Use conservation of angular momentum to find his final moment of inertia, I2.
I1*w1 = I2*w2
I2 = I1*(4.55/7.60) = 1.616 kg m^2
The final rotational KE is
(1/2) I2*(w2)^2 = (1/2)*1.616*(7.60)^2
(joules)
someone spinns with an angular velocity of 4.55rad/s with arms held out. his rotational inertia is 2.7kgm^2. whn the he pulls his arms in his angular velocity increases to 7.60rad/s. what is his rotary ek?
3 answers
thanks
i got 2.790 is that correct