Posted by John1234 on .
If a trapeze artist rotates twice each second while sailing through the air, and contracts to reduce her rotational inertia to onethird, how many rotations per second will result?

PHYSICS 
Elena,
According to the Law of conservation of angular momentum
L1= L2,
I1•ω1=I2•ω2.
ω1=2πn1
ω2=2πn2
I2=I1/3.
Then n2=(I1/I2)n1=3•2=6 s1