A little boy and little girl in a playground are sitting on a large metal disk which is rotating freely at a constant number of revolutions per minute. The boy is at the outer rim, and the girl is about halfway between the rim and the center. How do their accelerations compare

Agymnast dismounts off the uneven bars in a tuck position with a radius of 0.3m (assume she is a solid sphere) and an angular velocity of 2rev/s. during the dismount she stretches out into the straight position, with a length of 1.5m, (assume she is a uniform rod through the center) for her landing. the gymnast has a mass of 50kg. what is her angular velocity in the straight position?

Consider an insulating crystal, made up of layers of atoms. what form would you expect the temperature dependence of the phonon heat capacity to approach at extremely low temperatures if the interlayer coupling is i)very strong (rigid coupling), and ii) very weak. explain.

What equation is used to calculate the weight of an object on a plant ?