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Material science question
1. 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
how kinematic and diffusion wave model been used for rainfall runoff modelling. main computer programme involved.
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A finished 2 x 4 timber (actual size 1 5/8 in. x 3 1/2 in. x 10 ft long) is used as a fixed-end, fixed-end column. If the modulus of elasticity for the timber is 1600 ksi and a factor of safety of 3 with respect to failure by buckling is specified
a 9in radius cylinder of weight 18lb rests on a 6lb carriage. the system is at rest when a force p of magnitude 2.5 lb is applied ( p is coming out of the car the cylinder is sitting on and going to the right) for 1.2s.
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learning objectives-use modern software tools to analyze a structural system of a building.-use the standard asce 7
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