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A mild steel component in a form of a finite slab with a thickness of 2L=2.5 mm is to be hardened by packing it in a carbonaceous material in a furnace for a predetermined time. the uniform initial carbon concentration of the slab is 0.15 percent by mass. the component is now packed in carbonaceous material on both sides and is placed in a high temperature furnace. the diffusion coefficient of carbon in steel at the furnace temperature is given to be constant at 4.8x10^-10 m^2/s, and the equilibrium concentration of carbon in the iron at the interface is determined from the equilibrium data to be 1.2 percent by mass.
If the component is kept in the furnace for 30 minutes, determine the mass concentration of carbon 0.5 mm below the surface.
Water is pumped 9 mi from a reservoir at elevation 100 ft to a second reservoir at elevation 210 ft. The pipeline connecting the reservoirs has a 54-in diameter. It is concrete and has an absolute roughness of 0.003.
Water flows steadly in an open topped channel of rectangular cross section. The channel width is B and the depth of the water is D. The flow is designed using a rectangular coordinate system whose orgin is at the free surface midway
determine the planer density and packing faction for FCC nickel in (100), (110), and (111 planes. which, if any, of these planes is close-packed
Three loads are applied to a beam. the beam is supported by a roller at A and by a pin at B. neglecting the weight of the beam, determine the reaction at A and B when P=15kips.
Granny viola has been saving money in the Bread and Butter mutual fund for 15 years . She has been a steady depositor over those years and has a pattern of putting $100 into the account every 3 months.
What is the final equilibrium temperature of the two bodies?
A 100-ton train traveling on a horizontal track requires 400 hp to maintain a constant speed of 50 mi/h. Determine (a) the total force needed to overcome axle friction, rolling resistance, and air resistance
An engineer is to design a channel lined with planed wood to carry 2 m3/s of water on a given slope. The channel cross section can be either a 90 degree triangle or a square. Which would require less wood and by what percentage
A wheel tractor-scraper is operating on a level grade, assuming no power derating is required for equipment conditions, altitude, and temperature.
The distance from the point of intersection of the tangents to the PI of the second curve is 100m while the stationing of the PI of the first curve is 10+432.24.If the radius of the curveis 285.40 m,
The longitude of Albany, New York, is +73 degrees 44' 49" and the longitude of Los Angeles, California, is +118 degrees 10' 44". When the local mean time at Los Angeles is 10h 41m 00s a.m., the local mean time at Albany is
Suppose a sample of the 90 °C air is put in a closed variable-volume chamber containing a mirror, and the pressure is raised at constant temperature until a mist forms on the mirror. At what pressure would the mist form
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