094402 - 4402 The University of Sydney Faculty of...

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4402 The University of Sydney Faculty of Engineering AMME 2200 Thermodynamics and Fluids Paper 2 : Fluids Mechanics November 2009 Time allowed 1.5hours Answer THREE questions only. All questions are of equal value, but subsections (a, b) of questions, are not. THIS IS A CLOSED-BOOK EXAM. Some formulae and data are attached. Page 10f6
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4402 ouestion·! a) A piston that is 80 mm in diameter and 100 mm long is driven through a cylinder, diameter 80.1 mm, with an axial velocity of 14 m/s. Oil with dynamic viscosity 0.12 Ns/m 2 is used for lubrication. Calculate the force and power needed to overcome viscous friction. b) The gate shown below has a radius of 4m and a width of 6 m. The gate is hinged as shown and is held at this position by a force P which acts 2m above the water level. P ---...----r-- 2m (i) Find the force P (in kN) needed to hold the gate in the position shown. (H) Find the horizontal and vertical components of the reaction forces at the hinge and show their directions.
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