Se lanza una piedra hacia abajo con una rapidez inicial de 8.0 m/s desde una altura de 25 m. Calcula a)la velocidad con la que golpea el suelo y b) el tiempo que tarda en llegar al suelo.

The system is released from rest with the cable taut, and the homogeneous cylinder does not slip on the rough incline. determine the angular acceleration of the cylinder and the minimum coeffi cient s of friction for which the cylinder will not slip.

Uppose we consider the system of the three capacitors as a single "equivalent" capacitor. given the charges of the three individual capacitors calculated in the previous part, find the total charge qtot for this equivalent capacitor. express your answer in terms of v and c.

Where do magnetic lines of force enter earth?