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Air has the following composition on a mole basis: 21 percent O2, 78 percent N2, and 1 percent Ar. Determine the gravimetric analysis of air and its molar mass.
A rectangular channel of 2 m depth and 5 m width carries 1 m deep running water. It is laid to a slope of 0.001 with Manning's n = 0.02. Some distance downstream there is a hump of height 0.5 m on the stream bed.
On average each student produces 1 kg of carbon dioxide per day. The recommended ventilation rate of fresh air to avoid excessive carbon dioxide buildup is 8 L per second per student.
Two remediation options are being considered for a contaminated land area formerly used for industrial operations. Option 1 involves removing all of the contaminated soil over a two-year period at a cost of $2.2 million per year
An intelligence data bank center requires power 24 hours a day, 7days a week. If the main power grid fails, a backup power supply isinitiated.
Suppose you are told that a process must achieve a 2.7 log removal of Giardia cysts. What does that mean in terms of % remaining and % removal?
a driver in a vehicletraveling 40 mph shifts his eyes from right to left and focuses ona child about to dart across the street. estimate the distance infeet the vehicle travels as the driver's eye shift and fixate
a storage tank has a diameter of 80 ft, a height of 25ft and contains oil to a height of 15ft. the suction pumps, which can handle 15000bbl/d, are started, but the safety valves are clogged and a vacuum is drawn in the tank.
Primary treatment removes ~25 percent of the BOD. Calculate the volume (m3) and approximate hydraulic retention time (h) of the aeration basin required to run the plant as a "high rate" facility (F/M = 2 kg BOD/kg MLSS-day).
Heat is now added until the quality is 40 percent. Determine the minimum entropy change of the thermal energy reservoir supplying this heat.
A 100 gram piece of ice cooled at -20 degrees Celsius is placed in the calorimeter. What is the final temperature of the system, and what mass of ice and water remains
Calculate the required pipe size for the rising main DB, assuming that pumping would occur at a uniform rate between 8 am and midnight on the day of maximum demand at the end of the design period.
Determine the maximum pressureallowed in the pipe at a location 10 m above the pipe exit if the flow is to be laminar.
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