(a) What is a geostationary satellite? 

 (b) Name two types of Lasers.

State:

(a) The S.I. unit of the intensity of a blackbody radiation.

(b) Two features of the intensity-wavelength graph of a perfect blackbody at different temperatures.

State three differences between magnetic and non-magnetic materials.

(a)(i) State the law of inertia.

(ii) Use the law stated in (a)(I) to explain how wearing a safety belt in a moving vehicle could reduce the possibilities of severe injuries when the vehicle is involved in a collision.

(b)(I) Define the term moment of a force.

(ii) A uniform plank measures 2 m long from its ends point A to point B. If the weight of the plank is 54 N and it rests on a knife edge 0.50 m from end B and point A is supported by a vertical string so that AB balances horizontally:

i. Draw a force diagram for the arrangement;

ii. Determine the tension, T, in the string.

iii. Determine the force, F, acting on the knife edge

(c) State three differences between solid friction and viscosity

(d) State one method of increasing the velocity ration of a pulley system.

(a)(i) State Coulomb's law of electrostatics.

(ii) The electron and proton of a hydrogen atom are separated by a mean distance of 5.2 x 10\(^{-11}\)m.

Calculate the magnitude of the electrostatic force between the particles.

[e = 1.6 x 10\(^{-19}\) C, (4\(\pi\) \(\mathcal{E}_{0}\))\(^{-1}\) = 9.0 x 10\(^{9}\) mF\(^{1}\)]

(b) The diagram below shows a potential divider circuit.

i. Show that V\(_{out}\) = V\(_{in}\) (\(\frac{R_{1}}{R_{1} + R_{2}})\)

ii. If \(\frac{V_{in}}{V_{out}}\) = 2.5 and R\(_{2}\) = 30\(\Omega\), calculate R\(_{1}\)

iii. Define the volt.

(c) Explain why wood is not suitable for use as the core of transformers.

(d) State one application for the cathode ray tube.