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a) The room-temperature electrical conductivity of a semiconductor specimen is 25 (ohm-m)-1. The whole concentration is known to be 2.5E+19 m-3. The electron and hole mobilities for this material are 0.38 and 0.18 m2/V·s, respectively. Compute the electron concentration. (Use scientific notation.) b) On the basis of the result in part (a), is the specimen intrinsic, n-type extrinsic, or p-type extrinsic?
a uniform beamoflength l flexural rigidity ei and cross-sectional plastic moment mp is built-in at both ends and
water is the working fluid in a regenerative rankine cycle. the pressure and temperature at the turbine inlet are 8mpa
Note that the positive y direction is downward and counterclockwise torques are positive. find alpha the angular acceleration?
at the beginning of the compression stroke the volume of a certain diesel engine cylin-der is 1.000 liter and it is
an experiment was carried out to calculate forces acting in two members of a pin-jointed framework due to different
an insulated piston-cylinder device initially contains 10kg saturated liquid water at 200kpa. now water steam at 0.5mpa
given the following operating conditions for a rolling bearing what lubricant would you select and what is the reason
Consider a supersonic wind tunnel with test section Mach number of 2 and fixed geometry diffuser designed to operate with minimum stagnation pressure losses (smallest diffuser area).
What is the force P to keep the system in equilibrium for the angles specified?
Refrigerant 134a enters a 28-cm diameter pipe steadily at 200 kPa and 20C with a velocity of 5 m/s. The refrigerant gains heat as it flows through the pipe and leaves the pipe at 180 kPa and 40 C.
a horizontal cylinder is separated into two sections by an adiabatic frictionless piston. one section contains 0.2 m3
the 30 mg aircraft is climbing at the angle theta15 with a thrust t of 180 kn. at the instant shown its speed is 300
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