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A circular transistor of 10-mm diameter is cooled by impingement of an air jet exiting a 2-mm-diameter round nozzle with a velocity of 20 m/s and a temperature of 15°C. The jet exit and the exposed surface of the transistor are separated by a distance of 10 mm.
If the transistor is well insulated at all but its exposed surface and the surface temperature is not to exceed 85°C, what is the transistor's maximum allowable operating power?
two kilograms of air within a piston-cylinder assembly executes a carnot power cycle with maximum and minimum
The virial equation of state for n-butane at 460K is Z=1+A/V+B/V^2 in which A =-265 cm^3/g and B= 30250 cm^6/(g*mole^2). Calculate the work required to reversibly compress one mole of n-butnae from 50 atm to 100 atm at 460K
you are designing a mobile device to extract water from a well through a tube. assume your device is able to create a
a furnace is hsaped like a long equilateral-triangular duct where the width of each side is 2 m. heat is supplied from
a for a rectangular coordinate system we developed the navier stokes equation for vx. now reduce that equation to
Assume that the concentration profile for species A in the concentration boundary layer is of the form CA( y) = Dy2 + Ey + F, where D, E, and F are con- stants at any x-location and y is measured along a normal from the surface.
A house is maintained at steady state (closed system) at 300 K while the outside temperature is 280 K. The heat loss is measured at 2 kW. Two approaches are being considered:
Which agency helps assure that all forms of transportation are operated safely by investigating transportation accidents and developing recommendations for other government agencies and transportation industries regarding transportation safety, tr..
a spring is initially compressed from a free length of 8in to a length of 6in making a net initial compression of 2in.
Determine the area of the triangle that is made up by the intersection of the planes in (g) if the plane of OA includes point O, the plane of DB includes point D, and the plane of EB includes point E.
air flows through a well-insulated nozzle operating at steady state. at the inlet the pressure is 4 bar the temperature
two particles of equal weight are released from rest on a 35 degree incline when they are 20 m apart. the coefficient
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