R. Una bailarina gira con una frecuencia de 1hz y momento de inercia i = 28.14kg . M2. Calcule su velocidad de giro cuando disminuye su momento de inercia a la mitad.

 w = 4π   rad / s

Explanation:

When the dancer is turning, the body is isolated so the angular momentum is conserved.

initial

         L₀ = I₀ w₀

final

         L_f = I w

in this case it indicates that the initial moment is Io = 28.14 kg m² and the final moment is half

         I = I₀ / 2

frequency and angular velocity are related

         w = 2π f

          w = 2π 1

          wo = 2π   rad / s

how angular momentum is conserved

          L₀ = L_f

          I₀ w₀ = I w

          w =  w₀

let's calculate

          w = 2 2π

          w = 4π   rad / s

i think it’s a. this is because if they measured the mass of something with a mass of 150g, then their final answer would have to be approximately 150g. though all of their answers are almost 150, rosa and tran have the closest answers (or the exact answer) to the accurate one.

i don’t know what the answer is i wish i