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Air contained in a rigid, insulated tank fitted with a paddle wheel, initially at 4 bar, 40oC and volume of 0.2 m^3, is stirred until its temperature is 500 K. Assuming the ideal gas model for the air, determine the amount of entropy produced, in kJ/K. Assume variable specific heats (data from Table A-22).
a tank of capacity 5000 gal is filled with 500 gallons of pure water. solution containing 2 lbgal of salt is pumped in
a droplet of water diameter 100 um is falling through 20oc air at the terminal velocity of 0.298 ms. the relative
a device with no moving parts provides a steady stream of chilled air at -25c and 1 bar. the feed to the device is
asers can be used to drill or cut material. one such laser generates a series of high-intensity pulses rather than a
A supply of steam at a pressure of 4 MPa and a temperature of 332°C (state 1) is used to do mechanical work as it expands to a pressure of 100 kPa and a quality of 90% (state 2). During the expansion process, 60 kJ/kg of heat is removed from the wate..
apple juice at 20c is siphoned from a large tank using a constant-diameter hose. the end of the siphon is 1m below the
A person with glasses enters a heated room at 22oC, after spending some time in the cold (the glasses are at 1oC). The glasses start to fog. Find the minimum value of the relative humidity in the room.
In coal gasifiers, refractories and metals must withstand the coal/air or coal/oxygen combusting atmospheres. The Zr-Nb-Ti system is under consideration as alternative to the Fe and Ni alloy systems because the coal combustion degrades these alloy sy..
saturated steam at 2 mpa is contained in a piston-cylinder device. the initial volume is 0.25 m3. heat is slowly
As a game, slide a matchbook across a table, trying to make it stop at some predefined point on each attempt. Measure the distance from the starting point to the stopping point. Repeat this 10, 20, through 50 times. Plot the frequency distribution fr..
in space a novel heat rejection scheme that has been proposed for heat dissipation is termed a liquid droplet radiator
refrigerant 134a at -10degc 1.4 bar and a mass flow rate of 280 kghr enters an insulated compressor operating at steady
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