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A 4 X 8-ft solar collector has water circulating through it at the rate of 1.0 gallon per minute while exposed to sunlight with intensity 300 Btu/ft^2-hr. Fifty percent of that sunlight is captured by the collector and heats the water flowing through it. What would be the temperature rise of the water as it leaves the collector? where T_0= T_i + delta T and T_i is the rate of gallon per minute.
At a specified point on a highway, vehicles are known to arrive according to a Poisson process. Vehicles are counted in 20-second intervals, and vehicle counts are taken in 120 of these time intervals.
The casting has a mass of 3 Mg. Suspended in a vertical position and initially at rest, it is given an upward speed of V mm/s in 0.3s using a crane hook H. Determine the tension in cables AC and AB during this time interval if the acceleration is ..
A soil sample with a water content of 14.5% and unit weight of 128.2 lb/cu. ft. was dried to a unit weight of 118.8 lb/cu. ft. without changing its void ratio. What is its new water content (in %)?
Jack Flubber, who owns sons of Flubber Construction Co. and runs it as a proprietorships had gross profit last year of $ 80000. His personal and family expenses are $ 52000 and he has $ 7000 in exemptions and deductions.
At the end of 15 years, the first motor will have a salvage value of $50 and the second motor will have a salvage value of $100. consider the MARR to be 8%. (note : 1HP=0.7457 kw). Determine which motor should be installed based on the PW criterio..
The distance covered by an aerial photograph is determined by both the focal length of the camera and the tilt of the camera. Although the tilt is usually small, both archaeological and Canadian photographs often use larger tilts.
The herbicide 2,4,D, is applied to a golf course at a rate of 1.2 kg/ha. The organic matter content of the soil is 1%, bulk density is 1.3 g/cm3, and water content is 0.3. a) What fraction of the herbicide is adsorbed, and what fraction is dissolve..
A drinking water treatment plant will be designed to process a flow of 15,000 m3/d. The sedimentation tank will have a residence (detention) time of 4 hours and the overflow rate (Q/A) of 16 m 3 /m 2 -day. Estimate the required surface area (A), an..
The number of vacancies in some hypothetical metal increases by a factor of 4 when the temperature is increased from 1090 K to 1140 K. Calculate the energy (in J/mol) for vacancy formation assuming that the density of the metal remains the same ov..
Presedimentation can reduce the suspended solids concentration of raw river water from 500 mg/L to 200 mg/L. How many pounds of dry solids does this represent per million gallons?
In using the Darcy-Weisbach equation for flow in a pressure conduit, what percentage error is introduced in Q when f is misjudged by 20 percent?
The viscosity of the film of oil separating the piston from the cylinder is 0.020 lb.s/ft. Calculate the force required to maintain this motion.
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