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An iron-carbon alloy initially containing 0.55 wt% C is exposed to an oxygen-rich and virtually carbon-free environment at 1325 K. Under these conditions, the carbon diffuses from the alloy and reacts with oxygen at the surface. Therefore, the surface concentration of carbon is effectively 0 wt% C. The diffusion coefficient for carbon in iron at 1325 K is 4.3 x 10-11 m2/s. At what depth below the surface will the carbon concentration be 0.25 wt% after a 10 hour treatment?
explain the factor, which inhibit the use of a very high resolution and a large number of colors for display in the case of raster scanning display devices.
during the packaging process a can of soda of mass 0.4 kg moves down a surface inclined 20 degrees relative to the
what is the rotation matrix for an object rotation of 30o around the z axis followed by 60o around the x axis and followed by a rotation of the y axis. all rotations are counter clockwise.
explain the following terms with respect to 4-storke cycle internal combustion engines strokebore ratio piston
A 25-g bullet is traveling with a velocity of 425 m/s when it impacts and becomes embedded in 2.5 kg wooden block. The block can move vertically without friction. Determine a) the velocity of the bullet and block immediately after impact,
steam enters the nozzle of a turbine with a low velocity at 3 mpa 350degc and leaves the nozzle at 1.6 mpa at a
An air heater may be fabricated by coiling Nichrome wire and passing air in cross flow over the wire. Consider a heater fabricated from wire of diameter D=1 mm, L= 2m, electrical resistivity rho=10^-6 ohms, thermal conductivity k=25W/mK, and emiss..
a high pressure axial compressor for a jet engine rotates at 15000 rpm with an overall stagnation pressure ratio of
consider a large plane wall of thickness l 0. 5 m. the wall surface at x 0 is insulated while the surface at x l is
a certain material 2.5 cm thick with a cross-sectional area of 0.1 m2 has one side maintained at 35oc and the other at
a system of 1 lb of r22 contained in a piston cylinder undergoes the following process in seriesprocess a constant
an ideal diesel cycle has a maximum cycle temperature of 2300degf and a cutoff ratio of 1.4. the slate of the air at
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