What is the ratio of the gravitational pull of the sun on the moon to that of the earth on the moon? (assume the distance of the moon from the sun can be approximated by the distance of the earth from the

1. do the particles in the medium material move in the same direction of the wave or at opposite direction to the wave? explain your answer. 2. by inputting more energy into the wave, i. e a large shake of the spring, which wave property also increases? 3. are there forces of friction acting while a wave is passing through a medium?