The atomic number of magnesium is 12. this means that its nucleus must contain a) 6 protons and 6 neutrons. b) 6 neutrons and 6 electrons. c) 12 neutrons and no protons. d) 12 protons and no electrons.

State the right hand rule of the direction of magnetic field in a conductor carrying current

Alfred pushes on a heavy box, but cannot move it. the box has a lot of inertia motion friction gravity

Mutt and jeff are running along a path each pushing a cart loaded with rocks. if mutt's wagon has a mass two times greater than jeff's and they want to stay together, arriving at their destination at the same time, what must happen? a) jeff should slow down so mutt can catch up. b) mutt must use half as much force to push his cart. c) mutt must use twice as much force to push his cart. d) mutt and jeff will use the same force, but mutt will take bigger steps.