In the rotating earth/moon system, centrifugal force is equal to the gravitational force, but operates in the opposite direction. true or false?

Explanation:

The gravitational force between the earth and the moon is acting towards the earth and the centrifugal force is acting away from the centrifugal force, so they counterbalance each other.

Yes, it is true.

when the velocity of a mass on a spring is zero, the acceleration is at a maximum .

convex lenses are thicker at the middle. rays of light that pass through the lens are brought closer together (they converge). a convex lens is a converging lens. when parallel rays of light pass through a convex lens the refracted rays converge at one point called the principal focus.