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A company has been discharging its waste into a holding pit for a long time. For the last several years, the pit has been full and overflowing into a local river. The waste concentration has been nearly constant at 10 mg/L of the pollutant of interest. At this concentration, there have been no adverse effects on the stream. Suddenly, there is a process change and the contaminant in the waste stream goes up to 100 mg/L. Given that the waste stream flow rate is 100,000 L/day and the holding pit volume is 1.0 million liters, determine the concentration of the pit's overflow stream after 10 days.
An insulated system contains two solid blocks in contact with each other; one hot and the other cold. After heat transfer over some time, thermal equilibrium is established in the container.
In what direction did the cue ball move after the collision? What percentage of its kinetic energy did the cue ball impart to the eight ball?
The General Hospital is evaluating new office equipment offered by three companies. The interest rate is 8%. Company A Company B Company C Cost $500 $600 $700 Annual benefit 130 115 100 End of useful life salvage value 0 250 180 Useful life (yrs) 5 5..
Calculate the energy released per 42He nucleus produced and per mole of 42He produced. The atomic masses are 21H, 2.01410, 31H, 3.01605, and 42He, 4.00260. The masses of the electron and neutron are 5.4858 10-4 and 1.00866 amu, respectively.
diameter spaced longitunally every 6 in. Knowing that the average allowable shearing stress in the bolts is 10.5 ksi, determine the largest allowable vertical shear in the beam.
The vertical effective stress at a certain point in a loose sand is 1000lb/ft^2. If an earth quake were to occur, how much excess pore water pressure would need to develop at this point for liquefaction to occur? Show a numerical rationale for your a..
an eight lane urban freeway four lanes in each direction is on rolling terrain and has 11-ft lanes with a 4-ft
The factor of safety is defined as the ratio of the stabilizing moment divided by the overturning moment. The densities of concrete and water are = 2.40 and = 1 , respectively. Assume that the dam does not slide.
A 2,400 foot long, 2 foot diameter pipline conveys water from ahilltop reservoir to an industrial site. The pipe is made of ductile iron, has an outside diameter of of 2.25 feet, and has expansion joints.
A composite beam is made by attaching the timber and steel portions with bolts of 14-mm diameter spaced logitudinally every 200 mm. The modulous of elasticity is 10 GPa for the wood and 180 GPa for the steel.
(a) Calculate the annual costs ($/yr) of meeting the proposed effluent requirement of 0.1 mg P/L using alum to precipitate AlPO4(s). Assume the chemical formula for alum is Al2(SO4)3·18H2O (MW = 666).
An aerosol with a lognormal size distribution has a count median diameter of 2.0 micron and a geometric standard deviation of 2.2. If the mass concentration is 1 mg/cubic meter what is the number concentration
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