Moderate -0.8 This is a straightforward application of circular motion formulas requiring only direct substitution into F = mω²r with all values given. It's a single-step calculation with no conceptual challenges or problem-solving required, making it easier than average but not trivial since students must recognize which formula applies.
A horizontal circular disc rotates with constant angular speed \(9 \text{ rad s}^{-1}\) about its centre \(O\). A particle of mass \(0.05 \text{ kg}\) is placed on the disc at a distance \(0.4 \text{ m}\) from \(O\). The particle moves with the disc and no sliding takes place. Calculate the magnitude of the resultant force exerted on the particle by the disc. [3]
A horizontal circular disc rotates with constant angular speed $9 \text{ rad s}^{-1}$ about its centre $O$. A particle of mass $0.05 \text{ kg}$ is placed on the disc at a distance $0.4 \text{ m}$ from $O$. The particle moves with the disc and no sliding takes place. Calculate the magnitude of the resultant force exerted on the particle by the disc. [3]
\hfill \mbox{\textit{CAIE M2 2010 Q1 [3]}}