Apoint source of light is 1.24 m below the surface of a pool. what is the diameter of the circle of light that a person above the water will see? assume the water has an index of refraction of =1.33.

The earth is constantly spinning on its axis, like you might spin a basketball on your finger. it is this spinning of the earth that causes

Diego is trying to lift a piano to the second floor of his house. diego uses a pulley system and gives a big lift to the piano. the piano moves upward, then stops, and then it starts to fall to the ground. which list best describes the forces on the piano in the proper order? a.positive force, balanced force, negative force b.negative force, balanced force, positive force c.positive force, unbalanced force, negative force d. negative force, unbalanced force, positive force

List and describe three ways that humans can change ecosystems and three ways that humans can protect ecosystems.