Question

Russian ice skater, Alina Zagitova, spins her way to projected Gold in the 2018 Olympics. During one particular spin, she moves from a camel spin that rotates at about 95.0 RPM to a tight spin. If her rotational inertia changes from 129kgm² to 32.0kgm², what is the final spin rate of Miss Zagitova in rad/s and RPM

Answer 1

 By conservation of angular momentum

I1*ω1 = I2*ω2 -----> I1*ω1/I2 = 129*95/32 = 383 RPM <<<<<

383 rev/min * 2πrad/rev * 1min/60s = 383*2π/60 = 40.1 radians/s <<<