Which statement best describes scientific theories?

scientific theories are what laws are called before they are proven.

scientific theories attempt to explain why natural events occur .

scientific theories are based on opinions.

scientific theories describe natural events.

Atwo-stage air compressor operates at steady state, compression 10m^3/min of air from 100 kpa and 300k to 1200 kpa. an intercooler between the two stages cools the air to 300k at a constant pressure of 350 kpa. the compression processes are isentropic. a) calculate the power required to run the compressor, in kw b) compare the result to the power required for isentropic compression from the same inlet state to the same final pressure.

In the first law of thermodynamics, triangle e=q-w, what does q stand for

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