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Calculate, to two significant figures, the weight of the disc.
Physics 9702 · AS & A Level · Density and pressure
Density and pressure — practice question
A round disc is illustrated in Fig. 1.1. Its diameter is $28\,\text{mm}$ and its thickness is $12\,\text{mm}$. The disc is made from a material with density $6.8 \times 10^3\,\text{kg m}^{-3}$.
Worked solution & mark scheme
This 4-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Apply cylinder volume $V = \pi r^2 h = \pi (14 \times 10^{-3})^2 (12 \times 10^{-3}) = 7.389 \times 10^{-6}\,\text{m}^3$” …
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