un rayo se produce a 30 km de un observador ¿qué recibe este primero la luz o el sonido de un rayo? tizón = 300000 km / s; sonido = 340 m / s

Two steel balls, each of mass m, are welded to a light rod of length l and negligible mass and are initially at rest on a smooth horizontal surface. a horizontal force of magnitude f is suddenly applied to the rod as shown. determine (a) the instantaneous acceleration a of the mass center g and (b) the corresponding rate at which the angular velocity of the assembly about g is changing with time.