Aspherical ball is immersed in water contained in a vertical cylinder. the rise in water level is measured in order to calculate the radius of the ball. calculate the radius of the ball in the following cases:
(a): cylinder of radius 10cm, water level rises 4cm.
(b): cylinder of radius 100cm, water level rises 8cm

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