A golfer drives her golf ball from the tee down the fairway in a high arcing shot. When the ball is at the highest point of its flight:

Afisherman notices that his boat is moving up and down periodically without any horizontal motion, owing to waves on the surface of the water. it takes a time of 2.20 s for the boat to travel from its highest point to its lowest, a total distance of 0.670 m . the fisherman sees that the wave crests are spaced a horizontal distance of 5.80 m apart. (a) how much is the wavelength? (b) find the period of the wave. (c) how fast are the waves traveling? (d) what is the amplitude a of each wave?

At what time will the interfering waves have an amplitudeof zero?

Could we see a galaxy that is 20 billion light-years away?