Higher 2 Physics Preliminary Exam Papers (2007)- 9745/01

Latest H2 Prelim Physics Examination Papers
(PJC, RJC, TJC, TPJC, VJC, YJC, NJC, CJC, HCI, MI, ACJC)
Syllabus 9745/01, 9745/02, 9745/03
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TPJC H2 Prelim Paper 1,2,3 2007 (9745/01) - Preview
Paper2/Q2:The satellite at a distance of 4.225 x 107 m from the centre of the Earth receives radio waves from an Earth station which is directly beneath it and 0.638 x 107 m from the centre of the Earth. Consider the Earth station as a point source of radio waves of power 8.0 kW. This power spreads out at an angle of 0.500 as shown in Fig. 2.1 below.

Paper1/Q21:In a water heater, water at 27 C flows in through an inlet pipe and gets heated up. The hot water then flows though the outlet pipe at 45 C. The rate of water flow is 4.0 kg per minute and the heat lost to the surrounding is 25 kW. The specific heat capacity of water is 4200 J kg-1 K-1. What is the power of the heater?