12. Observa la gráfica siguiente, correspondiente a una determinada sustancia: a. ¿Se trata de una gráfica de calentamiento o de enfriamiento? ¿Por qué?
b. ¿Qué cambios de estado tienen lugar?
c. ¿Cuánto valen los puntos de fusión y ebullición de la sustancia?

You notice a very one-dimensional-thinking snail crawling along one rail of a railroad track. naturally, you remove it to a safer place. but before you do, you observe it as it moves from position xi = -92.9 cm to position xf = -64.9 cm along the rail, as measured from a point where one rail abuts the next. what is the snail\'s displacement δx in centimeters?

Look at the potential energy diagram for a chemical reaction. which statement correctly describes the energy changes that occur in the forward reaction?

Ryan is examining the energy of the particles in a bar of gold. what is ryan most likely studying?