10. how is the mass number calculated for an element? a. the difference between the mass and the protons b. the sum of protons and neutrons c. the product of neutrons and protons d. there is no calculation.

Which property of fossils allow scientists to determine the relative rock ages..

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?

Astate of matter all that has define volume and can flow is a(n)