Waec 2025 Physics Question 9

(a) State one difference between deformation and elasticity. (b) The following results were obtained from an experiment performed on a spiral spring: \begin{tabular}[t]{|l|l|l|l|l|l|l|l|} \hline Stretching force/N & 0.0 & 1.0 & 2.0 & 3.0 & 4.0 & 5.0 & 6.0 \ \hline Extension/ cm & 0.0 & 5.0 & 10.0 & 15.0 & 20.0 & 25.0 & 30.0 \ \hline \end{tabular} (i) Plot a graph of stretching force on the vertical axis and extension on the horizontal axis (ii) Determine the slope, \( s \), of the graph (iii) What does the slope of the graph represent? (c) A rubber gun is used to project a stone of mass 40 g. If the rubber of the gun has an elastic constant \( 350 \mathrm{Nm}^{-1} \) and was stretched 4 cm, calculate the stone's speed of projection. (d)(i) Define bulk modulus. (ii) A vertical wire is suspended from a support with a mass of 2.5 g attached to the free end to stretch the wire. If the load on the wire extends it by 2 \( cm \), determine the energy gained by the wire. \( \left[g=10 m s^{-2}\right] \)