The problem of motion of the cylindrical reservoir, partially filled with liquid, on pendulum suspension is considered in combined statement. The system motion occurs under the presence of uniform outflowing of liquid with the neglect of outflowing local effects. It was shown that the constructed mathematical model of the system describes the main mechanical effects and does not violate the conservation laws. Peculiarities the system dynamics under the presence of liquid outflowing are shown by the numerical examples of the system behavior for initial kinematic perturbation and under the external impulsive loading. Effect of the Coriolis forces in developmentr of wave motion on a liquid free surface under the presence of outflowing and for constant liquid volume is characterized. It was ascertained that the Coriolis forces promotes development of wave motion on a free surface of liquid, but suppress amplitudes of high-frequency normal modes.

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