A is very general in nature, while a specifies what we want to study more specifically, suggesting the key concepts we need to know Group of answer choices research topic; research question (hypothesis) non-systematic idea; systematic idea systematic idea; non-systematic idea research question (hypothesis); research topic

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?

How many dots must be added to the symbol to properly represent a standard nitrogen ion? a) 1 b) 3 c) 5 d) 8

Which is not one of the major climate zones? question 3 options: rain forest polar tropical temperate