 18psi.
Water flows through a 250-mm diameter steel (C=120) pipe at a a velocity, V = 1.5 m/s. Using the Hazen-Williams equation, what is the head loss due to friction per 1000 m of pipe
An object of density P_a, volume V_a, and weight W_a is thrown from a rowboat floating on the surface of a small pond and sinks to the bottom.
What is light weight structural concrete? How does it differ from normal weight concrete? What are the advantages and disadvantages of using lightweight structural concrete?
An oedometer test on a clay soil gave the following results: Cc = 0.4, Ce = 0.08, OCR = 5. The thickness of the clay layer in the field is 2.6 m. The existing vertical effective stress at the mid-depth of the clay layer is 150 kPa. This vertical effe..
a rectangular reinforced concrete beam carries service loads on a span of 20 ft as shown. use f'c = 3000psi and fy = 60000 psi; b = 14.5 in, h = 26 in, and reinforcing is three number 10 bars.
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