You must measure the viscosity of an oil that has an SG of 0.92 . To do this, you put the oil into a large container to the bottom of which a small vertical tube, $25 \mathrm{~cm}$ long, has been attached through which the oil can drain by gravity (see Figure P6.6). When the level of the oil in the container is 6 in. above the container bottom, you find that the flow rate through the tube is $50 \mathrm{~cm}^{3} / \mathrm{min}$. You run the same experiment with water instead of oil and find that under the same conditions the water drains out at a rate of $156 \mathrm{~cm}^{3} / \mathrm{min}$. If the loss coefficient for the energy dissipated in the contraction from the container to the tube is 0.5 , what is the viscosity of the oil?

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