Задача id12737

A spherical cavity is made in a lead ball with radius R, the surface of which touches the ball and passes through its center (Fig. 52). The mass of the solid ball was equal to M. With what force will the lead ball attract a small ball of mass m, located at a distance d from the center of the lead ball, along the continuation of the straight line connecting the center of the lead ball with the center of the cavity?

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