Io= 3.2 kgm2
When setting Lo=Lf
IoWo=IfWf
A ballet student with her arms and a leg extended spins with an initial rotational speed of 0.90rev/s . As she draws her arms and leg in toward her body, her rotational inertia becomes 0.80 kg⋅m2 and her rotational velocity is 4.1rev/s .
Determine her initial rotational inertia.
3 answers
You have to convert rev to rad
Because momentum inertia is conserved in a system
I (final) = I(initial) = 0.8kg * m^2
I (final) = I(initial) = 0.8kg * m^2