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A metal A Is diffusing into another pure metal B to form an alloy. After 30 hours, the concentration of A is 3.2wt% at a distance of 1.5mm from the interface between metals A and B. The diffusion coefficient of A in B corresponding to the reaction conditions is 3.84 x 10-11m2/s. Determine the surface concentration Cs.
The error function table is given here
Z
Erf(z)
0.30
0.3286
0.35
0.3794
0.40
0.4284
0.45
0.4755
0.50
0.5205
0.55
0.5633
A steel scuba tank is 24 in. long and has an external diameter of 7.25 in. and an internal diameter of 6.7 5in. Say the tank is to carry a pressure of 3000psi . Determine the hoop stress in the tank wall. Determine the axial stress in the tank wal..
he tapered member is fixed connected at its ends A and B and is subjected to a load P = 7 kip at x =30in. Determine the reactions at the supports. The material is 2in. thick and is made from 2014-T6 aluminum (Eal = 10,600ksi).
A) Estimate the aquifer porosity and hydraulic conductivity, B) determine the flow rate per unit width of the aquifer, C) determine the specific discharge, D) determine average linear velocity of the flow assuming steady unidirectional flow
What is the design storage and water surface elevation at the peak outflow rate and estimate the long-term average reduction (EPA, 1986) in particulates under dynamic conditions.
Compute the motor size required to pump 28.3 cms through a 3,050 m long, 3.66 m diameter pipeline to an upper reservoir 610 m above the lower reservoir. Use a friction facter of 0.02 and a pump efficiency of 80 percent.
A tape is calibrated and found to measure 100.04ft between the 0- and 100-ft marks. What measurements should be laid out to establish a horizontal distance of 682.25ft?
Determine the minimum necessary clearance height of the overpass and the resultant elevation of the bottom of the overpass over the PVI. (ignore the cross-sectional width of the overpass)
given f(x) = -2x^6 - 1.5x^4 + 10x +2. use a root location technique to determine the maximum of this function. perform iterations until the approximate relative error falls below 5%.
A sag vertical curve connects a -1.5%grade and a +1.5% grade on a freight and intercity main linerailway track. If the grades intersect at station (300+25.35)and an elevation of 350.50ft,
A trapezoidal river channel section has a base dimension of 30 feet, a liquid depth of 4 feet, and side slopes of 4 to 1 (horizontal to vertical).
With all the developments and improvements to the GNSS system over the years, what is one important facet of the system that has not improved
The risk-free rate of interest is 7/8 per annum with continuous compounding, and the dividend yield on a stock index is 3.2% per annum. The current value of the index is 150. What is the six-month futures price?
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