PhysicsII Announced Quiz#2-2

A 2.5 m³ volume of gas has a pressure of 4.3 × 10⁵ Pa. What is the work done by the gas if it expands at constant pressure to 3.5 times its initial volume?

• 4.3 × 10⁵ J

• 1.1 × 10⁶ J

• 1.5 × 10⁶ J

• 2.7 × 10⁶ J

• !

The internal energy of a system decreases by 45.0 J. If 15.0 J of work is done by the system, how much energy is transferred to the system as heat?

• −675 J

• –180 J

• –60.0 J

• –30.0 J

• !

Heat is added to a system, and the system does 35.0 J of work. If the internal energy increases by 17.0 J, how much heat was added to the system?

• 2.06 J

• 18.0 J

• 52.0 J

• 254 J

• !

Heat is added to an open pan of water at 100.0°C, vaporizing the water. The expanding steam does 43.0 kJ of work, and the internal energy of the system increases by 604 kJ. How much energy is transferred to the system as heat?

• 647 kJ

• 540 kJ

• 986 kJ

• 458 kJ

• !

A compressor for a jackhammer expands the air in the hammer’s cylinder at a constant pressure of 5.9 × 10⁵ Pa. The increase in the cylinder’s volume is

4.05 × 10⁻⁴ m³. During the process, no energy is transferred out of the cylinder as heat.

a. What is the work done by the air?

b. What is the change in the air’s internal energy?

c. What type of ideal thermodynamic process does this approximate?