A particle dropped from a vertical height and falls freely for a time interval t. Sketch and explain a graph to show how h varies with (a) t (b) t\(^{2}\).

The diagram below represents the graph of the force applied in stretching a spiral spring against the corresponding extension produced within its elastic limit.

Using the notations on the graph, determine the:

(a) force constant of the spring;

(b) work done in stretching the spring from 10 x 10\(^{-2}\)m to 20 x 10\(^{-2}\)m.

(a) Distinguish between the forces of adhesion and cohension

(b) Give one example each of the forces of adhesion and cohesion.

 Explain why water in a narrow glass tube has a concave meniscus while mecury in the same tube, has a convex meniscus

(a) State two applications of electrolysis.

(b) Explain what is meant by the electrochemical equivalent of copper is 3.3 x 10\(^{-7}\) kgC\(^{-1}\)