If the tennis player serves the ball horizontally (q = 0), calculate its velocity v if the center of the ball clears the 36-in. net by 4 in. also find the distance s from the net to the point where the ball hits the court surface. neglect air resistance and the effect of ball spin.

Ascientist notices that an oil slick floating on water when viewed from above has many different colors reflecting off the surface, making it look rainbow-like (an effect known as iridescence). she aims a spectrometer at a particular spot and measures the wavelength to be 750 nm (in air). the index of refraction of water is 1.3