Why does the weight of a body differ on different celestial bodies of the universe?​

The law of the conservation of momentum says that the total momentum of any closed and isolated system cannot

Which statement best describes the superposition principle? a.) if two in-phase waves arrive simultaneously at a point, their amplitudes add up b.) if two out-of-phase waves arrive simultaneously at a point, their amplitudes add up c.) if two in-phase waves arrive at a point one after another, their amplitudes add up d.) if two out-of-phase waves arrive at a point one after another, their amplitudes adds up

The strong nuclear force acts over a small distance than the electrostatic force. true or false