Acircular space station has a diameter of 1,700 meter. the station rotates to simulate artificial gravity on the inside. what must the period be of the space station in order to simulate earths gravity?

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