Thermodynamics Homework: Solving the Mystery of Internal Energy Change

The first law of thermodynamics states that in an adiabatic process, the change in internal energy is equal to the work done by the gas on the surroundings. In this case, since the work done is negative, the change in internal energy is positive. This means that the temperature of the gas increases, even though no heat was transferred. This is similar to compressing air with a bicycle pump. In summary, the internal energy can change in an adiabatic process without any heat flow, due to the work done by the gas on the surroundings. This results in an increase in temperature, similar to compressing air
  • #1
Arun Raja
17
0

Homework Statement


64ec3897b4.png


Homework Equations


Conceptual qn

The Attempt at a Solution



work is done in gas but how can internal energy change?
there is no heat flow since it is an adiabatic process[/B]
 
Physics news on Phys.org
  • #2
Thanks for the post! Sorry you aren't generating responses at the moment. Do you have any further information, come to any new conclusions or is it possible to reword the post?
 
  • #3
From the first law, for an adiabatic process, ##\Delta U=-W##, where W is the work done by the gas on the surroundings. In this situation, W is negative (the surroundings do work on the gas), so that ##\Delta U## is positive. The temperature of the gas actually rises, even though no heat was transferred to the gas. This is the same thing that happens when you compress air with a bicycle pump.

Chet
 

What is thermodynamics?

Thermodynamics is the branch of physics that studies the relationship between heat, energy, and work, and how they are affected by changes in temperature, pressure, and volume.

What are the laws of thermodynamics?

The laws of thermodynamics are fundamental principles that govern the behavior of energy in a system. They include the first law, which states that energy cannot be created or destroyed, only transferred or converted, and the second law, which states that the total entropy of a closed system will always increase over time.

What is the difference between heat and temperature?

Heat and temperature are often used interchangeably, but they have different meanings in thermodynamics. Heat is the transfer of energy from one object to another due to a difference in temperature. Temperature, on the other hand, is a measure of the average kinetic energy of the particles in a substance.

What is the significance of the Carnot cycle in thermodynamics?

The Carnot cycle is a theoretical thermodynamic cycle that represents the most efficient way to convert heat into work. It is significant because it sets the upper limit for the efficiency of any heat engine, and it provides a model for understanding the behavior of real-world systems.

How is thermodynamics applied in everyday life?

Thermodynamics has numerous applications in everyday life, including heating and cooling systems, engines and power plants, refrigeration and air conditioning, and cooking. It also plays a crucial role in understanding climate change and the behavior of materials and substances in different environments.

Similar threads

  • Introductory Physics Homework Help
Replies
1
Views
827
  • Introductory Physics Homework Help
Replies
10
Views
999
  • Introductory Physics Homework Help
Replies
6
Views
1K
  • Introductory Physics Homework Help
Replies
4
Views
785
  • Introductory Physics Homework Help
Replies
3
Views
950
  • Introductory Physics Homework Help
Replies
5
Views
763
  • Introductory Physics Homework Help
Replies
4
Views
1K
  • Introductory Physics Homework Help
Replies
4
Views
607
Replies
5
Views
276
  • Introductory Physics Homework Help
Replies
33
Views
1K
Back
Top