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A plane wall 15 cm thick has a thermal conductivity given by the relation k = 2.0 + 0.0005*T W/mK. where T is in Kelvin. If one surface of this wall is maintained at 150 C and the other at 50 C, determine the rate of heat transfer per square meter. Sketch the temperature distribution through the wall.
an automobile having a mass of 2 mg travels up a 7 degree slope at a constant speed of v100 kmh. if mechanical friction
let it cool back to the outdoor temperature, pass it through a turbine, and discharge the cold air leaving the turbine into the house. from a thermodynamic point of view, is the proposed system sound?
a spring-mass is excited by a force f0sinomegat. at resonance the amplitude is measured to be 0.58 cm. at 0.80 resonant
With reference to basic constructional features, contrast the methods of compression employed by positive displacement and dynamic air compressors.
Assuming that the air is 80°F and 1 atm and blows across the wall as on a flat plate, estimate the average temperature the wall will attain for equilibrium conditions.
a roughing section of a broach is to remove stock 3.2 mm deep from a steel surface205 mm long x 50 mm wide each tooth
Consider a magnet moving in a coil of N, turns. This system can be modelled as mass spring damper system. The damping coefficient consist of both mechanical and electromagnetic damping. How can I calculate the mechanical electromagnetic damping?
a cycle using helium in a piston-cylinder device starts at t1 300 k and p1 0.2 mpa. the helium is then compressed
a spinning dartboard is used in a carnival game. the board is .4 m by .27 cm and has a mass of 950 grams. the operator
india has a land area of 2.97 x 106 km2 57 of which is cropland. if 5 of the cropland were dedicated to producing
liquid water is cooled at a constant pressure of 200 kpa in a piston-cylinder device from a temperature of 110 degc to
the fluid used is r-134a. the flow of r-134a is 70 lbmmin. if r-134a enters a compressor at -10 deg f and is a
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