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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.
consider the steady operation of a refrigeration package for a shipping container on a train truck or ship. the package
a current of 0.25 amps is flowing trough a single resistor connected to a 12.00 volt battery. determine the value of
A 30-cm-long, 1-cm-diameter aluminium fin (k=237 W/m·K) is exposed to an environment at 22oC. The base temperature of the fin is maintained at 80 oC. The heat transfer coefficient between the rod and the surrounding air is 11 W/m2·K.
consider a one-dimensional plane wall with constant properties and uniform internal generation qdot. the left face is
a fruit juice containing 30 solids of molecular weight 100 g was placed in a tray length 100 cm height 90 cm width 8
a medical technician uses a pair of four inch long tweezers to remove a wood sliver from a patient. the technician is
0.1kg of water is contained within a piston-cylinder assembly at 100 degree c. the piston is free to move smoothly in
A gas expands in a piston-cylinder device from 0.01m^3 to 0.03m^3. The pressure and volume during the process are described by the relationship P=aV^-1+b, where P is in bar and V is in m^3, a and b are constants
consider a sample of pure nickel in the shape of a coin. the area of the flat face is 1 cm2 and the initial thickness
a boy with a weight of 150 lbs is at rest when the swing makes an angle of 30o with the vertical. his center of gravity
before installing the water pipes in a new house an engineer measured the pressure in main water line near the house to
A new, simple, lightweight drone quadcopter needs to be designed with a total minimal weight and a maximum payload and as many standard parts as possible, including fasteners.
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