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(a) A galvanized (zinc-coated) steel sheet is found to uniformly corrode with an average current density of 1.4 X 10-7 A/cm2. How many years will it take to uniformly corrode a thickness of 0.030 mm of the zinc coating?
(b) A new Al container develops pits right through its walls with an average current density of 1.25x10-4 A/cm2. If the average pit is 0.50mm in diameter and the aluminum wall is 0.85 mm thick, how many days will it take for a pit to corrode through the wall. Assume the pit has a cylindrical shape and that the corrosion current acts uniformly over the surface area of the pit. For Al corroding: Al? Al3+ + 3e-
The grains of wood in the board make an angle of 20 degrees with the horizontal as shown. Determine the normal and shear stresses that act perpendicular and parallel to the grains if the board is subjected to an axial load of 250 N.(Dimensions l=3..
What would be the resistance on a level road. What horsepower must be delivered to the wheels on the grade? If the efficiency is 80%, what must be the rated horsepower of the motor.
determine critical depth in a circular pipe of 36 inches diameter and roughness coefficient of 0.015 The flow rate is 15 cfs , So = 0.002
The current price of a company stock is $20.The company is a takeover target.If the takeover is successful.the company's stock price will increase to $30.If the takeover is unsuccessful.the stock price will drop to $12.
A piston-cylinder contains 40 kg water of which 20 kg is saturated liquid. The equilibrium pressure of the system is 100 kPa. a) Find the system initial volume b) The water undergoes an isothermal expansion until the pressure reaches 10 kPa.
The phase diagram of a typical simple substance contains three phases , liquid vapor and solid separated by boundaries . The critical point terminates the liquid-vapor transition, in water it is at Pc=220.9 bar and Tc=374 degres celcius
An intake conduit from a well field used to pump ground water is being designed for a town with a population of 23,000 people. Six years ago the population was 21,500 people. a) assuming deometric growth, calculate the population in 50 years
in an air standard otto cycle , the air at the beginning of the compression stroke is at 95 kpa and 22c ,and the cylinder volume is 0.0028 m^3 . the compression ratio is 9 and 4.3 kj are added during the heat addition process
An observer has determined that the time headways between successive vehicles on a section of highway are exponentially distributed and that 60% of the headways between vehicles are 15 seconds or greater.
Describe a soil classified as SW and a soil classified as CH in the Unified Soil Classification System as you would to a person having no knowledge of soil classification procedures or equipment.
The cables A and B exert forces FA and FB on the hook. The magnitude of FA is 100 lb. The tension in cable B has been adjusted so that the resultant of the two forces is oriented perpendicular to the wall to which the hook is attached.
A 1.0 × 106 gallon reactor is used in a sewage-treatment plant. The influent biochemical oxygen demand (BOD) concentration is 100 mg/L, the effluent BOD concentration is 25 mg/L, and the flow rate through the reactor is 500 gal/min.
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