A steady push on the piston in Fig P6.22 causes a flow rate Q = 0.15 cm3/s through the needle. The fluid has ρ =

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A steady push on the piston in Fig P6.22 causes a flow rate Q = 0.15 cm3/s through the needle. The fluid has ρ = 900 kg/m3 and μ = 0.002 kg/ (m⋅s). What force F is required to maintain the flow?

D2 1 cm Di 0.25 mm 1.5 cm3 cm