# Recent Content by mfb

1. Post

### I Body rotating about its center of mass

This is an arbitrary point of view. You can also let it rotate around any other point. If you do that its translation velocity will change over...
Post by: mfb, Dec 18, 2018 at 8:46 AM in forum: Classical Physics
2. Post

### I Why there is a general lack of neutrons in the Earth?

Carbon, oxygen, silicon and sulfur are produced from the fusion of several alpha particles, they start with an equal number of protons and...
Post by: mfb, Dec 18, 2018 at 7:21 AM in forum: High Energy, Nuclear, Particle Physics
3. Post

### B Is radioactive decay truly random?

There are deterministic interpretations of quantum mechanics, where the underlying physics is not random. But even there you cannot make...
Post by: mfb, Dec 18, 2018 at 5:42 AM in forum: General Physics
4. Post

### Challenge Math Challenge - December 2018

There is an interesting pattern in problem 18:[spoiler]
Post by: mfb, Dec 18, 2018 at 4:18 AM in forum: General Math
5. Post

### Electrical UHF/SHF Electromagnet

Okay, so you need an electromagnet that can have a magnetic field up to 10 mT. Easy so far. What is the AC frequency you are looking at? Lower...
Post by: mfb, Dec 18, 2018 at 12:29 AM in forum: DIY Projects
6. Post

### A Influence on Neutron spectrum due to energy loss of beam

You are almost there. You know the neutron energy from a 100 MeV proton (assuming you followed the previous hints). What will the neutron energy...
Post by: mfb, Dec 17, 2018 at 10:20 PM in forum: High Energy, Nuclear, Particle Physics
7. Post

### B Fusion of Hydrogen Isotopes

These are numbers you can easily look up. DT wins by a big margin.
Post by: mfb, Dec 17, 2018 at 8:34 AM in forum: High Energy, Nuclear, Particle Physics
8. Post

### Electrical UHF/SHF Electromagnet

An electromagnet is a magnet that can be controlled with current in a coil. It doesn't have a wavelength. An electromagnetic wave has a...
Post by: mfb, Dec 17, 2018 at 7:49 AM in forum: DIY Projects