Competitive divers pull their limbs in and curl up their bodies when they do flips. Just before entering the water, they fully extend their limbs to

Question

enter straight down. Explain the effect of both actions on their angular velocities. Also explain the effect on their angular momenta.

Answer 1

Before entering the water, the divers pull their limbs in and curl up their body.
Doing so, they gain angular momentum along the center of the mass of the body, the gravitational force acting on the center of the mass exerts torque on the body and increase the angular velocity and hence the rotational kinetics energy as well as angular momentum increases