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Question: 4 as part of a manufacturing process a wire of...

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4. As part of a manufacturing process, a wire of diameter d is pulled through a cylindrical die of length L The lubricant that fills the gap of thickness h between the shaft and bearing is an oil with viscosity u and density ρ. Assuming that the velocity varies linearly across the gap, and that d 《 h, derive the equation giving the force F needed to pull the shaft at a velocity V. gap width h housing shaft

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