When a woman stands with two feet on a scale, the scale reads 280 n. when she lifts one foot, the scale reads a. less than 280 n. b. more than 280 n. c. 280 n.

Avolcano erupts next to a grassland area in a valley. a. describe three ways in which material released by the volcano could impact the grassland area. b. describe three ways in which the grassland ecosystem could recover after a volcanic eruption.

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.

The direction of the current in an alternating current circuit remains constant. is direct. changes repeatedly. changes randomly.