A person is sitting on a sled at the top of a snow covered hill and a second person has just started pushing them to get them going down the hill. Which
statement is correct

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?

Which branches of natural science include the study of an organism that lived 10 million years ago

When the magnetic domains in a material can be aligned, but eventually drift out of alignment, the material is