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Boron is diffused into highly pure germanium at 1000oC (Q = 105 kcal/mol; DO = 1.1 x 10 m2/sec). A steady surface concentration of 1.5 at.% B prevails at this temperature. a) After diffusing for ½ hr at what location will a B content of 0.5 at.% be found? What will be the concentration of B at that location after 2 hrs of diffusion?
a person with a receiver is 5 km away from the transmitter .what is the distance that this person must move further to
air was heated by an electric resitance heater in an insulated piston-cylinder device. the piston weight remained
determine the reactions at pin locations a b and c as scalar components with a unit of kn for a force and kn-m for a
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a 3.27 m3 tank contains 100kg of nitrogen at 225 k. determine the pressure in the tank using the followinga the
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a piston cylinder assembly containing h2o initially has a temperature of 130degc and a specific internal energy of 700
1. imagine a thin cylinder of initial internal diameter do initial wall thickness to and initial fixed length
determine the critical load on a steel column having a square cross section 12 mm on a side with a length of 300 mm.
a closed tank has an enclosed airspace above the surface of water which fills the tank to a depth of something over a
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