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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.
A vertical pipe of 4ft diameter and 60 ft long has a pressure head of 22.7 ft of water at its upper end. when the flow of water through it is such that the mean velocity is 16 fps, the pipe friction head loss is hf = 2.8 ft.
Determine the tension in the cable as the box moves between A and C and determine normal and tangential force components the road exerts on the car at this instant.
Weather records for a certain region indicate that there is a tendency for two hot summers to occur in a row. From the statistics for the region, the following information has been es tahlished
Determine the uniform flow depth in a trapezoidal channel with a bottom width of 8 ft and side slopes of 1 vertical to 2 horizontal. The discharge is 100 ft3/s. Manning roughness factor is 0.015 and the channel bottom slope is 0.004.
A container of petrol on a set of scales is used to measure the rate at which fuel is used by an engine under test. In one test the weight measured by the scales decreases by 25.0 N in 1 hour. (Assume the specific gravity of petrol is 0.720 and g is ..
For n alloy with composition of 25 wt% Ag-75 wt% Cu and at 775?C do the following (a) Determine the mass fractions of ? and ? phases. (b) Determine the mass fractions of primary ? and eutectic microconstituents. (c) Determine the mass fraction of eut..
design a concrete (n = 0.013) channel that will convey 50,000 GPM. It is to be a trapezoidal in cross section with a bottom width of 7.5 feet. The side slopes are to be 1.33:1 (H:V) and it is desired to have the depth of flow constant at 2.0 feet.
A specimen of saturated soil has a water content of 145 percent and a total unit weight of 84 pcf. Find the void ratio and specific gravity of solids.
Find the area of the parallelogram with vertices: P(0,0,0), Q(-2,4,0), R(-2,2,-2), S(-4,6,-2).
A light rail transit agency operates trains over a 25-km long single-track line. During the peak period, it operates five trains at 15-min headway. Train travels at an average speed of 50 km/hr.
A large parabolic antenna is designed against wind load. During a wind storm, the maximum wind-induced pressure on the antenna, P, is computed as P= 1/2CRV^2 Where C = drag coefficient, R = air mass density in slugs/ft3, V = maximum wind speed in ft/..
The city has a stable population of 235,000 residents and the design criteria for the new landfill are as follows: MSW generation rate = 4.0 lb/(person-day); density of the compacted MSW in the landfill is 775 lb/yd3
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