Physics

Problem

A figure skater spins with arms extended at

2.0\,\text{rad}\,\text{s}^{-1}

. Pulling her arms in reduces her moment of inertia from

4.0\,\text{kg}\,\text{m}^2

1.5\,\text{kg}\,\text{m}^2

. Calculate her new angular speed, to two significant figures.