Select the correct answer. a ball rolls from point a to point b. the total energy of the ball at point a isn’t the same as the sum of its potential energy and kinetic energy at point b. which statement best explains this situation? a. the rolling ball doesn’t follow the law of conservation of energy. b. some of the ball’s energy is transformed to thermal energy. c. the rolling ball loses some of its energy because of gravity. d. the ball absorbs some of its own potential energy.

The coulomb's law explains which of the following? select all the force between two charged objects is inversely proportional to the charge on each object. the force between two charged objects is directly proportional to the charge on each object. the force between two charged objects is directly proportional to the distance separating them. the force between two charged objects is inversely proportional to the square of the distance separat coulomb's law is similar to newton's 2nd law. if the force between two objects is f and the charge on both objects is doubled, the new force between the would now be 2f. if the force between two objects is 2f and the distance separating them is doubled, the new force between the objects would now o the be zf.

Acar drives toward the right over the top of a hill, as shown below. which arrow represents the centripetal acceleration? w x y z

The uniform slender bar rests on a smooth horizon- tal surface when a force f is applied normal to the bar at point a. point a is observed to have an initial acceleration aa of 20 m/s2, and the bar has a corre- sponding angular acceleration of 18 rad /s2. deter- mine the distance b.