At t 2, the angular velocity is zero, with a non-zero (positive) angular acceleration. At that time, the direction of rotation for BC is changing from CW to CCW. In summary, you should never assume ...

This happens because angular momentum is conserved. Angular momentum is an object's moment of inertia times its angular velocity. If one of the latter two increases, the other decreases, and vice ...

By pulling the legs and arms closer to the point of rotation, the moment of inertia decreases and the angular velocity increases. A tighter tuck means a faster rotation.

Stretching the limbs out will increase the moment of inertia, therefore decreasing the angular velocity — which is essential for a neat and flawless dive into the water.

At the first position, the person has an angular velocity and moment of inertia of: Quick note: the "2" subscript is there because this is after the person jumped off the merry go round.

American Journal of Botany, Vol. 67, No. 8 (Sep., 1980), pp. 1218-1224 (7 pages) Strobe photographs were taken of over 200 spinning samaras from seven species of trees. These were used to measure the ...