A muon (mass 106 MeV/c2) is produced in the upper atmosphere with an energy of 20000 MeV (20 GeV). In its rest frame, the muon decays 2.2 microseconds after it is produced. How far does the muon travel in the rest frame of the earth

20) what is a magnetic field? 21) in which direction do magnetic field lines always point? 22) sketch a diagram showing how a plotting compass points around a 23) name two magnetic poles that will: a) attract each other b) repel each other. 24) explain why you can use a compass to navigate. 25) what's an electromagnet? 26) list two ways to increase the strength of an electromagnet. 27) the wire in a simple motor feels a force when a current flows through it. why is this? i need answers to check mine