What is the ultraviolet catastrophe?

Aknife blade is a(n) a. lever b. screw c. wedge d. inclined plane

The diagram shows a series of volcanic island and a hot spot determine the direction of movement of the tectonic plate that for the island

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.