What is the fossil record? a. The list of the all fossils that exist.
b. The history of a single fossil species.
c. The history of life on earth as recorded on fossil.
d. The geologic history of Earth up to the appearance of life.

The energy released by a nuclear fusion reaction is produced when

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.

A2.50 × 105 w motor is used for 26.4 s to pull a boat straight toward shore. how far does the boat move toward shore if a force of 4.20 × 104 n is applied by the motor?