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Physics 9 Online
OpenStudy (abmon98):

http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Mathematics%20%289709%29/9709_s11_qp_53.pdf q7)

OpenStudy (abmon98):

Shouldn't i calculate the Centres of mass of the circular sector of radius 1and angle 90 using the formula 2rsinx/3x and the area of that shape is pi/4

OpenStudy (irishboy123):

if you are allowed to use that formula, indeed that is what you should do. take the moment around the axis shown below. |dw:1427374981078:dw|

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