एक भारी घूमता हुआ पिंड, जो बाहरी बलों की क्रिया के तहत अन्य दिशाओं में घूमने के लिए स्वतंत्र होता है, क्या कहलाता है?

A disc spinning on its axis at 20 rad/s undergoes precession when a torque of 100 Nm is applied about an axis normal to the spin axis. If the mass moment of inertia of the disc is 1 kg·m2, what is its angular velocity of precession?

The rotor of a ship rotates in a clockwise direction when viewed from the stern. If the ship takes a left turn, what will be the effect of the reactive gyroscopic couple acting on it?