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At 20°C, the viscosity of water is 1.0x10-3
Pa-s and the viscosity of molasses is 51 Pa-s.
Consider two tubes of the same length L, with
fixed pressure difference Ap across each pipe.
If water flows through Pipe 1 and molasses
flows through Pipe 2, and both have the same
flow rate Q, what is the ratio of the radius of
Pipe 2 to Pipe 1?

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