Mathematics 9709 · AS & A Level · Representation of data

Representation of data — practice question

A uniform solid cone of height $0.8\,\text{m}$ and semi-vertical angle $30^\circ$ weighs $20\,\text{N}$. It is in equilibrium, supported by just one point $P$ on its base touching a rough horizontal surface, with the vertex $V$ positioned vertically above $P$. The equilibrium is kept by a force of magnitude $F\,\text{N}$ acting along the cone’s axis of symmetry and applied at $V$ (see diagram).
(i)[2]

Show that the moment of the cone’s weight about $P$ is $6\,\text{N m}$.

(ii)[2]

Hence determine $F$.

Worked solution & mark scheme

This 4-mark question has a full step-by-step worked solution and mark scheme. One marking point: Determines horizontal distance $=0.8 \times \frac{3}{4} \times \sin 30$ or equivalent

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