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Consider each of the following intrinsic semiconductors at 300 K: Si, Ge, GaAs, InSb.
(a) From the band gaps of Table 23.1, estimate the density of conduction electrons and valence holes.
(b) Combine these results with the mobilities in Table 23.2 to estimate their electrical conductivities.
Is there a pinch point in this problem, and at what temperature does it occur? Calculate the minimum heat transfers to and from the cold and hot utilities.
a steam power plant operates with a boiler output of 20 kgs steam at 2 mpa 600degc. the condenser operates at 50degc
Using the ACI coefficients, design a continuous reinforced concrete beam that will span four supports. The end spans are 24-ft long; the center span is 28-ft long (spans are measured center to center of supports).
A Boeing 747 is flying at M = 0.7 at an altitude where the temperature is 223.15 K. The density is 0.41268 kg/m3, and the pressure is 26429.7 Pa. The pressure coefficient on a point of the wing is -2. a) Calculate V0. b) Calculate the pressure (in Pa..
consider a steam power plant that operates on the ideal reheat rankine cycle. the plant maintains the boiler at 7000
a closed stationary sytem consists of 2 kg of mass. during a certain process 20 kjkg of work is done on the system and
a fluid has a viscosity of 17 p and a specific gravity of 0.67. find the kinematic viscosity of this fluid in units of
The inclination angle of the regulating wheel = 2.5. Determine the through feed rate of cylindrical work parts that are 25.0 mm in diameter and 175 mm long.
Four kg of water at 100°C fill a closed container having a volume of 1 m3. If the water at this state is a vapor, determine the pressure, in bar. If the water is a two-phase liquid-vapor mixture, determine the quality.
A huge reservoir of air supplies a converging-diverging nozzle with throat and exit areas of 10 cm^2 and 25 cm^2 respectively. The reservoir pressure and temperature are 150 kPa and 20C. Determine the range of back pressure over which
319 grams of r-134a initially fill a weighted piston-cylinder device at 60 kpa and -20 c. the device is then heated
An airplane is flying with 212 KIAS at 10000 feet pressure altitude. The Pitot tube position error for the aircraft is 3 knots. The thermometer reads 0 deg F. Calculate the airplane's KCAS, KEAS, and KTAS.
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