(Solved): (a) A water bug is suspended on the surface of a pond by surface tension as shown in Figure 5(a). ...

(a) A water bug is suspended on the surface of a pond by surface tension as shown in Figure 5(a). The bug has six legs, each in contact with the water over 5 mm. What is the maximum mass of the bug to avoid sinking? Given o = 0.073 N/m. (5 marks) 5 mm 5 mm Figure 5(a). Illustration of a water bug suspending on water surface. (b) The system shown on Figure 5(b) has a discharge of 0.25 m³/s, given that d = 15 cm, D = 30 cm, Az? = 2 m, and Az2 = 4 m. Neglect head loss and assume a = 1 everywhere. Determine whether the machine is a pump or a turbine? What are the pressures at point A and B? (10 marks) D Same elevation Water T = 10°C Machine B Az1 Figure 5(b) Illustration of the water system (c) Describe the conditions under which the hydrostatic equation may be seen as a simplified Bernoulli equation. (5 marks) R 2 of 5 ¯¯¯¯¯ AZ2