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.

Which of the following scientists physics in Egypt

As more lamps are put into a series circuit, the overall current in the power sourceA) increases. B) decreases. C) stays the same.

What is characteristic of both sound waves and electromagnetic waves? (1) They require a medium. (2) They transfer energy. (3) They are mechanical waves. (4) They are longitudinal waves.

Explain why black asphalt parking lot feels hotter to your bare feet than concrete sidewalk does, and describe how the heat is transferred to your feet. This is for earth science.

Which electron transition would result in the greatest amount of energy to be absorbed? a) n = 4 to n = 1 b) n = 1 to n = 4 c) n = 2 to n = 1 d) n = 1 to n = 3 e) None of the choices are correct

Total energy input is 1400 and my efficiency is 80% so what is the useful energy output in jules?

What is the force of gravity acting on a 2000-kg spacecraft when it orbits two Earth radii from the Earth's center (that is a distance r=6380 km above the Earth's Surface. The mass of the Earth is 5.98 x 1024 kg.

An LC circuit has a 6.00 mH inductor. The current has its maximum value of 0.570 A at t = 0s. A short time later the capacitor reaches its maximum potential difference of 66.0 V. What is the value of the capacitance?

The first law of thermodynamics states that ΔE = Q - W. Is this also a statement of the principle of conservation of energy? Yes, the heat added and the change in internal energy of the gas equal the work done by the piston.

How can we calculate the density of a sustance that has irregular volume