System of Particles and Rotational Motion - Result Question 69

76. A fly wheel rotating about a fixed axis has a kinetic energy of 360 joule when its angular speed is 30radian/sec. The moment of inertia of the wheel about the axis of rotation is

(a) 0.6kg/m2

(c) 0.8kgm2

(b) 0.15kgm2

(d) 0.75kgm2

[1990]

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Answer:

Correct Answer: 76. (c)

Solution:

(c) Er=12Iω2

I=2Erω2=2×36030×30=0.8kgm2



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