What are the scientific principles of physical science

The softest and hardest minerals are: softest hardest

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.

Abar magnet cut in half will form a total ofpoles.a)fourb)eightc)two