Bob is studying waves in science and learns that the energy of a wave is directly proportional to the square of the waves amplitude. if the amplitude of a wave changes from 2m to 1m, what should he predict as the effect on energy of the wave? a) the energy is halved. b) the energy is doubled. c) the energy is quartered. d) the energy is quadrupled.

What must be the same for any two resistors that are connected in series ? a. the potntial diffrence across each b. the rate at which charge moves through each c. the rate at which energy is used by each d. the resistance to the flow of charge of each

Which explanation describes the forces involved for a person to walk down the sidewalk? a. the person's feet push backward on the sidewalk; the sidewalk pushes backward on the person. b. the person's feet push forward on the sidewalk; the sidewalk does not push on the person. c. the person's feet push backward on the sidewalk; the sidewalk pushes forward on the person. d. the person's feet push forward on the sidewalk; the sidewalk pushes forward on the person.

How do the forces acting on a boat compare to the force acting on a plane ?