How much heat must be added to a 250g aluminum pan to raise its temperature from 20°C to 85°C? The specific heat of aluminum is 897 J/kg·K

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?

To do work, this truck uses energy stored in chemical fuel and an electrical battery. how much total energy does this truck put out?

Which word expression describes how much to calculate pressure