Angular Momentum

According to NCERT Class 11, Chapter 7 (System of Particles and Rotational Motion), the angular momentum of a rigid body rotating about a fixed axis is L = Iω, the rotational analogue of the linear momentum p = mv. It quantifies the amount of rotational motion a body possesses and is the quantity that an external torque must act on to change the spin. Because angular momentum is conserved when no external torque acts, it is a central quantity in rotational dynamics. Substituting the turntable data gives L = 0.6 × 10 = 6 kg·m²/s. The option 60 kg·m²/s ignores the decimal point in the moment of inertia and is ten times too large. The option 0.06 kg·m²/s applies an incorrect extra factor of ten in the opposite direction. The option 16.7 kg·m²/s arises from mistakenly dividing rather than multiplying the two quantities. A dimensional check confirms that kg·m² multiplied by s⁻¹ gives the correct angular-momentum units of kg·m²/s, and a value of 6 kg·m²/s is a reasonable result for a moderately heavy turntable spinning steadily at 10 rad/s.