In a 6 m bar thats used as kever a fulcrum is placed at 2 m of the distance from the right end, as shown in the figure

State one advantage and one disadvantage of using a plane mirrior as a driving mirrior

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.

What is the major limitation to the light microscope?