# Recent Content by mfb

1. Post

### B Simple question on compactness

[0,1] is compact, but your argument does not show that there must be such a finite collection. No, there are finite covers of it. (0,1) itself is...
Post by: mfb, Feb 23, 2018 at 12:11 AM in forum: General Math
2. Post

### Could this bulb resistance problem be modified ?

It always gets brighter. L1 always gets dimmer, which means the voltage at L1 drops, this means the voltage at L2 increases.
Post by: mfb, Feb 22, 2018 at 8:50 PM in forum: Introductory Physics Homework
3. Post

### Kepler's 3rd law and a binary system

Can't you just swap m1 and m2 in the diagram? It shouldn't matter, the situation is symmetric.
Post by: mfb, Feb 22, 2018 at 6:31 PM in forum: Introductory Physics Homework
4. Post

### B If you condense an atom, would it make a black hole?

There is nothing you could "condense" about an atom. A condensed group of atoms is a liquid or a solid. In both cases there is no black hole....
Post by: mfb, Feb 22, 2018 at 6:29 PM in forum: General Physics
5. Post

### B Compactified/Curling 1D = 2D?

The image can be misleading. If it has that at all. I'm not aware of any model that would predict this.
Post by: mfb, Feb 22, 2018 at 6:17 PM in forum: General Math
6. Post

### I Mass of bound particles

Oh, I meant nucleon where I wrote nucleus. It was still true, but not what I wanted to say.
Post by: mfb, Feb 22, 2018 at 5:04 AM in forum: Special and General Relativity
7. Post

### I Why is the Uncertainty principle inherent to particles?

The uncertainty principle is not about measurements. The particles do not have an exact position and momentum, so attempts to measure both will...
Post by: mfb, Feb 22, 2018 at 4:42 AM in forum: Quantum Physics
8. Post

### B Compactified/Curling 1D = 2D?

It is not a process. I have no idea how to make it clearer than that, sorry. If you don't understand "it is not a process" I cannot help here.
Post by: mfb, Feb 21, 2018 at 7:50 PM in forum: General Math
9. Post

### B Compactified/Curling 1D = 2D?

See above: It is not a process. You either have a living room with a curled up dimension or you do not. There is no "above 1mm" if the height...
Post by: mfb, Feb 21, 2018 at 7:39 PM in forum: General Math
10. Post

### B Compactified/Curling 1D = 2D?

This is not a process. A dimension is either curled up or not. Multiple turns are not a meaningful concept. See the surface of Earth as analog...
Post by: mfb, Feb 21, 2018 at 7:20 PM in forum: General Math