What is avarage speed? (AS)
speed?

What if? physicists often measure the momentum of subatomic particles moving near the speed of light in units of mev/c, where c is the speed of light, and 1 mev = 1.6 ✕ 10−13 kg · m2/s2. based on this, what are the units of momentum for a high-speed subatomic particle in terms of fundamental si units?

An observer that stands still as the electron moves by him, will observe

When the magnetic domains in a material can be aligned, but eventually drift out of alignment, the material is