Una mujer de 70 kg se balancea sobre uno de los tacones de sus zapatos. Si el tacón es circular con un radio de 0.4cm, ¿qué presión ejerce ella sobre el suelo?

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.