All Questions
8
questions
4
votes
6
answers
1k
views
Does work-energy theorem account for thermal energy?
Suppose a box (which I assume to be a rigid body) with an initial velocity that starts to slide on a level surface with friction. Imagine this experiment is done in vacuum, so there is no air drag or ...
- 61
2
votes
4
answers
115
views
Work in thermodynamics and work in mechanics
work in mechanics
$w=\vec{f} \cdot \vec{s}$
work in thermodynamics
$w=-p \Delta v$
I don't understand why $ \vec{f} \cdot \vec{s}= -p \Delta v$ ?
- 95
2
votes
2
answers
772
views
How does the work-energy theorem relate to the first law of thermodynamics?
The work energy theorem states that the net work on a particle is equal to the change in the kinetic energy of the particle:
$$W_{net}=\Delta K $$
My first question is whether this formula (the work-...
- 1,581
0
votes
1
answer
104
views
First principle of thermodynamics vs classical mechanics
please I need clarification about the first principle of thermodynamics, it's general statement is:
$$\Delta U + \Delta \text{KE} + \Delta \text{PE}= W + Q .$$
Supposing that: $ΔU = 0$ and $Q = 0$, ...
1
vote
2
answers
425
views
When we push on a wall, can we say work is being done on the atomic particles in contact with our hand?
Since textbooks say work is act transfer of energy, it led me to think of the following assumption:
Work is being done on the the atoms in the wall, in contact with the hands, when we push (hard) ...
- 885
0
votes
2
answers
39
views
On source of heat energy dissipation in a system
Suppose we have a block of mass m which was at rest on a rough floor and is now given an impulse towards a wall.It is given that the collision with wall is perfectly elastic and no energy is lost in ...
1
vote
3
answers
783
views
Comparing work in thermodynamics with work done in mechanics
Let us the consider a gas as our system enclosed in a cylinder with piston.
1st case(Expansion of gas):
Here force on the piston is exerted by the gas in upward direction and during expansion piston ...
- 79
0
votes
1
answer
404
views
Classical Mechanics -- Sign of work done
It seems that work has two possible ways to decide it's sign:
Whether you take the perspective of the system or the surrounding (whether you consider work done on the system as positive, or work done ...
- 1,585