3. An astronomer would use light years to express the size of A. The Sun B. The Universe C. The Solar System 0:04 D. The Earth​

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 diagram shows a series of volcanic island and a hot spot determine the direction of movement of the tectonic plate that for the island

In science and physics what is the standard unit of measure for speed?