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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.
calculate the force necessary to accelerate a 20 kg 400mm diameter sphere which is at rest under water at the rate of 5
A converging nozzle with an exit diameter of 6 cm is attached to a reservoir maintained at 30-C and 150 kPa absolute. Determine the mass ?ux of air ?owing through the nozzle if the receiver exits to the atmosphere.
A piston-cylinder assembly with an initial volume of 0.01m^3 is filled with saturated refrigerant 134a vapor at 16 degrees Celsius. The substance is compressed until a state of 9 bars and 60 degrees Celsius is reached. During the compression process,..
air at a velocity of 35. 2 ft sec and a pressure of 793. 1 nun hg flows in a long circular pipe whose inside diameter
a system executes a power cycle while receiving 1000 kj by heat transfer at a temperature of 500 k ad discharging
How should the shield be oriented to provide the larger reduction in heat transfer between the plates? That is, should the surface of emissivity ss or that of emissivity 2ss be oriented toward the plate at T1?
in state and national forests it is common to store water in large water towers for reserve in the case of forest
the power output of an adiabatic steam turbine is 5.5 mw. at the inlet p 2.0 mpa and t 435 degc. the steam enters the
Calculate the Grash of number, the Nusselt number, the convective heat transfer coefficient (h), and the total heat transfer (Q_dot) in ambient air at Tinf = 30C for the following conjurations:
A power cycle operates between two reservoirs having temperature 700 K and 300K, respectively. QH is the heat (thermal energy) received from the hot reservoir. QL is the heat rejected to the cool reservoir. Wmech represents the mechanical work produc..
a 20-m3 tank contains nitrogen at 23degc and 600 kpa. some nitrogen is allowed to escape until the pressure in the tank
What amount should it report as the cumulative effect of changing the estimated bad debt rate?
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