Easy -1.2 This is a straightforward work done calculation requiring only the formula W = Fs cos θ combined with basic kinematics (s = vt). The question provides all necessary values explicitly and requires no problem-solving insight—just direct substitution into a standard formula. Significantly easier than average A-level questions.
1
\includegraphics[max width=\textwidth, alt={}, center]{918b65cc-617d-4942-8d96-b02eef21e417-2_262_711_248_717}
A ring is threaded on a fixed horizontal bar. The ring is attached to one end of a light inextensible string which is used to pull the ring along the bar at a constant speed of \(0.5 \mathrm {~m} \mathrm {~s} ^ { - 1 }\). The string makes a constant angle of \(24 ^ { \circ }\) with the bar and the tension in the string is 6 N (see diagram). Find the work done by the tension in a period of 8 s .
1\\
\includegraphics[max width=\textwidth, alt={}, center]{918b65cc-617d-4942-8d96-b02eef21e417-2_262_711_248_717}
A ring is threaded on a fixed horizontal bar. The ring is attached to one end of a light inextensible string which is used to pull the ring along the bar at a constant speed of $0.5 \mathrm {~m} \mathrm {~s} ^ { - 1 }$. The string makes a constant angle of $24 ^ { \circ }$ with the bar and the tension in the string is 6 N (see diagram). Find the work done by the tension in a period of 8 s .
\hfill \mbox{\textit{CAIE M1 2012 Q1 [3]}}