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We want to achieve a concentration of 0.5%wt of carbon at a depth of 0.2 mm below the surface of the slab of a metal. The initial concentration of carbon in the metal is 0.1wt%. We first do an experiment by applying a concentration of 5%wt of carbon at the surface of a similar slab and maintaining the system at 900 K for an hour. We find that this is just adequate to produce the required concentration at a depth of 0.1 mm. We now take the original slab and apply a concentration of 5wt% of carbon at the surface, at a temperature of 1200 K. The diffusion coefficient of this metal increases by a factor of 2 when the temperature is raised to 1200 K from 900 K. How long must it be maintained at this temperature to achieve the required concentration?
A 30 feet column is braced at the mid-section to prevent premature failure. If the maximum load is 380 kips, select an appropriate W14 section, if any, to support the loading conditions.
A rig accelerates a load of 200000 lbf from zero to 60 ft/min in 5 seconds. compute the load shown on the hook load indicator.
Determine the arrival rate assuming that it is unchanged over the duration of the observation period. An approach to a pretimed signal with a 60second cycle has nine vehicles in the queue at the beginning of the effective green.
A six bladed rushton turbine 2.0m in diameter rotating at 25 rev/min in a tank 4m deep, water temperature= 10 degree celcius. For this flocculation system calculate the following: a) Reynolds number
A rod is subjected to a tensile load of 25k and has a diameter or 2in, determine the principle strains at a point on the surface of the rod
A cantilever beam of length 50 ft is embedded in a wall at A and has a free end B. A concentrated load of 100 kips upward is located at x = 25 ft from A. A uniformly distributed load of 20 kips/ft downward extends from 25 to 50 ft.
A fireboat pump draws seawater (density=1.95 slugs/ft^3) from a 6 inch diamter submergred pipe that reaches 6 feet under the free surface and discharges 120 ft/s through a 2 inch diamter nozzle 10 feet above the free surface.
Determine the ASD reference and adjusted design values for the following members and loading conditions. All members are Select Structural Southern Pine and are fully braced to prevent lateral torsional buckling. Bending Occurs about the strong ax..
street nam sizes on the signs at a certain location can be discerned by a person with 20/40 vision from a distance of 300 ft. how much larger should the street names be in order to be legible to a person with 20/50 vision from a distnace of 450 ..
A -2.8% grade line meets a +3.6% grade line at station 125+00 at elevation of 1631.04. Assuming a length of curve is 650feet, compute the elevation and station of the BVC (PVC) and the EVC (PVT).
The arrival rate at a parking lot is 6 veh/ min. Vehicles start arriving at 6: 00 P. M., and when the queue reaches 36 vehicles, service begins. If company policy is that total vehicle delay should be equal to 500 veh-min
Draw the shearing force diagram and the moment diagram of the following problem. The beam is indeterminate. You need to integrate the moment twice to get a formula for the deflection v(x).
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