PLEASE HELP ME ILL MARK BRAINIEST IF YOU DO THIS RIGHT!!!

When you push downward on a book at rest on a table, you feel an upward force. does this force depend on friction? defend your answer.

Ways that industry and agriculture use physical properties to separate substances

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