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[" 20.One quarter sector is cut from a u...

[" 20.One quarter sector is cut from a uniform circular disc of "],[" radius "R" .This sector has mass "M." It is made to rotate about "],[" a line perpendicular to its plane and passing through the "],[" center of the original disc.Its moment of inertia about the "],[" axis of rotation is "],[qquad ubrace(E_(90^(@)))=],[[" (I) "(1)/(2)MR^(2)," (2) "(1)/(4)MR^(2)],[" (3) "(1)/(8)MR^(2)," (4) "sqrt(2)MR^(2)]]

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