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System of Particles and Rotational Motion

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System of Particles and Rotational Motion
  1. A ring of mass m and radius r rotates about an axis passing through its centre and perpendicular to its plane with angular velocity ω. Its kinetic energy is
    1. 1
      		mr²ω²
      2
    2. mrω²
    3. mr²ω²
    4. 1
      		mrω²
      2
Correct Option: A

Kinetic energy =
1
Iω²
2

and for ring I = mr²
Hence, KE =
1
mr²ω²
2


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