John's knee was injured at basketball practice last month. Ever since then, it has hurt John to run, so he has not been physically active. What should John do so that he can be physically active again?

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?

Describe different biomes. what are some adaptations that organisms (plants or animals) must have to live in each biome?

The two required components for a generator are