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The decarburization of carbon from a steel with an overall composition Co = 0.3wt% carbon can be expressed by the equation: Cx= Co.erf(z). If the steel is decarburized in vacuum at 1000 C for one hour, calculate the carbon concentration in steps of 0.2 mm as you go into the depth of the steel (starting with x=0 at the surface) until you reach the overall concentration of 0.3 wt % carbon. Given the diffusivity of carbon in Fe = 3 x 10-11m2 per second.
a soil sample is obtained by pushing a 16 in long tube into the side of a pit. the tube has an inside diameter of 3 in. and weighs 1.8 lb. The soil in the tube is trimmed so that its ends are flush with the ends of the tube.
an air space above a long tube is pressurized to 50 kPa vacuum. water (20 degrees C) from a reservoir fills the tube to a height h. If the pressure in the air space is changed to 25kPa vacuum, will h increase or decrease and by how much
A ten-foot high wall will retain a medium dense sand backfill. Determine the Rankine earth pressure diagram and the total active force on the wall.
a vertical curve with grade1= 3.6% meets the exit grade of -4.7% at PVI located at station 26.50. A vertical curve of 700 feet is propsed to provide the transition between the two grades.
What is the pH of the solution created by combining 0.90 mL of the 0.10 M NaOH(aq) with 8.00 mL of the 0.10 M HCl(aq)? with 8.00 mL of the 0.10 M HC2H3O2(aq)?
Model tests are to be performed to study the flow through a large check valve having an inlet diameter of 2 feet and a volume flowrate Qp of 30 cfs. The working fluid in the model is water at the same temperature as that in the prototype.
A cylinder fitted with a frictionless piston contains 2 kg of superheated refrigerant R-134a vapor at 350 kPa, 100oC. The cylinder is now cooled so that the R-134a remains at constant pressure un- til it reaches a quality of 75%.
Plot the variation with depth (z) of the at-rest lateral earth pressure behind the wall, and determine the magnitude and location of the at-rest lateral earth force per unit length of wall.
The vehicle has a frontal cross -sectional area of 1.9 m^2. The roadway has a straight alignment and a badly patched and broken asphalt surface. assume a drag coefficient of 0.3 and p of air of 1.29 kg/m^3
A gas bubble is formed at the tip of a small tube which is completely immersed in a large body of liquid. The bubble remains in contact with the open end of the tube in a way that allows us to control the pressure P inside the bubble.
a dry cleaning establishment buys 500 gal of carbon tetrachloride every month. as a result of the dry cleaning operation, most of this is lost to the atmosphere and only 50 gal remain to be disposed of.
Two activated sludge aeration tanks in Podunk, MO are operated in series. Each tank has the follwing dimensions: 7.0 m wide x 28.0 m long x 3.5 m effective liquid depth.
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