I NEED HELP PLEASE
How do the structures of galaxies give evidence of gravity?

Which force is most responsible for binding together an atom's protons and neutrons? electrostatic gravitational nuclear magnetic

The a metal retainer that keeps the rolling elements evenly spaced. n a. seal n b. separator n c. bearing n d outer race

Which statement correctly describes a step-up transformer? a. it increases the amount of electric energy available. b. it increases the voltage of an electric current. c. it changes direct current into alternating current. d. it has more loops of wire in its primary coil.