Calculate the moment of inertia of the circular hollow disk having a mass of 2 kg and an internal radius of 5 m and an external radius of 10 m.(a) 125 kgm^2(b) 127 kgm^2(c) 122 kgm^2(d) 123 kgm^2This question was posed to me by my school principal while I was bunking the class.My query is from Motors Rating and Heating topic in division Rating and Heating of Motors of Electric Drives

Calculate the moment of inertia of the circular hollow disk having a m

1.	Calculate the moment of inertia of the circular hollow disk having a mass of 2 kg and an internal radius of 5 m and an external radius of 10 m.(a) 125 kgm^2(b) 127 kgm^2(c) 122 kgm^2(d) 123 kgm^2This question was posed to me by my school principal while I was bunking the class.My query is from Motors Rating and Heating topic in division Rating and Heating of Motors of Electric Drives
Answer» Right answer is (a) 125 kgm^2 For explanation: The moment of inertia of the circular HOLLOW disk can be calculated USING the FORMULA I=M(R1^2+R2^2)÷2. The mass of circular hollow disk and radius is given. I=(1)×{(5)^2+(10)^2}=125 kgm^2. It depends upon the orientation of the ROTATIONAL axis.

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