The thesis is wrong. The orbit of the space station will always around the core of the Earth but not neccesarily around the equator. You will see the space station always above you if it has the same angular velocity as the Earth. For example telecommunication satellites work like this. They are...
Large metal atoms radioactively decay by alfa, beta and gama radiation into smaller atoms. If you get from you teacher some radioactive metal (it must have very low acitivity so that it doesn't kill you) and you can detect gama particles using Geiger counter (GM counter) and LabPro program. You...
Due to rules of equlibirum in the universe it would be logical to suspect that after Big Bang there was 50% of matter and 50% of antimatter. If that were true, the matter and antimatter would anihilate with each other and turn into energy. However, obsevration of the universe shows that 1/10.000...
Anwser to the first question:
You must know that even though alfa particle has no electrons, it has 2 protons, because alfa particle is constituted from 2 neutrons and 2 elektrons, having mass of 4 and charge of 2+. Therefore in the equation you have on the LHS 92 , on the RHS you have 90 + 2...
If the diameter is the same, then the density must be roughtly the same as well. The difference between composition of neutron and proton is that neutron is made up of 2 down quarks and 1 up quark while proton is made up of 2 up quarks and 1 down quark. I am not sure of the density of the up and...