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System of Particles and Rotational Motion
  1. A fly wheel rotating about a fixed axis has a kinetic energy of 360 joule when its angular speed is 30 radian/sec. The moment of inertia of the wheel about the axis of rotation is
    1. 0.6 kg/m²
    2. 0.15 kg m²
    3. 0.8 kg m²
    4. 0.75 kg m²
Correct Option: C

Er =
1
Iω²
2

I =
2Er
 =
2 × 360
 = 0.8 kgm²
ω²30 × 30


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