Thermodynamics Need help for AP test in 40 minutes

In summary: OUNT OF WORK DONE BY THE GAS IS POSITIVE.In summary, the conversation discusses thermodynamics and the calculation of work done by and on a gas during an isothermal expansion. It is mentioned that the work done by the gas can be calculated using integrals, and the resulting value will always be positive.
  • #1
ƒ(x)
328
0
Thermodynamics! Need help for AP test in 40 minutes!

Lets say that you have a gas that starts at an initial pressure P, volume V, and temperate T.

Then it undergoes an isothermal expansion, during with pressure decreases and volume increases.

What is the work done BY the gas during the transition?
What is the work done ON the gas during the transition?

Now, if I want to do this with integrals (i.e. area under the curve), for work done BY the gas, would it be the POSITIVE AREA under the curve?
 
Physics news on Phys.org
  • #2


about 20 minutes now...anyone?
 
  • #3


ƒ(x) said:
Lets say that you have a gas that starts at an initial pressure P, volume V, and temperate T.

Then it undergoes an isothermal expansion, during with pressure decreases and volume increases.

What is the work done BY the gas during the transition?
What is the work done ON the gas during the transition?

Now, if I want to do this with integrals (i.e. area under the curve), for work done BY the gas, would it be the POSITIVE AREA under the curve?
Yes. Work done by the gas is [itex]\int Pdv[/itex]. If dv is positive, the integral (area under PV graph) is positive.

AM
 

1. What is thermodynamics?

Thermodynamics is the branch of physics that deals with the relationships between heat, energy, and work. It studies how energy is transferred between different systems and how it affects the properties and behavior of matter.

2. What are the laws of thermodynamics?

The laws of thermodynamics are fundamental principles that describe the behavior of energy in physical systems. The first law states that energy cannot be created or destroyed, only transferred or transformed. The second law states that the total entropy (disorder) of a closed system will always increase over time. The third law states that as the temperature of a system approaches absolute zero, its entropy also approaches a constant minimum value.

3. How is thermodynamics applied in real life?

Thermodynamics has many practical applications, such as in the design and operation of engines, refrigeration and air conditioning systems, power plants, and chemical processes. It is also essential in understanding weather patterns, ocean currents, and the Earth's climate.

4. What is the difference between heat and temperature in thermodynamics?

Heat is a form of energy that is transferred between two systems or objects due to a temperature difference. Temperature, on the other hand, is a measure of the average kinetic energy of the particles in a system. In thermodynamics, heat is the cause of temperature change, but the two are not the same.

5. How can I prepare for a thermodynamics test in a short amount of time?

To prepare for a thermodynamics test in a short amount of time, it is important to review the key concepts, equations, and definitions. Practice solving problems from previous tests or homework assignments and make sure to understand the steps and reasoning behind each solution. It may also be helpful to create flashcards or study guides to help with memorization. Additionally, getting a good night's sleep and staying focused during the test can greatly improve performance.

Similar threads

Isothermal, isobaric and adiabatic
    • Introductory Physics Homework Help
Replies
6
Views
1K
Is the change in internal energy really a state function?
    • Introductory Physics Homework Help
Replies
4
Views
856
Trouble solving for end state of two control volumes in a rigid tank
    • Introductory Physics Homework Help
Replies
12
Views
850
I Focus Problem for Entropy Change in Irreversible Adiabatic Process
    • Thermodynamics
2
Replies
56
Views
3K
Work done by gas and balloon?
    • Introductory Physics Homework Help
Replies
11
Views
3K
Stationary vertical cylinder with heavy piston
    • Introductory Physics Homework Help
Replies
3
Views
2K
Thermodynamics of an Insulated Box: Water-Steam Question
    • Introductory Physics Homework Help
Replies
1
Views
2K
Thermodynamics First Law Question
    • Introductory Physics Homework Help
Replies
4
Views
2K
Calculating work of Otto cycle stages - Thermodynamics.
    • Introductory Physics Homework Help
Replies
1
Views
2K
I Irreversible adiabatic processes & entropy change (clarification needed)
    • Thermodynamics
Replies
22
Views
2K

Hot Threads

Recent Insights

Back
Top