The graph in figure 5 shows the variation of temperature with time. (b) A solid of mass 1kg was heated uniformly by a 100W heating element until it melts. (a) Distinguish between boiling and evaporation. (55 MARKS) Answer ALL questions in this section 14. Calculate the elastic potential energy stored in the spring. A force of 20N is used to stretch a spring through 5cm. If water flows in the water pipe at a speed of 2ms -1, what is the speed in the narrower pipe 13. A pipe of radius 3mm is connected to another pipe of radius 9mm. An electric kettle with shiny outer surface is more efficient than one with a dull outer surface, give a reason for this. A car of mass 800kg is initially moving at 25m/s, calculate the force needed to bring the car to rest over a distance of 20m. State a reason why an air bubble increases in volume as it rises up the surface in a boiler. State a reason why more energy is required to change ice from 0 0 C to water at 1 0 C, than to change equal mass of water from 0 0 C to 0 0 C. A piece of plasticine is dropped on the trolley and sticks on it. A trolley is moving at uniform speed along a track. Top grade predictor publishers ΔΆ Air 5cm 16cm Mercury 14cm Air 5cm Figure 4 Use the information in figure 6 to calculate the value of the value of the atmospheric pressure in mmhg 7. Air is trapped in a thin capillary tube by a thread of mercury 5cm long as shown in figure 4. A mass of 8kg is whirled round in a vertical circle using a rope of length 80cm if it makes 2.5 cycles in 1 second, calculate the maximum tension the rope experiences. 26cm 12cm Figure 3 The reading indicated by the spring balance is 2.0N. A uniform 120m metal rod is pivoted near one of its ends and kept in equilibrium by a spring balance as shown in figure 3. 150N Figure 2 Determine the extension caused by the 150N weight (Ignore weight of springs and connecting rods) 4. The spiral springs shown in the figure 2 below are identical. A B Figure 1 When the two spheres are rolled on a horizontal surface, it is observed that the sphere B stops earlier than sphere A. Sphere A is completely filled with the liquid while B is partially filled with an identical liquid. Figure 1 shows two identical hollow spheres. Draw the micrometer screw gauge showing the diameter of the wire. If the actual diameter of the wire is 0.28mm. It is used to measure the diameter of a wire. A micrometer screw gauge has a zero error of -0.02mm. 1 MAKUENI COUNTY CLUSTER PREPARATORY EXAMINATION /1,232/2,232/3 physics 232/1 PHYSICS Paper 1 JULY/ AUGUST 2016 (THEORY) Time: 2 Hours SECTION (25 MARKS) Answer ALL questions in this section 1.