What must be the initial angular speed, of the top disk be so that when it is dropped onto the bottom disk the final angular speed of the disks is equal in magnitude to the initial angular speed of the lower disk ω1 but opposite in direction? Note: the moment of inertia of a disk of mass M and radius R about an axis through its center and perpendicular to the disk is = 1 2 R 2

We have a colorless transparent liquid. it looks like water. we seperated it into a solid and a liquid by evaporration and condention was this a chemichal or a physical seperation a. chemical seperation b. physical seperation

One form of energy can be another type of energy. a. created to form b. transformed into c. destroyed and then created to form

The period of a pendulum varies directly as the square root of the length of the pendulum and inversely as the square root of the acceleration due to gravity. find the period when the length is 144 cm and the acceleration due to gravity is 980 cm per second squared, if the period is 7pi seconds when the length is 289 cm and the acceleration due to gravity is 980 cm per second squared.