Which of the following is the best example of kinetic energy being transformed into potential energy? A. water flowing into lake behind a dam
B. an avalanche sliding down a mountainside
C. wind pushing a sailboat through the water
D. a motorboat pulling a water skier across a lake
WHICH ONE IS IT?!

How does kepler second law of planetary motion overthrow one of the basic beliefs of classical astronomy

In vapor-liquid equilibrium in a binary mixture, both components are generally present in both phases. how many degrees of freedom are there for such a system? the reaction between nitrogen and hydrogen to form ammonia occurs in the gas phase. how many degrees of freedom are there for this system? steam and coal react at high temperatures to form hydrogen, carbon monoxide, carbon dioxide, and methane. the following reactions have been suggested as being involved in the chemical transformation:

With the largest atoms and the smallest number of valence electrons and with the smallest atoms and the greatest number of valence electrons are the most reactive. a. nonmetals; metals b. nonmetals; transition elements c. transition elements; metals d. metals; nonmetals