A tennis player tosses a tennis ball straight up and then catches it after 2.00 s at the same height as the point of release. (a) What is the acceleration of the ball while it is in flight? (b) What is the velocity of the ball when it reaches its maximum height? Find (c) the initial velocity of the ball and (d) the maximum height it reaches.
Chapter 6: Physical Properties of Sound 6.1 General Remarks About Wave Propagation 1. The properties of waves that we will consider in this chapter are not features of sound waves alone. 2. For it to be possible for us to see light or to hear sound, these waves must hit the organs which are responsible for our particular sensations. 3. For sound to travel, it needs a medium. 6.2 Law of Reflection 1. Sound waves practically never travel in an infinite medium. 2. Sound is reflected; it reflects from any surface or any obstacle. a. If the surface is smooth and hard, as, for instance walls in a marble