7.- Se lanza desde la base de un plano inclinado de 30º un bloque de 1 Kg con una velocidad inicial de 20 m/s. El coeficiente de rozamiento es 0,2. Calcula: a) La aceleración del bloque. (Sol: a = -6,6 m/s2)
b) El espacio recorrido. (Sol: xf -x0 = 30,03 m)

The space within which a test north pole experiences a force magnetic poles 2. a powerful stream of electrons flowing high above the earth in the ionosphere electrojet 3. a concept to explain the directional nature of a magnetic field field lines 4. coil of wire designed to produce a magnetic field by a current passing through its windings ionosphere 5. that region above the earth's atmosphere where particles exist in an ionized state magnetic field 6. the extremities of a magnet where the field lines tend to converge or concentrate aurora borealis 7. a phenomenon that occurs in the northern latitudes; the northern lights solenoid