In the universal law of gravitation, F= Gmm, what does the symbol m stand r? for?

What characteristics of hv2112 make it the best candidate to be classified as a thorne-zytkow object?

Which best describes the weak nuclear force? it maintains attraction between the m ecules in liquids. it attracts the nucleus of one atom to the nucleus of another atom. it pulls all matter in the universe together it keeps particles that make up protons and neutrons together

What is the momentum of a 47-gram tennis ball that is traveling at 40 m/s