Part B Express your answer to two significant figures and include the appropriat

Question

Part B                      Express your answer to two significant figures and include the appropriate units.                      Ignoring her arm mass, what's her new rotational velocity? was the first question, and the answer was w1 = 0.77 rad/sec, but I cannot figure out the                        answer for the part B. A student sitting on a frictionless rotating stool has rotational inertia 0.88kg?m 2 kgm2 about a vertical axis through her center of mass when her arms are tight to her chest. The stool rotates at 6.70rad/s and has negligible mass. The student extends her arms until her hands, each holding a 5.3kg mass, are 0.80m from the rotation axis. Repeat if each arm is modeled as a 0.80m long uniform rod of mass of 4.5kg and her total body mass is 58kg . Express your answer to two significant figures and include the appropriate units. Ignoring her arm mass, what's her new rotational velocity? was

Explanation / Answer

(A)

angular momentum is conserved.
=>Ii?i = If?f.

Ii = 0.88 kg*m^2

?i = 6.70 rad/s

If = Ii + 2mr^2 = 6.3 kg*m^2.

=>?f = Ii?i/If = 0.81 rad/s.

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