附件24.3 problem2-7 problem2-8 2-9A hydraulic pump at a flow rate of 16L/min is located under the oil surface.The oil kinematic viscosity0.1lcm/s,the oil density=80g/mthe coefficient of local resistance in the bend .and the other dimensions are shown in the figure.What is the absolute pressure at the inle port of the hydraulic pump 200 problem 2-9 problem 2-10 2-10 A type of liquid with a density of 90kg/mis flowing through a tube.Here h is 15m(see the figure) the pressures at I and 2 are 4.5x10Pa and 4x10Pa respectively.What is the flowing direction of the liquid inthe tube? 2-11 A flat is inserted into the free jet of water and vertical to the jet axes,cutting off part of the jet flow and causing the rest jet flow to swerve an angle of a.If the jet speed is=30m/s,the total flow rate=30L/s,and=12/s,what is the angle of a and the applying force F on the flat 2-12 A piston 20mm in diameter is moving downwards under a force of 150N.which forces the oil in the hydraulic cylinder out to the atmosphere through a narrow gap (.05mm)Assume the piston and the cylinder tube are set inline and the gap length is 70mm and the oil dynamic viscosity=. How long would it experience for the piston to drop down by 0.1m?附件 24.3 problem 2-7 problem 2-8 2-9 A hydraulic pump at a flow rate of 16L/min is located under the oil surface. The oil kinematic viscosity /11.0 scm 2 ν = , the oil density , the coefficient of local resistance in the bend position 3 ρ = /880 mkg ε = 2.0 , and the other dimensions are shown in the figure. What is the absolute pressure at the inlet port of the hydraulic pump? problem 2-9 problem 2-10 2-10 A type of liquid with a density of 900kg/m3 is flowing through a tube. Here h is 15m (see the figure), the pressures at 1 and 2 are and respectively. What is the flowing direction of the liquid in the tube? Pa 5 ×105.4 Pa 5 ×104 2-11 A flat is inserted into the free jet of water and vertical to the jet axes, cutting off part of the jet flow and causing the rest jet flow to swerve an angle of α. If the jet speed is , the total flow rate , and 1 q = /30 smv = /30 sLq /12 sLq1 = , what is the angle of α and the applying force F on the flat? 2-12 A piston 20mm in diameter is moving downwards under a force of 150N, which forces the oil in the hydraulic cylinder out to the atmosphere through a narrow gap (δ=0.05mm).Assume the piston and the cylinder tube are set inline and the gap length is 70mm, and the oil dynamic viscosity . How long would it experience for the piston to drop down by 0.1m? ⋅×= sPa −3 μ 1050