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A long power transmission cable is buried at a depth (ground to cable centerline distance) of 2 meters. The cable is encased in a thin-walled pipe of 0.1-meter diameter, and to render the cable superconducting (essentially zero power dissipation), the space between the cable and pipe is filled with liquid nitrogen at 77 K. If the pipe is covered with a super-insulator (ki = 0.005 W/m-K) of 0.05-meter thickness and the surface of the earth (kg = 1.2 W/m-K) is at 300 K, what is the cooling load in W/m that must be maintained by a cryogenic refrigerator per unit pipe length?
Air at 90 kpa and -7 C enters an adiabatic diffuser steadily with a velocity of 180 m/s and leaves with a low velocity at a pressure of 100 kpa. The exit area of the diffuser is 5 times the inlet area. Determine (a) the exit temperature and (b) th..
in a chain link fencing machine if we are using 2mm gi wire at the feed of 10mm per second through a self centering
Newtons laws describing equations of motion for balance beam with cart (ball), Need to obtain a working mathematical model of the balance beam problem, preferably with a cart, not a ball
a piston-cylinder device initially contains 1.2 kg of steam with a volume of 0.2 m3. the mass of the piston is such
which emits more sox per unit amount of electricity produced a coal-fired plant with a 90 efficient so2 scrubber or an
the piston of a piston-cylinder device containing gas has a mass of 60kg and a cross-section area of 0.04m. the local atmospheric pressure is 0.97bar, and the gravitational acceleration is 9.81ms. determine the pressure inside the cylinder?
Average pressure at end of stroke? Upsetting force required at the end of the stroke? If friction is neglected, what is the amount of upsetting force?
to conserve water and energy a flow reducer is installed in the shower head shown here. if the pressure at point 1
a gas-turbine power plant operates on a simple brayton cycle with air as the working fluid. the air enters the turbine
A large tower is to be supported by a series of steel wires; it is estimated that the load on each wire will be 13,300 N (3000 lbf). Determine the minimum required wire diameter, assuming a factor of safety of 2 and a yield strength of 860 MPa (12..
air at 80 kpa and 127 degrees celsius enters an adiabatic diffuser steadily at a rate of 6000 kghr and leaves at 100
the allowable shearing stress is 15ksi in a steel rod ab and 8ksi in a brass rod bc. knowing that a torque of magnitude
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