Asurface receiving sound is moved from its original position to a position three times farther away from the source of the sound. the intensity of the received sound thus becomes
a. three times as low.
b. three times as high.
c. nine times as low.
d. nine times as high.

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