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A certain p-type semiconductor has a band gap of 0.8 eV, the acceptor levels being 0.03 eV above the valence band. What is the minimum density of acceptor atoms (in number per cubic meter) that would ensure that the semiconductor remains p-type up to a temperature of 400 K?
A constant force of F is applied to a block of weight w located on an inclined surface with angle of and friction coefficient u. A spring is acting on the block with constant K. if initially spring was compressed by distance d. Find velocity of block..
calculate the transverse modulus of the peek/carbon fiber composite with 30% volume fraction by tow method. the modulus of peek is 3.8 GPa and the modulus of the carbon fiber is 400GPa. assume the reinforcing factor.
water flows from a large tank through a 20-m long 3 cm by 2 cm rectangular pipe. flow exits from the tube with velocity
a piston-cylinder device contains 5 kg of r134a at 800 kpa and 60 c. the refrigerant is now cooled at constant pressure
the air with constant properties in a steady adiabatic flow enters a system at a pressure of 10 bars and 500k with a
air enters the 1cm2 inlet of an aircraft engine at 100kpa and 10degreec with a velocity of 200ms. determine the volume
A 3.03-ft3 rigid tank contains saturated refrigerant- 134a at 100 psia. Initially, 17 percent of the volume is occupied by liquid and the rest by vapor. A valve at the top of the tank is now opened, and vapor is allowed to escape slowly from the tank..
1.Discuss whether you think OSHA's air contaminant standards are important, and why. Do you think they are adequate to protect employees in the workplace from airborne contaminant hazards? Explain.
ln a study of the properties of a liquid a 2-kg sample of liquid was heated at a constant pressure of 1 atm from 500 to
The 52 kg block shown starts from vast at position A and slides down the Inclined plane to position B. What is most nearly the velocity of the block at position B
in an industrial plant liquid is to be pumped from a storage tank through a system of pipes fittings and instruments to
One such example is the stirring of tea leaves in a teacup. Obtain information about "Einstein's tea leaves" and investigate some of the complex fluid motions interacting with the leaves. Summarize your findings in a brief report.
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