En una clase el profesor pregunta:
¿Qué tipo de sistema es una caja de leche chocolatada sin abrir?
Ana considera que es un sistema aislado y en cambio Martina opina que es un sistema cerrado.
¿Cuál de las dos tiene razón y porqué?
¿Y después de tomarla?

Aforce of 100 newtons is used to move an object a distance of 15 meters with a power of 50 watts. find the work dine and the time it takes to do the work

What is the increase in density of a medium due to wave travel?

On a mild saturday morning while people are working inside, the furnace keeps the temperature inside the building at 23degreesc. at noon the furnace is turned off, and the people go home. the temperature outside is a constant 16degreesc for the rest of the afternoon. if the time constant for the building is 3 hr, when will the temperature inside the building reach 18degreesc? if some windows are left open and the time constant drops to 2 hr, when will the temperature inside reach 18degreesc?