Paper 5 May/June 2008 MATHEMATICH (9709/5) A Levels
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A uniform lamina $ABCD$ consists of a semicircle $BCD$ with centre $O$ and diameter $0.4{\text{ }}m$, and an isosceles triangle $ABD$ with base $BD = 0.4{\text{ }}m$ and perpendicular height $h{\text{ m}}$. The centre of mass of the lamina is at $O$.
a) Find the value of $h$.
b) The lamina is suspended from a vertical string attached to a point $X$ on the side $AD$ of the triangle (see diagram). Given the lamina is in equilibrium with $AD$ horizontal,…