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A first order reaction takes place in a batch reactor to remove an undesired contaminant (compound A) from a drinking water. The rate constant = 2.0 per day. The initial concentration = 75mg/L. What is the concentration of compound A that remains after 16 hours? Include integration of the rate expression to develop and equation that defines the concentration as a function of time.
A before-and after speed study was conducted to determine the effectiveness of a series of rumble strips installed approaching a toll plaza to reduce approach speeds to 40 mi/h.
Determine a composite SCS runoff curve number for a 600-acre basin that is totally within soil group C. The land use is 40 percent contoured row crops in poor hydrologic condition and 60 percent native parture in fair hydrologic condition.
The salt water mixes thoroughly with the fresh water and the mixture overflows out of the tank. If the flow rate out of the tank is 60 liters/minute. Assume freshwater is 1000 kg/m^3, and the salty water is 1020 kg/m^3.
At a point in a material, a resultant stress of 151 MN/m^2 acts in a direction making angles of 52 deg, 79 deg, and 40.13 deg with the coordinate axes, x,y and z respectively.
Consider some hypothetical X+ - Y - ion pair for which the equilibrium interionic spacing and bonding energy values are 0.38 nm and - 6.38 eV respectively. If it is known that n in the equation has a value of 10
Soil is excavated from a borrow to construct an embankment with a net volume of 50,000 cy with 95% of Modified Proctor maximum dry density of 110 pcf with a Modified Proctor optimum water content of 8%.
The diffrence b/n the sum of angles of a plane triangle and the sum of angles of sph triangle is one second. when the triangle on the earth surface has an area of about
The structure consists of two uniform members AB and BC, each weight 2kN. The member are pinned to each other at B, and the structure is supported by a pin at C and a surface at A having coefficient of static friction 1.2.
what are the isrm standard for uniaxial tensile stress , ucs ,punch shear test and point load test for testing a rock sample
What is the solution if foundation bolt cut by some way from their bottom of skid, i mean skid base than how to keep another bolt etc for tightness of skid along with pump-motor already fittied with pipe and other fitting's too..
A car is traveling up a 3% grade on a road that has good, wet pavement. The engine is running at 2500 rpm. The radius of the wheels is 15 inches, the driveline slipage is 3% and the overall gear reduction ratio is 2.5 to 1
The two cylinder containers are joined by bolting their flanges together. How many 1-inch diameter steel bolts are required to hold the cylinders together when the assembly is subjected to an internal pressure of 200 psi
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