Question Q1 Q2 Q3 Q4 Marks 15 25 20 20 Q1: A...

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Fluid Mechanics I ENGR 2097 ° Winter 2016 ASSIGNEMNT 1 *** Please refer to the course outline on D2L for assignment policies *** Question Q1 Q2 Q3 Q4 Marks 15 25 20 20 Q1: A 50-cm × 30-cm × 20-cm block weighing 150 N is to be moved at a constant velocity of 0.8 m/s on an inclined surface with a 0.4-mm-thick oil film between the block and inclined surface. The oil has a dynamic viscosity of 0.012 Pa s, and please determines the required force F Q2: A liquid with viscosity µ is confined between two concentric circular surfaces of length L . The radii of the inner and outer surfaces are i R and o respectively. The outer hollow cylinder is stationary and the inner solid cylinder is moving in the axial direction at velocity U . The axial velocity of the liquid is given as ) ln (ln ) / ln( ) ( 0 R r R R U r o i = , where r is the radial position. (a) Find the magnitude of the shear stress exerted on the inner cylinder surface by the fluid. (5 marks) (b) Find the magnitude of the shear stress exerted on the outer cylinder Q5 Q6 10 10 . R , u

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