[phpzon]Original Spinning, 30, SportingGoods[/phpzon] A figure skater is spinning at a rate of 1.4 rev/s with her arms outstretched.?

A figure skater is spinning at a rate of 1.4 rev/s with her arms outstretched. She then draws her arms in to her chest, reducing her rotational inertia to 69% of its original value. What is her new rate of rotation? rev/s

Angular velocity x rotational inertia = constant. We'll use the following equation to represent the above: A x R = C Let's just call the original value for "A" 100%, since we don't have an actual value We are given an "R" of 1.4 rev/sec. so 100% x 1.4 = C and we are also told that 69% x R = C We reduced the original 100% by multiplying by 69%, so we must DIVIDE the original value for R (the 1.4) by the same factor to keep "C" the same... 1.4 / .69 = 2.03 rev/sec. is the new value for R.