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Q. A hypodermic needle consists of the plunger of circular cross-section that slides inside a hollow cylindrical syringe. When the plunger is pushed, the contents of syringe are forced through a hollow needle (also of circular cross-section). If a 4-N force is applied to the plunger and the diameters of the plunger and the needle are 1.2cm and 2.5mm, in that order, what force is needed to prevent fluid flow at the needle?

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