Ms. Soloway wanted to know about students’ enrichment preferences at Leadership Prep Ocean Hill. Ms. Soloway randomly sampled LPOH students by asking every 5th student at arrival what their favorite enrichment was. The results of Ms. Soloway’s survey are shown in the table below: Out of 500 total LPOH students, about how many would you expect to prefer music? Explain how you used the information in the survey to make the prediction.

Acoal-fired plant generates 600 mw of electric power. the plant uses 4.8 x 10^6 kg of coal each day, and the heat of combustion of coal is 3.3x 10^7 j/kg. the steam that drives the turbines is at a temperature of 300° c, and the exhaust water is at 37° c. (a) what is the overall efficiency of the plant for generating electric power? (b) how much thermal energy is exhausted each day? (c) what is the change in entropy of the universe for this heat engine? (d) using the same heat reservoirs, what is the maximum possible (carnot) efficiency for a heat engine?

The speed of light in a material is 0.50 c. what is the critical angle of a light ray at the interface between the material and a vacuum?

Idon’t quite understand this problem