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Write the small-displacement equations for an induction machine with currents as state variables and with a small displacement in ωe where Δωe is an input variable. It is clear that the resulting equations are valid for small changes in the frequency of the applied stator voltages.
A rectangular channel with a width of 6.0 feet conveys a discharge of 115 cfs. If the depth of flow is 3.0 feet, what is the velocity? What is the Froude num- ber? Is the flow subcritical or supercritical?
carbon monoxide and water vapor react to form carbon dioxide and hydrogen. water at 25c is fed to the reactor 50 in
As fresh poured concrete hardens, the chemical transformation releases energy at a rate of 2 W/kg. Assume the center of a poured layer does not have any heat loss and that it has an average heat capacity of 0.9 kJ/kg K. Find the temperature rise d..
Silicon rubber has a Poisson's ratio of 0.4. Consider a silicon rubber drain hose for a surgical procedure; the hose has an outer diameter of 4 mm and a wall thickness of 0.5 mm. How much does the lumen (interior space) of the catheter constrict if t..
a heat pump keeps the air temperature in a house at a temperature of 22.5 oc. the house is losing heat to the outside
Why is the low-temperature endotherm for ambient pressure in Figure 31-10 found at the same temperature as that at 13.79 bar, whereas the high-temperature peaks for the two pressures are found at different temperatures?
The principal strains in a circular bulge test are the thickness strain, εt, the cir- cumferential (hoop) strain,εc, and the radial strain, εr. Describe how the ratio εc/εr varies over the surface of the bulge. Assume that the sheet is locked at the ..
according to archimedes principle the mass of a floating object equals the mass of the fluid displaced by the object. a
Prove that the ratio of depth to width of the strongest beam
a 12 cantilever beam has a 4000 lb load at the end of the beam. draw the shear force and bending moment diagrams and
The support of a spring-mass system is vibrating with an amplitude of 6 mm and a frequency of 1200 cycles per minute. If the mass is 0.95 kg and the spring has a stiffness of 1950 N/m, determine the amplitude of vibration of the mass. If a damping..
a .5 m3 tank contains ammonia initially at 40 c and 8 bar. a leak develops and refrigerant flows out of the tank at a
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