aligass2004 said:Grrrr...I thought I did. I did kinda. I did I = 1/2 (1.2) (.18^2)...instead of (.018). I got it.
Angular momentum of a rotating disk is a measure of the rotational motion of the disk around its axis. It is a vector quantity that depends on the mass, velocity, and distance from the axis of rotation of the disk.
Angular momentum is directly proportional to the rotational inertia of a rotating disk. This means that as the rotational inertia increases, the angular momentum also increases, and vice versa.
According to the law of conservation of angular momentum, the angular momentum of a rotating disk remains constant as long as there are no external torques acting on it. Therefore, if the rotational speed increases, the radius of the disk must decrease, and vice versa, in order to maintain a constant angular momentum.
The mass distribution of a rotating disk affects its angular momentum by changing its rotational inertia. A disk with a more spread out mass distribution will have a higher rotational inertia and therefore a higher angular momentum compared to a disk with a more concentrated mass distribution.
Yes, the angular momentum of a rotating disk can be changed by applying external torques to the disk. These torques can come from various sources, such as friction, gravity, or an external force. By changing the external torque, the angular momentum of the disk can be increased, decreased, or even reversed.