1 Suppose you throw someone a ball, thereby transporting kinetic energy. Could you consider the motion of the ball to be a mechanical wave pulse? 2

1 Suppose you throw someone a ball, thereby transporting kinetic energy. Could you consider the motion of the ball to be a mechanical wave pulse?2 Which quantities determine the speed of a particle in a medium through which a wave propagates: (a) wave speed; (b) wavelength and frequency; (c) amplitude and frequency; (d) wave speed and period?3 Would it be possible to detect on earth sounds produced on another planet if you had a detector sensitive enough to very low-intensity sounds?4 Suppose you were standing on the moon as a nearby lunar landing module approached the surface, firing its engines to slow its descent. Could you hear the engine?5 When cars begin to move in a long line of stalled traffic, the motion passes through the line as a wave pulse.(a) What is the direction of motion of the pulse relative to the motion of the cars?(b) Is the wave speed affected by the drivers’ reaction times?6 Creating a “wave” is a popular pastime at football games and other sporting events. The wave begins when every - one in one section of the stadium quickly stands up and then sits down. Then people sitting in an adjacent section, say, to the right, respond with the same motion but delayed a bit. Next the section to their right follows.The result is a wave pulse through the spectators. Does human reaction time affect the wave’s (a) amplitude; (b) period; (c) wave speed; (d) wavelength?7 When lightning strikes at some distance, will you see the lightning first or hear the accompanying thunder first?Explain.8 Suppose you are in a rowboat on a quiet lake as a fast motorboat passes at a considerable distance. The motorboat produces waves, which are a superposition of harmonic waves of various wavelengths. Do the waves of longer or shorter wavelengths reach you first?