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Phy 102 Chapter 12 Exam Questions and Correct Answers Latest Update 2024 ( Graded A+) R151,20
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Phy 102 Chapter 12 Exam Questions and Correct Answers Latest Update 2024 ( Graded A+)
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Phy 102 Chapter 12 Exam Questions and Correct Answers Latest Update 2024 ( Graded A+) A 4-mol ideal gas system undergoes an adiabatic process where it expands and does 20 J of work on its environment. What is its change in internal energy? a. 5 J b. 20 J c. zero d. +20 J - Answers b. 20 J I...

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Phy 102 Chapter 12 Exam Questions and Correct Answers Latest Update 2024 ( Graded A+)

A 4-mol ideal gas system undergoes an adiabatic process where it expands and does 20 J of work on its
environment. What is its change in internal energy?

a. 5 J

b. 20 J

c. zero

d. +20 J - Answers b. 20 J

In a certain thermodynamic process, 20 cal of heat are removed from a system and 30 cal of work are
done on the system. The internal energy of the system . . .

a. increases by 50 cal

b. decreases by 50 cal

c. decreases by 20 cal

d. increases by 10 cal

e. decreases by 10 cal - Answers d. increases by 10 cal

A car of mass 2000 kg is traveling at 22.0 m/s on a day when the temperature is 20.0 C. The driver steps
on the breaks and stops the car. By how much does the entropy of the universe increase?

a. 4.8x10^5 J/K

b. 0.15 kJ/K

c. 1.6 kJ/K

d. 24 kJ/K

e. 3.3 kJ/K - Answers c. 1.6 kJ/K

The diagram shows the state of an ideal gas going from an initial to a final state. Which path does the
most work on the surroundings?

a. 1

b. 2

c. 3

d. 4

, e. none of the others - Answers a. 1 (the line that is horizontal - constant pressure; isobaric)

What is the entropy change when 4 kg of water at 0 C is frozen into 4 kg of ice at 0 C?

a. 1340 kJ/K

b. -33 kJ/K

c. 4.9 kJ/K

d. -4.9 kJ/K

e. an infinite change - Answers d. -4.9 kJ/K

The surface of the Sun is approximately 5,700 K and the temperature of the Earth's surface is about 290
K. What total energy change occurs when 1,000 J of heat energy is transferred from the Sun to the
Earth?

a. 3.26 J/K

b. 2.89 J/K

c. 3.27 J/K

d. 9.87 J/K - Answers c. 3.27 J/K

A Cornot engine operating between reservoir temperatures of 340 C and 40 C has an efficiency of . . .

a. 88.2%

b. 37.5%

c. 49.0%

d. 62.5%

e. 60.0% - Answers c. 49.0%

A heat engine with an output of 300 W has an efficiency of 25% and works at 10 cycles/s. How much
heat is absorbed (Qh) and how much rejected (Qc) in each cycle?

a. Qh = 1200 J, Qc = 900 J

b. Qh = 1500 J, Qc = 1200 J

c. Qh = 40 J, Qc = 10 J

d. Qh = 150 J, Qc = 120 J

e. Qh = 120 J, Qc = 90 J - Answers e. Qh = 120 J, Qc = 90 J

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