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A piston-cylinder device contains helium gas initially at 145 kPa, 20 degrees C, and 0.5 m^3. The helium is now compressed in a polytropic process (PV^n = constant) to 400 kPa and 140 degrees C. Determine the heat loss or gain during this process.
a collar having a mass of 0.75 kg and negligible size slides over the surface of a horizontal circular rod for which
a 25-mm-diameter steel column with a length of 950 mm was analyzed to determine the critical buckling load. the column
an hydraulic turbine operates under an available head of 85 m at a flow rate of 0.25 m3s. the electrical power output
2-lbm of water at 300 psia fill a weighted piston-cylinder device whose volume is 2.5 ft3. the water is then heated at
a truck traveling at vo 60mph when the driver applies the brakes to come to stop the deceleration of the truck is
a team of engineering students is designing a catapult launch a small ball at a so that land in the box . it is known
if the axial-flow pump is used to deliver 65000 galmin of 30oc water at 1200 rmin estimate a the impeller diameter b
an egg initially at rest is dropped onto a concrete surface it breaks. prove that the process is irreversible. in
What specific materials are used for solar cells? What specific properties these materials process in order for the solar cells to the function properly?
refrigerant 134a enters the expansion valve of a refrigeration systems at a pressure of 1.0mpa and a temperature of 34
the area of the pacific ocean is 64186000 square miles and its average depth is 12925 ft. assuming that the weight per
Weld analysis, Two steel plates are joined with a butt weld using a weld throat h of 3/8 in. and the length of weld 1 of 4in.
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