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...
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
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller TutorJosh. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $7.99. You're not tied to anything after your purchase.
