(a) State two objects each used in sports and warfare which may be considered as projectiles.
(b) the horizontal range R, of a projectile is given by the expression;
R = \(\frac{u^2 sin 2\theta}{g}\) where \(\theta\) is the angle of projection, g the acceleration of free fall due to gravity and u the initial velocity. At what value of \(\theta\) will R be maximium?
(a) What is surface tension?
(b) State two methods by which the surface tension of a liquid can be reduced.
(a) Explain diffusion
(b) State one factor that can affect the rate of diffusion.
(a) List two types of waves, apart from light, that can be plane polarized.
(b) State two applications of plane polarized light.
