D= m/v [stack friction] , where d = density, m = mass, and v = volume. if a rock has a density of 10 g/cm3 and a volume of 15 cm3 , what is its mass?

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