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Consider the gas carburizing of a gear of 1020 steel at 927oC. Calculate the carbon content at 0.5mm beneath the surface of the gear at 5hr carburizing time. Assume the carbon content at the surface is 0.90% and that the steel has a nominal carbon content of 0.20%. The diffusion coefficient of C in 1020 steel at 927oC is 1.28 x 10-11m2/s.
if the incoming nitrogen is at a pressure of 25 psi and temperature of 20oc and to flow 1200ft3hr. of nitrogen through
consider a large classroom on a hot summer day with 150 students each dissapating 60w of sensible heat. all the lights
Calculate the Gibbs free energy change of a rubber band stretched to 5 times its original length with concurrent contractions in its other two dimensions of 2.24 times at 25 C. The number of rubber molecules per unit volume, N, for a typical rubber i..
evaluate and compare the lower heating values per unit mass of stoichiometric mixture and per unit volume of
Niobium forms a substitutional solid solution with vanadium. Compute the weight percent of niobium that must be added to vanadium to yield an alloy that contains 1.55 x 1022 Nb atoms per cubic centimeter. The densities of pure Nb and V are 8.57 an..
Consider three spherical rocks having diameter of 10 cm (A), 20 cm (B), and 40 cm (C). The densities of these rocks are given to be 2,500 kg/m3. They were left to free-fall above a water stream having a uniform velocity profile (um=0.1 m/s). The stre..
A “Pumpkin Chucker” design for the annual Punpkin Chunkin competition held near Millsboro, Delaware every fall (first week of November) uses a pneumatic launcher (air cannon) to throw its pumpkin. It is important to know if your “ammunition”, the pum..
the compressor turbine of a simple gas turbine each have isentopic efficiencies of 90. the compressor pressure ratio is
Twenty pounds of a gas mixture is contained in a tank with volume 30 cubic feet at 30 psia and 70 F. The gas mixture has volumetric analysis of twenty percent carbon dioxide, thirty percent oxygen, and fifty percent nitrogen.
1. Steady-state conditions exist in the circuit shown in Figure P5.27 for t 0. The switch is closed at t = 0. V1 = 12 V C = 0.47 μF R1 = 680 Q R2 = 2.2 kQ R3 = 1.8 kQ Determine the time constant of the circuit for t > 0.
a high strength steel has a yield strength of 1460 mpa and a kic 98 mpa m12. calculate the size of a surface crack that
a steel wide flange beam w14 x 26 carries the load. compute the maximum deflection between the supports and at each
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