A 2.1 kg sample of water at 35 degrees Celsius is poured into a lake. The temperature of the lake water is 10 degrees Celsius, and it remains essentially constant as the 2.1 kg sample cools down within it. What is the entropy change of the lake water? Let the specific heat capacity of water = 4190 J/(kg*K)

The us government wants to allocate billions of dollars in the next 10 years to assure our future energy security. the funds will be spread among a variety of possible energy resources. where do you think the government should put the greatest support: solar energy, wind energy, clean coal, oil exploration, gas exploration, or a combination of sources? are there other efforts that should be explored? support your position with cited information for both questions.

Gasoline comes from petroleum, which is made from ancient living things. petroleum, therefore, contains a type of energy. a. heat b. nuclear c. biological d. chemical potential

If an athlete runs once around a track, back to the starting line, her average velocity is zero. true or false?