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It has been determined that the steady-state diffusion flux of a gas molecule through a solid metal plate is 5*10^-8 kg/m^2*s at a temperature of 1000K, and a concentration gradient of -300 kg/m^4. What concentration gradient is necessary to give a diffusion flux of 6*10^-8 at a temperature of 1300K if the activation energy for diffusion is 120,000 J/mol?
A 3000 lb vehicle has a drag coefficient of 0.32 and a frontal area of 30 ft2. What is the minimum tractive effort required for this vehicle to maintain a 65 mph speed on a 2% upgrade through an air density of 0.002045 slugs/ft3
A simple horizontal curve of radius 750 ft connects two tangents that intersect at an angle of 66º30'. Compute the parts of the curve, including T, L, LC, E, M, and D.
Given for a simple curve: R = 500 ft, I = 58º08'40" and the station of the PI is 38+17.25. Set up the field notes for staking out the curve with deflection angles and incremental chords.
design a horizontal curve for a two-lane road. The road has 12-ft. lanes. Due to expansive excavation, it is determined that a maximum of 34 ft. can be cleared from the road's centerline toward the inside lane to provide for stopping sight distanc..
A train which is traveling at 80 mph applies its brakes as it reaches point A and slows down with a constant deceleration. Its decreased velocity is observed to be 60 mph as it passes a point 1/2 miles beyonds A.
Deflection of a Beam, If a beam of lenght L is fixed at the ends and loaded in the centre of the beam by a point load of F newtons the deflection
Compute the motor size required to pump 28.3 cms through a 3,050 m long, 3.66 m diameter pipeline to an upper reservoir 610 m above the lower reservoir. Use a friction facter of 0.02 and a pump efficiency of 80 percent.
A concrete dam retaining water has a specific weight of concrete of 23.5kn/m3, what is the factor of safety against sliding & overturning and pressure intensity on the base if coefficient of friction is 0.45
Two 9-in.-diameter pipes (pipe 1 and pipe 2) are supported every 7.5 ft by a small frame like that shown. Knowing that the combined weight of each pipe and its content is 30 lb/ft and assuming frictionless surfaces
Stripping overburden in the Illinois coal belt, the Dusty Coal Company uses 270-horsepower, track-type tractors (with direct-drive transmissions) and drawn scrapers.
Ends A and D of the two solid steel shafts AB and CD are fixed, while ends B and C are connected to gears. Knowing that a 4-kN(m) torque T is applied to gear B, determine the maximum shearing stress (a) in shaft AB, (b) in shaft CD.
Additional cost at the end of year 1 = $50,000. Benefit at the end of year 1 = $0. Annual benefits at the end of Years 2-10 = $20,000. Interest Rate = 7%. Conventionally B/C ratio and wheter the project is economically stable.
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