How much momentum does a 77 kg football player have if he is running with a speed of 4 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.

Use 4 to 5 complete sentences, explain the concepts of beats and how beats are produces.

The smallest particle of an element that retains its identity in a chemical reaction. true or false