se define como el movimiento o intercambio de energía entre cuerpos, mientras que es la medida de la agitación de las moléculas de un cuerpo. * 1-el calor, la temperatura
2-la energía , la temperatura
3-la energía, la potencia
4-el calor, la energía

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Students design a model roller-coaster track. they place a rubber ball at the highest point on the track and let it go. the ball rolls along the track pulled only by the force of gravity. eventually, it comes to a stop. which change to the design will result in the ball moving the greatest distance?

Air is contained in a variable-load piston-cylinder device equipped with a paddle wheel. initially, air is at 400 kpa and 17°c. the paddle wheel is now turned by an external electric motor until 75 kj/kg of work has been transferred to air. during this process, heat is transferred to maintain a constant air temperature while allowing the gas volume to triple. calculate the required amount of heat transfer in kj/kg.