# All Questions

132,853 questions
88 views

### Is rotation absolute? [duplicate]

I was reading an article that rotation instead of linear motion is absolute. Can anyone explain why? Shouldn't an observer (A) moving in a circle around a point in an object that rotates (with respect ...
21 views

### See-saw with springs attached on both ends [on hold]

Hello, I have question regarding following task; we have see-saw that weighs 2kg and on each end there is a spring that is connected both to the ground and see-saw. Coefficient of the spring is 10000 ...
9 views

### lux intensity meaured through the maxima and minima of a 15000 per inch diffraction grating [on hold]

What is the lux intensity measured through the maxima and minima of a 15000 lines per inch diffraction grating?
27 views

### How does Alain Connes NCG compare phenomenologically with superstring theory?

In Veltmans book on QFT, diagrammatica, the full SM Lagrangian is published. There are more than a hundred terms and it looks pretty uninspiring and not quite the kind of equation one would want to ...
59 views

### Lagrangian equations of motion for ball rolling on turntable

The equations governing the motion of a ball of mass $m$, radius $R$ rolling on a table rotating at constant angular velocity $\Omega$ which are derived using Newton's laws are: (I present these for ...