This multiple exposure photograph shows the apparent retrograde motion of mars. to make this picture, the photographer needed to combine individual photos of mars taken over a period of: view available hint(s) this multiple exposure photograph shows the apparent retrograde motion of mars. to make this picture, the photographer needed to combine individual photos of mars taken over a period of: about 3 nights. one full night. several months. about one hour.

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?