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Colette Lake has a surface area of 103 ha and a mean depth of 8 m. The pH of the water is 7.6. The lake receives surface water from a lake upstream, rainfall, and diffuse groundwater input. Atmospheric inorganic N deposition is insignificant. Contaminated groundwater is the major source of inorganic N in the lake. During April, 62 mm of rainfall fell on Colette Lake. During the same month, 4.2 x 10^6 m^3 of groundwater having an inorganic N concentration of 8.4 mg/L flows into the lake at a rate of 21.00 m^3/s. The sedimentation rate for inorganic N was measured as 49 mg N/m^2*days. A river drains into the lake at a rate of 22.64 m^3/s. there are no other sources of water into or out of the lake. Calculate the steady state concentration of inorganic N into the lake.
Fluid mechanics ch.9: A supertanker has length, breath, and draught (fully loaded) dimensions of 325m, 48m, and19m, respectively. In open seas the tanker normally operates at a speed of 115 kt (1 kt=0.515m/s).
Three point loads 10,000, 7500 and 9000 kN act in line 5m apart near the surface of a soil mass. Calculate the vertical stress at a depth of 4m vertically below the centre (7500kN) load.
Helium (Hrom an intie) at a rate of 1.5 lbm/s is compressed inan adibatic compressor from an intial condition of 70 F, 14.7 Psiato final condtion of 1070 F, 147 Psia. Determine The power required to run his compressor
By integration, determine the moment ofinertia about a horizontal axis at the channel bottom. Using the parallel axis theorem, determine the moment of inertia about ahorizontal axis through the centroid.
Three loads are applied to a beam. the beam is supported by a roller at A and by a pin at B. neglecting the weight of the beam, determine the reaction at A and B when P=15kips.
Estimate the weight of concrete in a four-lane highway segment that begins as a 3% grade climb from 1000 feet altitude to 4000 feet and then a 6% downgrade to 2500 feet
If the elastic limit of steel is 5.0 10^8 Pa, determine the minimum diameter a steel wire can have if it is to support a 69-kg circus performer without its elastic limit being exceeded.
When the air temperature is 25°C, the pressure gage reads 210 kPa. If the volume of the tire is 0.025 m3, determine the pressure rise in the tire when the air temperature in the tire rises to 50°C.
Determine the maximum allowable temperature rise if the allowablecompressive stress in the copper is σ(allowable) = 19,500 psi.
A subway train is traveling at a speed of 45 miles/hour whenthe brakes are fully applied on the wheels of cars A and B, causing them to slide on the track
The bar is confined to move along the vertical and inclined planes. The velocity of the roller at A is Va=5.2 ft/s when theta=40 . a)Determine the bar's angular velocity when theta=40. b)Determine the velocity of roller when theta=40.
two strips of a plastics material are bonded together as shown. The average shearing stress in the glue must be limited to 1000 kpa. what length L of splice plate is needed if the axial load carried by the joint is 55 kN and the width (W) is 315 m..
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