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Results of measurements of free falling acceleration of a closed containerwith a rotor of a mechanical gyroscope placed inside it on the frequency of therotor rotation are briefly described. Time of separate accelerationsmeasurements is 40 ms, the period of sampling is from 0.5 up to 1.0 minute. Inrotation's frequencies range of 20-400 Hz, the negative changes of free fallingcontainer acceleration prevail. On individual frequencies the "resonant" maximaand minima of acceleration are observed. The obtained data apparentlycontradict the equivalence principle of inertial and gravitating masses. Theexpediency of development of ballistic gravimetry of high time resolution withuse of rotating or oscillating test bodies is noted.

Frequency Dependence of Rotor's Free Falling Acceleration and Inequality of Inertial and Gravity Masses