A patient is to be given a blood transfusion. The blood is to flow through a tube from a raised bottle to a needle inserted in the vein (Fig.10-55). The inside diameter of the 4.0cm-long needle is 0.40 mm, and the required flow rate is 4.0cm3 of blood per minute. How high h should the bottle be placed above the needle? Obtain p and η from the Tables. Assume the blood pressure is 18 torr above atmospheric pressure.