Intenal energy increase in wind of star ?

[sam_021]

Homework Statement

If a big star gives of wind , forming shock and then a bubble .. And then this bubble is driven by pressure
Also as the bubble expands the surrounding mass gets added to it
Does it make sense for the Total energy to increase ?

Homework Equations

The Attempt at a Solution

 

[berkeman]

Homework Statement

If a big star gives of wind , forming shock and then a bubble .. And then this bubble is driven by pressure
Also as the bubble expands the surrounding mass gets added to it
Does it make sense for the Total energy to increase ?

Homework Equations

The Attempt at a Solution

What are your thoughts? How do you define Total Energy? What source of energy is driving the surface activity on a star?

 

[sam_021]

What are your thoughts? How do you define Total Energy? What source of energy is driving the surface activity on a star?

total energy = thermal + Kinetic

Star gives off mechanical energy, then forming shocks which inturn heats up the surrounding, thus driving the shock via pressure

I would say that the total energy decreases ?
Just from simply looking at the equations Thermal=3/2PV and Ek=0.5mv^2

but I have results that contradict that :(

 

[sam_021]

anyone ?

 

[asteriatic]

Yes, it does make sense for the total energy to increase in this scenario. The internal energy of the wind of a star is a combination of its kinetic energy (from its motion) and its thermal energy (from its temperature). As the wind forms a shock and creates a bubble, the kinetic energy of the wind is converted into thermal energy due to the increase in pressure. This results in an increase in the internal energy of the wind.

Furthermore, as the bubble expands and incorporates surrounding mass, this adds more kinetic and thermal energy to the system, resulting in an overall increase in total energy. This increase in total energy is a natural consequence of the laws of thermodynamics, which state that in an isolated system, energy cannot be created or destroyed, only transferred or converted from one form to another.