A thin circular disc of mass M and radius R is rotating in a horizontal plane about an axis passing through its centre and perpendicular to its plane with angular velocity ω. If another disc of same dimensions but of mass M / 2 is placed gently on the first disc co-axially, then the new angular velocity of the system is:

Rotational Motion: JEE Main 2024 Physics question

JEE Main 2024 · 8 Apr, Evening shift · Q8062

JEE Main 20248 Apr, Evening shiftPhysicsHardRotational Motion140× since 2002

A thin circular disc of mass

\mathrm{M}

and radius

\mathrm{R}

is rotating in a horizontal plane about an axis passing through its centre and perpendicular to its plane with angular velocity

\omega

. If another disc of same dimensions but of mass

\mathrm{M} / 2

is placed gently on the first disc co-axially, then the new angular velocity of the system is :

JEE Main 2024 Rotational Motion Question with Solution (8 Apr Evening shift, Q8062) | JEE Arc