What is the resultant sound level when an 81-db sound and an 87-db sound are heard simultaneously ?.

The four giant gas points that are made primarily of lightweight elements are

Ais useful when you need a simple machine to you separate two things. a. lever b. screw c. pulley d. wedge

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