please do parts a&b -) Cle sncun, l https//usp32nj theoperttacom.CommentskeTAori

Question

please do parts a&b

-) Cle sncun, l https//usp32nj theoperttacom.CommentskeTAorialAssignmenta.pr Homework ET (Ch 10: Rotation of a Rigid Object) Begin Date: 99162017 1200.00ate 12/20/2017 12:00:00 AM 150PM Ead ate ai%) Problem S: Suppose we want tu calculate the moment ofi ortada,1 kg skaer, relevoto, vatal center of mass auto-hdet Assigament Status Click here for detailed vie 50% Part (a) Fzit calculate the moment of mertin m kg my when the skater has ther arms pulled inward by assuming they re eylindr af t dsus 8.151m Problem States 16- Potectial 100% 1 Partial 2 Partial 4 Coempleted 6 Complesed cotan asin acos) Degrees Radian S4be &S;% Part ) Now calculare the momest of nertia of the kater lin kw) with their arsis extended by asnansing tat each am ia 5 if the mass of ther body Assaue the body is a cylimdes of the same size, and the srms are 0 875 m long rods estending straigha out tiom thee body being rotated an the ends .

Explanation / Answer

a] Moment of Inertia of a cylinder about its central axis is given by:

I = (1/2)mr2

=> I = (1/2)(61)(0.15)2 = 0.68625 kgm2

b] Mass of each arm = 0.05 x 61 = 3.05 kg

so, the moment of inertia of the person will now be:

I = m'r'2 + m'r'2 + (1/2)mr2

I = 2(3.05)(0.875/2)2 + (1/2)(61 - 6.1)(0.15)2 = 1.7852 kgm2.

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