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A sheet of BCC iron 1.7-mm thick was exposed to a carburizing atmosphere on one side and a decarburizing atmosphere on the other side at 725°C. After having reached steady state, the iron was quickly cooled to room temperature. The carbon concentrations at the two surfaces were determined to be 0.014 and 0.0072 wt%. Calculate the diffusion coefficient if the diffusion flux is 3.0 × 10-8 kg/m2-s, given that the densities of carbon and iron are 2.25 and 7.87 g/cm3, respectively.
a uniform chain of total mass m and total length l lies in a heap on a table. one end is pulled upwards at constant
A piston cylinder device contains 8.00 kg of water at an initial pressure of 200 kPa. Initially the piston is at rest on a set of stops and the initial volume is 2.00m3. Heat is transferred to the water until the pressure increases to 1000 kPa when t..
a shaft of radius r and length l is subjected to a uniformly distributed shear. the shaft is fixed at one end and not
a refrigerator is to remove heat from the cooled space at a rate of 2300 kjmin to maintain it temperature
two kilogram of water initially at 200 degc and 0.4 mpa undergoes an isothermal internally reversible compression
For a pump in the basement which must deliver water to a bucket on the floor of the upper mechanical room, what is the minimum pressure in psig you will see at the pump discharge.
estimate the cost an oil change 5 quarts of oil and new oil filter for your automobile at a local service station.it
a 10-ft steel beam is lowered by means of two cables a amp b distant of 9-ft unwinding at the same speed from overhead
A brass rod is stress free at room temperature (20 Deg. C) It is then heated up, but prevented from lengthening at its ends by external forces. At what temperature does the stress in the rod reach -172 MPa? Assume the modulus of elasticity is 100 GPa..
a 3-ft3 rigid tank initially contains r-134a at 120 psia and 100 percent quality. the tank is connected by a valve to a
due to an unequal distribution of fuel in the wing tanks the centers of gravity for the airplane fuselage a and wings b
a storage tank consists of a cylindrical section that has a length and inner diameter of l2 m and di1 m respectively
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