Auniform flat disk of mass m and radius r rotates about a horizontal axis through its center with angular speed.
(a) what is its angular momentum?
(b) a chip of mass m breaks off the edge of the disk at an instant such that the chip rises vertically above the point at which it broke off (fig. 10-29). how high above the point does it rise before starting to fall?
(c) what is the final angular speed of the broken disk?

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