Light travels from water (n=1.33) into an unknown medium. If the angles of incidence and refraction are 40 degrees and 25 degrees respectively. What is the index of refraction of the unknown medium?

Which simple machine is not part of this compound machine? a. lever b. pulley c. inclined plane d. wheel and axle

An object's buoyant force and weight mean the same thing.a. trueb. false

According to an observer on earth, planet x is stationary. maria and samir depart earth on their spaceships at the same time, each flying at 0.5c. maria flies toward planet x and samir flies in the opposite direction. according to maria, her voyage to planet x takes 9 years. how many years does maria's voyage take according to samir?