Una caja de 4kg que se desplaza hacia la derecha a 7m/s choca contra otra de 3Kg que se mueve en sentido contrario, a 3,6m/ s. Después del impacto, ambas cajas se mantienen unidas ¿con que velocidad avanza.?

Name three different units of energy used to measure heat and describe what type of situations each is usually used.

Because air contracts as it cools, the air pressure inside a freezer is typically lower than on the outside. why do ice cubes inside a freezer tend to shrink over time? a. the ice dissolves oxygen from the air, forming a denser crystalline matrix. b. the ice reacts chemically with carbon dioxide in the air, forming gaseous carbon compounds. c. the ice melts, and then the liquid freezes as ice crystals on the bottom of the freezer. d. the ice sublimes, and then the water vapor deposits as ice crystals on the sides of the freezer.

Give an example of a collision in real life. use the law of conservation of energy to describe the transfer of momentum. be sure and discuss the momentum before and after the collision occurs. you will need at least 3 sentences to thoroughly answer this question.