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Dust is removed from the airstream of a municipal incinerator by four dust collectors operating in parallel, each handling 1/4 of the total airflow of 200 m3/min. The airstream contains 10 g/m3 of suspended solids. The collector efficiency is 98%, decreasing linearly to 74% as air flow is doubled. If the maximum permissible solids concentration from the combined stack discharge [all 200 m3/min] is 1.0 g/m3, can one collector be temporarily taken out of service by: (a) overloading the other 3 units [i.e., each of the three handling 1/3 of the total flow], or (b) by not treating 1/4 of the airflow [i.e., mixing 150 m3/min of treated air with 50 m3/min of untreated air]?
a saturated 100 cm^3 clay sample has a natural water content of 30 percent. it is found that the shrinkage limit occurs when the water content is 19 percent. if the specific gravity of soil solids is 2.70
The pipe is connected to a 400mm diameter pipe by a concentric reducer, the gauge pressure at the entrance of the reducer is 3.00 bar and the the energy losses are neglected . Determine the restraining force.
A car is traveling toward a 20 degree slope at 60 mph. The wheels have a radius of 12 in, and the car's wheelbase is 100 in. What is the angular rotation rate of the car immediately after the front wheel contacts the slope
Because of the insulation between them, the sun heats up the wall panel 120 degrees F but the column to 80 degrees F. Determine the consequent compressive stress in the curtain wall.
What is the resultant force on one side of a 25cm diameter circular plate standing at the bottom of 3m of pool water
A wheeled tractor with high-pressure tires and weighing 74,946 lb is pulled up a 5% slope at uniform speed. If the tension in the tow cable is 13,000 lb, what is the rolling resistance of the road
A chair weighing 150 rests on a level floor that is not frictionless. A man pushes on the chair with a force = 43.0 that is directed at an angle of 34.0 with the horizontal. Assume that the chair is stationary but is on the verge of sliding.
Consider the same plate under the action of cyclic tensile/compressive stresses of 120MPa and -30 MPa, respectively. If the component is to remain safe for 10 million cycles, what is the largest allowable crack length?
An engineer would like to make a physical model of the molasses flow but use water instead of molasses. How much would the velocity and the radius of the pipe have to change to keep the flow dynamically similar
A water storage tank located on a larege dairy farm has a storage capacity of 0.1 ML. The average rate of water consumption from this tank is 6.25 kL per day, every day.
A 5-m wide rectangular channel is carrying a flow of 5 cubic meter per second. If the Manning n=0.013 and the bottom slope, So=0.0001, determine the normal depth using a converging iteration.
A circular PVC plastic (smooth) storm sewer has a diameter of 18 in. At the design flow, it is intended to have a relative depth of 0.8. At what minimum slope can it be laid such that the velocity is at least 2 ft/s at design flow and depositied soli..
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