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  3. 3 gas in a piston follows a pv relation pvsconstant...

Question: 3 gas in a piston follows a pv relation pvsconstant...

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3. Gas in a piston follows a p-v relation: pvsconstant. If the piston is charged with a 2.9-kg gas initially at 250 kPa with 1.5 m2. The final pressure is 100 kPa. Estimate the final specific volume in m/kg, and sketch the process on p-v diagram. 4. A barometer contains mercury with density 13.50 g/cm3 is placed in a room at pressure 100 kPa and temperature 25°C with gravity 9.81 m/s?. Determine the height of mercury (i.e., the reading of the barometer) in the column in two units: mmHg and inHg. 5. 1 atm pressure is imposed on the top of the 0.5-meter-diameter piston. The gage pressure of the air below the piston is 1.2 kPa. The acceleration of gravity is g 9.81 m/s. A mass is then placed on the top of piston so that the piston is pushed to a lower position. At this moment, the gage pressure of the air below the piston is 2.8 kPa. Estimate the mass of the piston and the mass of the added object, both in kg.
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