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A Ni-based superalloy has 0.2 μm thick oxide layer. When placed in a burner rig to test for oxidation, it was observed to grow to 0.3 μm in 1 h. If the superalloy follows a parabolic oxidation law (x2 = a + bt, where x is the thickness, t is the time, and a and b are constants) what is the thickness after one week?
Find the tension in the string. Suggestion: Draw a force diagram for a small piece of the loop subtending a small angle, Δθ.
a machine of mass 10 kg is subjected to a vertical sinusoidal force. the amplitude of the force transmitted to the
the 4 in diameter brass shaft shown is fixed at end a and fastened securely to a rigid horizontal member at end b.
A hypothetical metal has an HCP crystal structure with the ideal c/a ratio (1.633). What is the volume of its unit cell, if the atomic radius is 1.3A?
An aircraft is propelled by a reversible gas turbine engine, or turbojet. It is flying at an altitude of 30,000 ft where temperature is -20oF and pressure is 2000 psfa. The compressor has a pressurization ratio p2/p1 of 16 and the kerosene fuel in th..
a deep freezer for hazardous chemicals is to be maintained at -20of to insure a safe environment for the chemicals. the
Determine the critical load Pcr for the structure from figure part (a).
a liquid-vapor mixture of h2o at 2 mpa is heated in a constant volume process. the final state is the critical point. a
determine the horsepower input for a motor necessary to lift a 200 kg box at a constant rate of 2 ms. the overall
a system executes a power cycle while receiving 800 kj by heat transfer at a tem-perature of 1600 k and discharging 120
Determine the shear stress, acting on plane AB and the principal stresses at the point and find the friction coefficient.
A cyclist is able to obtain a maximum speed of 20 mph on a calm day. The total mass of the rider and bike is 90 kg. The rollingresistance for the tires (a constant force) is FR = 7.5N and the drag coefficient and frontal area are CD = 1.2 and A = 0.2..
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