Una persona tira de una cuerda unida a un cajon para arrastrarlo por el piso. La cuerda forma un angulo de 30° con el piso y la fuerza es de120N. Hallar las componentes de la fuerza.

Consider a system to be two train cars traveling toward each other. what is the total momentum of the system before the train cars collide?   kg • what must the total momentum of the system be after the train cars collide?   kg •  

A0.750 kg aluminum pan is removed from the stove and plunged into a sink filled with 10.0 kg of water at 293 k. the water temperature quickly rises to 297 k. what was the initial temperature of the aluminum pan? the specific heat of aluminum is ca = 900 j/(kgk) and water is cw = 4190 j/(kgk)

The energy released by a nuclear fusion reaction is produced when