Read each description and classify each as an elastic collision or inelastic collision a. Football player catches a football
b. A billiard ball colliding with another billiard ball
c. A train crashing into a plan

Asun-sized star will spend most of its lifetime as a: white dwarf red giant protostar main-sequence star

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.

An athlete is holding 24 lb of weights at a height of 6 inches above the stack as shown. to lower the weights, she applies a constant force of 5 lb to the handle. determine the velocity of the weights immediately before they hit the stack.