1. Convert a temperature of 40oF to a. oC b. K c. oR
1. Convert a temperature of 40oF to
a. oC
b. K
c. oR
2. In a location where the local atmospheric pressure is 100 kPa
a. What is the equivalent absolute pressure of 40 kPa Vacuum?
b. What is the equivalent absolute pressure of 75 kPa Gage?
c. What is the equivalent absolute pressure at the base of a 20cm vertical column
of mercury if the density of mercury is 13.6 times more than water?
3. Air is inside a piston-cylinder arrangement initially at a pressure of 1.2 bar, temperature
of 77oC and a volume of 0.8 m3. The air is cooled at constant pressure until the volume is
halved. Determine the following:
a. The mass of air in the cylinder
b. The final temperature
4. Water is being heated in a closed pan on top of a range while being stirred by a paddle
wheel. During the process, 30 kJ of heat is transferred to the water, and 5 kJ of heat is
lost to the surrounding air. The paddle-wheel work amounts to 500 N ∙ m. Determine
the final energy of the system if its initial energy is 10 kJ.
5. 5 kg of H2O are contained in a closed rigid tank at an initial pressure of 20 bar and a
quality of 50%. Heat transfer occurs until the tank contains only saturated vapor.
Determine the volume of the tank, in m3, and the final pressure, in bar.
6. 1.2kg Air undergoes polytropic expansion from P1=1.5 bar, V1=0.66584 m3, to P2=1 bar,
V2=1.2054 m3. Calculate the amount of heat and work transfer if n=1.4.
7. Gaseous CO2 is contained in a vertical piston–cylinder assembly by a piston of mass 50
kg and having a face area of 0.01 m2. The mass of the CO2 is 4 g. The CO2 initially
occupies a volume of 0.005 m3 and has a specific internal energy of 657 kJ/kg. The
atmosphere exerts a pressure of 100 kPa on the top of the piston. Heat transfer in the
amount of 1.95 kJ occurs slowly from the CO2 to the surroundings, and the volume of
the CO2 decreases to 0.0025 m3. Friction between the piston and the cylinder wall can
be neglected. The local acceleration of gravity is 9.81 m/s2. For the CO2 determine (a)
the pressure, in kPa, and (b) the final specific internal energy, in kJ/kg.
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