# Recent content by kayan

1. ### Gibbs' theorem and partial molar volume

Not meaning to bash Smith and VN at all. In fact, it's one of the only thermo books I've read that discusses this topic in any degree. I just wished they would've explained more since they are my only source on the subject!
2. ### Gibbs' theorem and partial molar volume

Framing the question is definitely part of the problem, because since V, U, & H for an IG can all be evaluated at the total P, then Gibbs theorem seems to be the exception instead of the rule, with the exception being S (and anything related to S). I don't know what kind of answer I was looking...
3. ### Gibbs' theorem and partial molar volume

In the chemical engineering text of Smith, VanNess, and Abbott, there is a section on partial molar volume. It states that Gibbs theorem applies to any partial molar property with the exception of volume. Why is volume different? In other words, when evaluating the partial molar volume of a...
4. ### Analysis of tennis string tension

Awesome find. This is what I've been looking for. I'm glad it somewhat validates mine/your thoughts about ball deformation causing more energy loss. However, the thing that I still cannot wrap my mind around is using conservation of momentum to view this situation. Momentum is always conserved...
5. ### Analysis of tennis string tension

Obviously, it's not tennis without the player. But your answers were far off-topic, so I wanted to get you to think about it in a physics sort of way. Simplifying the situation to just a fixed racquet and a dropped ball is still helpful. This is what much of physics is about, simplifying nature...
6. ### Analysis of tennis string tension

I don't like the link you posted b/c it's just rehashing the same old information I've always heard in the tennis community without explanation. However, the 2nd point you bring up about ball deformation is actually something that I have wondered about. Could it be that since tighter strings...
7. ### Analysis of tennis string tension

This isn't really answering my question of whether or not there is any truth to the "loose strings give power, tight strings give control" claim. I'm looking for a scientific explanation of why looser strings would generate more power in a shot. If it helps, take the person swinging the racquet...
8. ### Analysis of tennis string tension

You're reply only confuses me. Assuming that the loose fishing net is elastic, then in my conceptual model, it wouldn't change how fast the ball leaves the racquet. No energy is lost, therefore, it all ends up back in the ball as kinetic energy. Right? Also not sure what you're talking about...
9. ### Analysis of tennis string tension

I have a decent background in physics, but something that has always confused me is how to think about how the tension of the string in a tennis racquet affects how the ball leaves the strings. For example, the traditional lore in tennis is that tauter strings will give more control, whereas...
10. ### Why does Planck's BB emissive power increase with n?

Does anybody else have an explanation? Still haven't heard an answer that makes sense to me.
11. ### Why does Planck's BB emissive power increase with n?

Let's talk about specifics. Say there is a BB sphere in a vacuum, and then there is a medium with n>1 after light passes through the vacuum. So you're saying that the reason the emissive radiation increases is because the radiation emits from the BB, travels through the vacuum, then some of it...
12. ### Why does Planck's BB emissive power increase with n?

Not sure if that makes sense to me. First of all, can you describe the geometry a little better (spherical, a wall, etc)? Second of all, you mentioned "reflection", however, Planck's law doesn't say anything about reflection. It is only describing the power intensity radiating from a BB. If...
13. ### Why does Planck's BB emissive power increase with n?

This question is regarding the dependence of Planck's law for black-body (BB) radiation intensity (or integrating over a hemisphere, the emissive power, E = pi * I). Physically speaking, why is it that a BB emitting in a medium with n>1 (n being index of refraction) emits a higher power/area...
14. ### Basic Thermodynamics Question

Yes, the answer is that the water in the microwave gets superheated: heated to a temperature beyond its boiling point, but it does not boil. Then, when you add your tea ball to the water, it provides the "activation energy" and starts the boiling process via nucleation sites. Also, FYI, the...
15. ### 1st law: Thermo equation 6.1 from Smith, Van Ness, Abbott

I tried to be as clear as possible (stating that I understood state variables, hence that was not my source of confusion), and apparently it was communicated well enough for the poster below to perceive the correct question and answer it. This is what I needed, thanks.