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1.If the half-life of a chemical compound is 30 days under anerobic conditions, determine the first-order removal-rate constant, k
2.A simply supported beam with a pin support at A and a roller support at B with length L=20 ft has a force P=10 kips applied at x=15 ft from point A. What are the reactions at A?
3.Determine the number of additional deaths per year occurring in apopulation of 300 million people from motor-vehicle accidents.Assume the annual risk of dying in a motor vehicle is 2.4 x10-4. Calculate the number of deaths over an averagelifetime of 70 years
4.Suppose drinking water contains 5 mg/L of phenol, 0.5 mg/L of xylene, and 0.35 mg/L acetone. If a 70-kg adult drinks 2 liters per day of this water for 20 years, calculate the hazard index and discuss whether this is a safe level of exposure.
It is proposed to make a new pedestrian access running directly south from University Square to Silvertown. The physical barriers that need to be overcome are the Royal Docks and the City Airport runway.
An elbow, 90 degrees smooth bend flanged, is used in the Alaskan pipeline. Inside pipe diameter is 48 inches. Flow is 1.6 million barrels a day. 1 barrel=42 gal. Velocity is 8.27 ft/s. SG=0.93
A 30 feet column is braced at the mid-section to prevent premature failure. If the maximum load is 380 kips, select an appropriate W14 section, if any, to support the loading conditions.
Derive an expression relating effluent concentration to influent concentration, hydraulic residence time, and the reaction rate constant for a zero order reaction in a CSTR at stead-state.
If the tanker truck discharges into the top of the tank with no vapor control, the emission of gasoline vapors is estimated to be 2.75k*m^-3 of gas delivered to the tank.
Determine the the max weight of the block that the system does not fail if the max tension that can be developed in cable DB is 100N and the max compression that can be developed in tower CD is 100N.
A 40 cm diameter well has been constructed in a water-table aquifer. A pump capable of continuous discharge at 600 m3/day has been installed to test the well. Observation wells are located 10 meter and 50 meters from the pumped well. After pumping co..
The Metrodome's inflatable roof covers 10.0 acres and its interior volume is 60.0x103 cubic feet. During construction, 40.0x103cubic yards of concrete, 11.9x103 tons of reinforcing steel, and 5.00x102 tons of structural steel were utilized.
A 4 meter long steel plate with a rectangular cross section (10mm x 50mm) is resting on a frictionless surface under the sun. The plate temperature is measured to be at 40 degrees Celsius.
The car was travelling on a 3% upgrade on a pavement with friction factor of 0.30. How much further would the car have skid if it did not strike the concrete barrier?
Water at 120 celcius with a quality of 25 % has its temperature raised 20 celcius in a constant volume process. What is the new quality and pressure? Draw P-v and T-s diagrams.
What do you understand by the term durability? Compared to other considerations, how much importance should be given to durability in the design and construction of concrete structures?
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