(i)[4]
Determine the distance of the lamina’s centre of mass from $AB$ and the distance from $AD$.
(ii)[2]
The lamina is freely suspended at $A$ and comes to rest in equilibrium. Calculate the angle between $AB$ and the vertical.
Mathematics 9709 · AS & A Level · Representation of data
Representation of data — practice question
ABCD is a uniform lamina with $AB = 1.8\,\text{m}$, $AD = DC = 0.9\,\text{m}$, and $AD$ is perpendicular to both $AB$ and $DC$ (see diagram).
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This 6-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Applies the balance of moments or table-of-values method to form $2m \times 0.45 + m \times 0.3 = 3mv$” …
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