MHT CET 2025 Physics question
Two discs of moment of inertia ‘’ and ‘’ and angular speeds ‘’ and ‘’ are rotating along the collinear axes passing through their centre of mass and perpendicular to their plane. If the two discs are made to rotate together along the same axis, the rotational kinetic energy of the system will be
Answer: (D)
Solution
No external torque acts, so angular momentum is conserved: (discs rotating in the same sense), giving the common angular speed . Rotational kinetic energy of the combined system: \dfrac{1}{2}$ +
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