La afirmación “los electrones se mueven siempre en la misma dirección”, corresponde a corriente Seleccione una:
a. Alterna
b. Coulomb
c. Continua
d. Constante

Awater-filled u-tube manometer is used to measure the pressure inside a tank that contains air. the water level in the u-tube on the side that connects to the tank is 5 ft above the base of the tank. the water level in the other side of the u-tube (which is open to the atmosphere) is 2 ft above the base. determine the pressure within the tank.

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 •  

The voltage applied across a given parallel-plate capacitor is doubled. how is the energy stored in the capacitor affected?