Answer Happy

Question 4 a) The diagram in figure Q4a below shows a pump delivering water through a pipe of 30 mm diameter to a very large tank where the free water surface is assumed to remain at a constant height. The measured total pressure drop along the pipe (between points 1 and 2) is 50 kPa. Take water density = 1000 kg/m², water flow rate = 1.4 l/s, Patm = 1 bar and g = 9.81 m/s2. i) Explain where and why these pressure drops occur. [6 marks) ii) Find the pressure at point 1 (exit from the pump). [14 marks] 25 m Figure Q4a b) What range of colours would you use on a flat roof to minimise solar heat gain in a hot climate? In your own words, explain your choice and reasoning. [5 marks]