Recent content by qnach

I have encountered the name "sum rules" in many places, such as EM, acoustics,... But I understand none. In what kind of situation will a sum rule occurs? What does it said exactly?

TL;DR Summary: The theory for ears are well developed so far. Is there a more authorative book or paper? Where can I find a good book or a paper?

The friction law I learnt in high-school is Coulomb law, to my understanding. But what is Stribeck law? What is the difference from Coulomb's law?

There are differential cross section, double differential cross section, triple DCS. What are the difference, and why is the names? Thanks.

Summary:: I remember seeing somewhere that people said Lamb's Hydrodynamics is so dry that the reader cannot see any water but drawn in a desert. But where did it come from ? I remember seeing somewhere that people said Lamb's Hydrodynamics is so dry that the reader cannot see any water but...

Many ancient journals were scanned into PDF files. What I don't know is how could these pages become mark-able and search-able? They should only be images.

I have access to only one side of the plate, i.e. cannot clamp both sides of the plate to measure. Is there any way, perhaps acoustic methods, to measure a plate thickness from only one side?

How did you got the result? I am not sure about the \sin \theta, but the force F should be P presumably.

Yes, your criticism is correct. The force is not large, therefore will not result in large deformation hence can be considered as inelastic. Deformation, such as sands are deformable but inelastic.

I have a V-shape depression (2-dimensional) with inelastic but deformable material filled. If the material is pressed atop, how much force will be experienced by the sides?

Is there any book discuss these methods?

Is the partition function used in number theory and statistical mechanics the same thing?

So...what are the other techniques?

Could you show me your work?

Whatever that is you never told me anything. http://aven.amritalearning.com/index.php?sub=99&brch=290&sim=1452&cnt=3307 I want to calculate such a shadow.