If everything with mass is attracted to every other thing with mass, why doesn’t all the matter in the universe pull together in a giant ball of stuff?

An equinox occurs when a. neither end of earth's axis is tilted toward or away from the sun. b. the north end of earth's axis is tilted away from the sun. c. the north end of earth's axis is tilted toward the sun. d. earth's axis is parallel to the sun's rays. select the best answer from the choices provided a b c d

Which of the following are considered noble gases? a. bromine b. neon c. argon d. chlorine

Find the magnetic field a distance r from the center of a long wire that has radius a and carries a uniform current per unit area j in the positive z direction.