How many atoms are in a sample of 2.39 moles of neon (ne) atoms?
6.02 × 1023 atoms ne
1.44 × 1024 atoms ne
3.97 × 10-24 atoms ne
2.52 × 1023 atoms ne

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

An electron and a proton have the same kinetic energy upon entering a region of constant magnetic field and their velocity vectors are perpendicular to the magnetic field. suppose the magnetic field is strong enough to allow the particles to circle in the field. note: you'll need to look up the masses for an electron and proton. 1) what is the ratio of the radii of their circular paths rp/re?

If steel is more dense that lake water, why can a boat float