If a bird flew 200m due east then turned and flew 400m due north, then turned and flew 400m due west and turned again and flew 600 m due south, what is the displacement covered by the bird?

When the velocity of an object is doubled, by what factor is its momentum changed? by what factor is its kinetic energy changed? a) the momentum is zero. b) the momentum is not zero. c) difficult to say.

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

Which type of wave can travel without a medium