a. Define strain energy.

b. Write an expression for the energy stored, E, in a stretched wire of original length, l , cross-sectional area, A, extension, e, and Young's modulus, Y, of the material of the wire.

a. A projectile is fired at an angle, θ, to the horizontal with velocity, u. Show that at any time, t, during the motion, the: i. horizontal component of the velocity is independent of t;

ii. vertical component of the velocity depends on t.

b. State the assumption on which projectile motion is based.

State three differences between geostationary satellites and polar satellites.

a. Using the kinetic theory, explain the term diffusion of fluid molecules.

b. Name one phenomenon that demonstrates that light behaves as a:

 i. wave ii. particles

a. State one difference between an intrinsic and an extrinsic semiconductor.

b. Draw a circuit diagram to illustrate full wave smoothing rectification.