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Physics Revision for IGCSE Essay

The diagram below shows a pendulum bob in five phases of its oscillation path. The pendulum bob is at rest in position 3. 100 John brings the pendulum bob to position 1 and releases the bob. The length of the pendulum string I is 30. 0 CM. Take the gravitational field strength to be 9. 8 m s-2. Calculate the period of the pendulum oscillation. The vertical height displacement of the pendulum bob between positions 1 to 3 is 5 CM. Determine the maximum velocity attained by the pendulum bob.

The pendulum bob completes one oscillation and returns to its initial position. Explain why the average velocity of the pendulum bob is zero for this oscillation. Question 2 A solid cube of side 3 CM has a density of 8. 0 g CM-3. The solid cube is placed on top off table. Take the gravitational acceleration to be 9. 8 m s-2. Calculate the pressure that the solid cube exerts on the table. Determine the pressure that the table exerts on the solid cube. Explain how you came to your answer. Physics Secondary 4 ‘GEESE Page 2 of 3 Question 3 A toy car of weight AN is supplied with a power of 6.

W. The toy car travels a straight line distance of mm in 5 seconds from its point of origin Calculate the efficiency of the toy car. Explain why the toy car could not have possibly covered the mm distance in 2 seconds. The toy car undergoes deceleration. Sketch the displacement-time graph of toy car for time to t=10. Question 4 List three factors which will increase the rate of evaporation of water. Question 5 Define the specific heat capacity of a substance. Question 6 Cubes of ice (-ICC) were placed in a beaker. The beaker of ice was then heated using a Bunsen burner.

The ice changed into water through Process X and eventually boiled off as water vapor (ICC). (a) State the two main processes that facilitated the transfer of heat energy. Identify process X. Define the latent heat of vaporization of a substance. Sketch a graph of temperature against time for the substance in the beaker. Question 7 Distinguish between a transverse wave and a longitudinal wave. Light is an example of a transverse wave. State an example of a longitudinal wave. Red light has a wavelength of 600 NM. Calculate the frequency of red light.

State the alee of any constant that you used in your calculations. State any two properties of a transverse wave. Question 8 Explain the application of Kennel’s Law in the structure of the optical fibers. Physics secondary 4 ‘GEESE Page 3 of 3 Question 9 An object is placed 10 CM away from the focal lens. The focal lens has a focal length of 10 CM. State three characteristics of the image formed. Sketch a ray diagram for this situation. Question 10 White light enters a glass prism. The white light splits into a spectrum of colors. Explain why the spectrum is only seen after entering the glass prism.

Question 1 1 Some digital circuits make use of logic gates. All circuits experience energy loss by heating. (a) The power loss by heating is the product of the resistance R and the square of current flow l: P = ERR From the expression above, derive that energy lost E = I V t, where V is the voltage of the circuit and t is the time taken. Construct a truth table to illustrate the function of the AND gate. Question 12 Define an isotope. Uranium-238 (U) has 146 neutrons. Uranium-238 (U) undergoes alpha decay to form thorium-234 (The). Construct the full alpha decay equation for uranium-238 (U).

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