Suppose a person sits on a skateboard with her feet up and throws a ball. explain why she will move as a result of throwing the ball.

Ball b is hanging from an inextensible cord. an identical ball a is released from rest when it is just touching the cord and drops through the vertical distance h a 5 8 in. before striking ball b. assuming e 5 0.9 and no friction, determine the resulting maximum vertical displacement h b of the ball b

Which is the correct symbol for an isotope of iodine with 53 protons and 78 neutrons?

The energy released by a nuclear fusion reaction is produced when