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Rotational Motion question

2019 · 10 Apr · Shift 1 · Q55
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  5. /2019 · 10 Apr · Shift 1 · Q55

Rotational Motion question

2019 · 10 Apr · Shift 1 · Q55

JEE MainPhysicsRotational MotionMCQ+4 / −1
Two coaxial discs, having moments of inertia I1 and I1/2, are rotating with respective angular velocities ω\omegaω 1 and ω\omegaω 1/2 , about their common axis. They are brought in contact with each other and thereafter they rotate with a common angular velocity. If Ef and Ei are the final and initial total energies, then (Ef - Ei) is:
  1. A
    I1ω1224{{{I_1}\omega _1^2} \over {24}}24I1​ω12​​
  2. B
    I1ω1212{{{I_1}\omega _1^2} \over {12}}12I1​ω12​​
  3. C
    38I1ω12{3 \over 8}{I_1}\omega _1^283​I1​ω12​
  4. D
    I1ω126{{{I_1}\omega _1^2} \over {6}}6I1​ω12​​
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