A wire of length 5.0 m and diameter 2.0 mm extends by 0.25 mm when a force of 50 N was used to stretch it from its end. Calculate the;

(a) stress on the wire;

(b) strain in, the wire. [\(\pi = 3.142\)]

(a) List two factors that can affect the rate of diffusion
(b) State two examples to illustrate the effects of surface tension.

State two effects to show (a) the existence of matter waves;

(b) that radiation behaves like particles.

A stone projected horizontally from the top of a tower with a speed of 4 ms\(^{-1}\) lands on the level ground at a horizontal distance 25 m from the foot of the tower. Calculate the height of the tower. g = 10 ms\(^{-2}\)]

Define (a) tensile Stress; (b) tensile strain; (c) yield point.