A woman stands on a platform (with a frictionless pivot), which is rotating with an angular speed of 5.20 rad/s. Her arms are outstretched, and the rotational inertia of the platform+woman system is 5.4 kg·m2. She then pulls her arms in, so that now the system's rotational inertia is 4.20 kg·m2.
What will be her new angular speed when she pulls her arms in?
I'm not sure how to approach this problem, please help!
2007-12-02 11:53:40 · 2 answers · asked by =P 6 in Science & Mathematics ➔ Physics
Conservation of angular momentum. The starting angular momentum
5.4*5.2
is equal to the final angular momentum
4.2*wf
set equal and solve for wf
wf=5.4*5.2/4.2
wf=6.7
j
2007-12-03 05:10:26 · answer #1 · answered by odu83 7 · 0⤊ 0⤋
hi, i do not imagine C is a best answer. There can be a case the position the kinetic skill will advance. as an celebration if the device change into 2 separate balls. One rigidity appearing on ball a million to the left, one rigidity appearing on ball 2 to the right. both balls might want to %. up speed. although, finished linear momentum will be conserved.
2016-10-25 08:19:22 · answer #2 · answered by ? 4 · 0⤊ 0⤋