We know that the index of refraction of materials can help identify those materials. When a light beam is shined onto a surface with an angle of incidence of 65.3°, the reflected ray is found to be completely polarized. (a) What is the index of refraction of the reflecting material?

You throw a small rock straight up from the edge of a highway bridge that crosses a river. the rock passes you on its way down, 7.00 s after it was thrown. what is the speed of the rock just before it reaches the water 28.0 m below the point where the rock left your hand? ignore air resistance.

Ablock of mass m slides on a horizontal frictionless table with an initial speed v0 . it then compresses a spring of force constant k and is brought to rest. the acceleration of gravity is 9.8 m/s2 . how much is the spring compressed x from its natural length?

You have 80 g of 60oc water and 80 g or 10oc water. what is the final temperature when the two are mixed? explain.