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... or corporation, or conveying ay rihts or permission to manufature, use or sell any patented invention that my in any way be related thereto. ABSTRACT An expression for the kinetic energy of an infinite liquid mass due to small motions of a submerged cylinder is obtained analytically. When the motion is described in terms of generalized coordinates, the corresponding inertia coefficients appear in the kinetic-energy expression. The analysis is carried out for the problem of a floating flexible rectangular box. Calculations are performed for generalized coordinates representing rigid-body motion and plastic deformation.