(Nelson Problem 1.9, p 33) Surf's up. (a) Find an approximate formula for the speed of a wave on the surface of the ocean. Don't work hard; don't write or solve any equation of motion. Your answer may involve the mass density of water, the wavelength of the wave, and/or the acceleration of gravity. [Hint: The depth of the ocean doesn't enter the problem (it's effectively infinity), nor does the surface tension of the water (it's effectively zero).] (b) Evaluate your formula for wavelength 1 m to see whether your result is reasonable. please explain and show all the necessary steps.