A patient is given a blood transfusion through a hypodermic needle inserted in a vein. The inner diameter of the 3cm long needle is 0.65mm, and the venous pressure of the patient is 20mmHg. What should the elevation difference be between the needle and the bottle containing the blood so that the transfusion proceeds at the rate of 18mL/min? Assume that the plastic tube carrying the blood from the bottle to the needle introduces negligible resistance to flow
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