on — is no longer necessarily the motion, the body being smooth and the same in all directions, as it would be in medium frictionless. Describe a sphere of unit radius with a vacuum. Consider an elongated projectile of revo- center O, and let OZ be the direction of lution moving in air under no… … moment of inertia of the body about an at O, and looking at the concave side of equatorial axis. the sphere — just as the eye sees the con- If r be the component angular velocity cave side of the celestial sphere.) The about the axis OC of figure, then, since this angular velocity will not stir up…
Engineering
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