A hypodermic needle of length 3.0 cm and i.d. 0.45 mm is used to draw blood (

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A hypodermic needle of length 3.0 cm and i.d. 0.45 mm is used to draw blood (η = 4.0 mPl). Assuming the pressure differential across the needle is 80 cmHg, how long does it take to draw 15 mL?

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