Light is incident on the left face of an isosceles prism; with an apex angle of 49o, such that the light exiting the right face is parallel to its surface.
what is the index of refraction of the prism, if the angle of incidence on the left face side is 19o to the normal of the face? light is incident towards the apex.

Consider an ordinary, helium-filled party balloon with a volume of 2.2 ft3. the lifting force on the balloon due to the outside air is the net resultant of the pressure distribution exerted on the exterior surface of the balloon. using this fact, we can derive archimedes’ principle, namely that the upward force on the balloon is equal to the weight of the air displaced by the balloon. assuming that the balloon is at sea level, where the air density is 0.002377 slug/ft3, calculate the maximum weight that can be lifted by the balloon. note: the molecular weight of air is 28.8 and that of helium is 4.

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

When a light bulb shines, it gives off light energy and energy. a. heat b. potential c. chemical d. electrical