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1.Upstream of a discharge point, a stream has a discharge of 400 cfs and a BOD5 of 12.5 mg/L. A pipe discharges 150 gpm of water containing 120 mg/L of BOD5. What is the downstream BOD5?
2.A batch system is assumed to be first order. The initial concentration is 225 mg/L. If the reaction rate constant is 0.65 hr^-1, how long will it take for the concentration to be one-quarter the starting concentration?
3.If 5 mg of NaOCl are added to one liter of water and the pH is measured to be 7.8, what is the concentration of hypochlorite ion (OCl-) in mg/L?
4.Apoint charge of -4.00 nC is located at (0,1.00) m . what is the x component of the electric field due to the point charge at (4.00, - 2.00) m ?
Estimate the force on the chimney and the bending moment at the bottom of the chimney. You may assume that the effect of the wind on the first 1 m height of the chimney has a negligible effect on the force and the moment.
What is the cost breakdown structure(CBS)? What are its purposes? What is included (or excluded)? How does it relate to a work breakdown structure (WBS)?
Determine the discharge of a trapezoidal concrete channel section with a bottom width of 4 ft and side slopes of 2:1. The depth of flow is 5 ft and the channel slope is 0.5%
During a BOD test, 2 mL of waste water having a DO of 0 was mixed with 298 mL of dilution water having a DO of 8.9 mg/L. After 5 days and 20 days, it was noted that the DO of the test bottle was 4.0 and 2.5 respectively
What other disorders besides VSD can produce a systolicmurmur? How can character of the murmur and pattern of radiation beused to differentiate among these etiologic factors?
Determine the carburizing time necessary to achieve a carbon concentration of 0.35 wt% at a position 2 mm into an iron-carbon alloy that initially contains 0.10 wt% C.
A rear-wheel-drive car 2600 lb, has an 80-inch wheelbase, a center of gravity 20 inches above the road surface and 30 inches behind the front axle, a drivetrain efficiency of 85%, 14-inch-radius wheels,
during construction of the surface layer of asphalt pavement, two samples where taken everyday to measure the asphalt content in the mix to ensure that it is within the specification limits. the target value was set at 5.5 percent with a tolerance..
Weather records for a certain region indicate that there is a tendency for two hot summers to occur in a row. From the statistics for the region, the following information has been es tahlished
Given that an aircraft flying at FL350 encounters a tailwindof 35 knots and the instrument in the cockpit shows anindicated airspeed of 310 knots. What is the standard atmosphere atthis altitude?
Wishing to use pine wood in a construction project a technician finds the density of Eastern White Pine is 0.373 g/cm^3 or g/cc. What is the wood's density in pounds per cubic foot
The allowable stress in a steel shaft with an outside diameter of 1.5in and an inside diameter of 1.1in is 12,000psi. What hp can the shaft deliver at 1750rpm?
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