long solid cylinder of radius 0.8m hinged at point A is used as an automatic gate, as shown in Fig. 1. When the water level reaches 5m, the gate opens by turning about the hinge at point A. Determine a) the hydrostatic force acting on the 'cylinder and its direction when the gate opens. (2 marks) b) the weight of the cylinder per m length of the cylinder. (1 mark) c) Imagine that you are a Martian several billion years in the past (when there was still abundant water there). How would this affect the results obtained? Explain your answer. Density of Martian water is assumed to be identical to water on Earth. Mean density of Mars, Mars=3.93g/cm3, and Earth, Earth=5.51g/cm3 '2 marks) rig