RC - GEAS 2

1. In a partially elastic collision between two objects with unequal mass:

• the velocity of one will increase by the amount that the velocity of the other decreases.

• the momentum of one will increase by the amount that the momentum of the other decreases.

• the energy of one increases by the amount that the energy of other decreases.

• the total momentum of the system will decrease

2. A cylinder contains 7.0 g of nitrogen gas. How much work must be done to compress the gas at a constant temperature of 80°C until the volume is halved?

• 504 J

• 508 J

• 510 J

• 506 J

3. An ideal gas (k = 1.4), with an initial specific volume of 30 cubic meters per kilogram, experiences an isothermal compression from 200 kilopascals to 800 kilopascals. What is the final specific volume of the gas?

• 7.5 m³/kg

• 11.14 m³/kg

• 75 m³/kg

• 120 m³/kg

4. A piston and cylinder system contains 3 kg of air at 15°C. In an isothermal compression in which the final volume is one-third of the initial volume, how much boundary work has been performed?

• – 272 kJ/kg

• – 265 kJ/kg

• – 227 kJ/kg

• – 256 kJ/kg

5. The SI unit for absolute temperature is ______.

• Kelvin

• Celsius

• Rankine

• Fahrenheit

6. What is the efficiency of an air standard Brayton cycle that operates with a 4:1 pressure ratio?

• 43 %

• 33 %

• 53 %

• 35 %

7. If 4 kg of carbon monoxide gas is introduced into a 5.3 m³ vessel at 25°C, what is the pressure of the gas?

• 65.90 kPa

• 67.44 kPa

• 64.37 kPa

• 66.78 kPa

8. What properties are determined by dividing the value of an extensive property by the mass of the system?

• Chemical properties

• Relative properties

• Specific properties

• Intensive properties

9. What is the coefficient of performance of a Carnot refrigerator operating between 20°F and 75°F?

• 6.5

• 7.8

• 5.6

• 8.7

10. What properties are proportional to the mass of the system?

• Intensive properties

• Specific properties

• Relative properties

• Extensive properties