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第26届国际物理奥林匹克竞赛实验试题及解答（英文）
Experimental Question 1
Terminal velocity in a viscous liquid
An object falling in a liquid will eventually reach a constant velocity, called the terminal velocity. The aim of this experiment is to measure the terminal velocities of objects falling through glycerine. For a sphere of radius r falling at velocity v through a viscous liquid, the viscous force F is given by F = 6¼´rv. Here ´ is a property of the liquid called the viscosity. In this experiment you will measure the terminal velocity of metal cylinders (because cylinders are easier to make than spheres). The diameter of each cylinder is equal to its length, and we will assume the viscous force on such a cylinder is similar to the viscous force on a sphere of the same diameter, 2r:
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