The critical angle at the boundary between a ruby and the air is 34.6º. Use this to calculate the refractive index of this ruby. Give your answer to

two decimal places.

An object having a mass of 2.0 kilograms falls from a height of 15 meters. What is its kinetic energy when it hits the ground?

Which path would light follow as it travels through glass?

What quantity is represented by a unit called newton (N) ?

Two simple pendulum of slightly different length, are set off oscillating in step is a time of 20s has elasped, during which time the longer pendulum has completed exactly 10 oscillations. Find the length of each pendulum.

What's a similar project to the soda and mentos project?

Some wave characteristics depend upon how the wave is produced. other wave characteristics depend upon the properties of the medium.

What is the mass of oxygen in an oxygen tank at 20 C if the tank has a volume of 0.20 m3 and the oxygen pressure in the tank is 4.0 105 N/m2 (mass of one mole of one mole of oxygen is 16 g and the universal gas constant is 8.

Normal conversation in an office produces a decibel rating of 50 db. how many identical voices could you add without exceeding a sound intensity of 100 db?

As the army approached the bridge into the city, the commander told them to break step. He did not want the soldiers to march in cadence.

Plaskett's binary system consists of two stars that revolve in a circular orbit about a center of mass midway between them. This statement implies that the masses of the two stars are equal (see figure below).