What is conserved in physical changes?
shape
entergy
mass
density

Which of these statements is true? a. quarks pair with leptons to form protons and neutrons. b. quarks pair with bosons to form photons. c. quarks pair with photons to form protons and neutrons. d. quarks pair with other quarks to form protons and neutrons. e. quarks pair with electrons to form protons.

Use the right-hand rule for magnetic force to determine the charge on the moving particle. this is a charge.

Which of the following is not a transverse wave? a) soundb) lightc) radiod) all of thesee) none of these