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A long power transmission cable is buried at a depth (ground-to-cable-centerline distance) of 2 m. The cable is encased in a thin-walled pipe of 0.1-m diameter, and, to render the cable superconducting (with 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 superinsulator (ki =0.005 W/mK) of 0.05-m thickness and the surface of the earth (kg = 1.2 W/mK) is at 300 K, what is the cooling load (W/m) that must be maintained by a cryogenic refrigerator per unit pipe length?
a 250 mm bar of 15mm x 30 mm rectangular cross-section consists of two aluminum layers which are 5 mm thick each brazed
your company wants to launch a new product. rampd including prototypes and manufacturing process development will take
20 kg of water at 200 kpa with a quality 25 is heated under a constant volume process until its pressure reaches 400
a skydiver jumps from a ballon and falls freely for 6 seconds. her parachute then opens decelerating her at a constant
a simple pulley with the given radius r used to lift heavy objects is positioned 10 feet above ground level. Given that the pulley rotates theta degrees, determine the height to which the pulley is lifted.
you are designing an ex vivo artificial organ. the cells in the organ cannot tolerate shear stress in excess of 0.5 gcm
as a cars gas tank is filled gasoline vapors in the tank are displaced and may be emitted into the atmosphere. for this
a two-engine jet transport has a loaded weight of 90000 lb and a forward thrust of 9800 lb per engine during takeoff.
assume that the amount of heat generated in the furnace above was used to heat helium to 600oc. an engine operating in
three lbm of a substance is made to undergo a reversible expansion process within a piston-cylinder device starting
water is contained in a closed rigid tank of volume 0.3 m3 at an initial pressure of 4 bar and a quality of 66. heat
a pipe in a manufacturing plant is transporting superheated vapor at a mass flow rate of 0.3 kgs. the pipe is 10 m long
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