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Standard XII

Physics

Rotational Inertia

Two masses of...

Question

Two masses of $200$ gm and $300$ gm are attached to the $20$ cm and $70$ cm marks of a light meter scale respectively. The moment of inertia of this system about an axis passing through $50$ cm mark will be

0.3 K g / m^{2}

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0.03 K g / m^{2}

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0.15 K g / m^{2}

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z e r o

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Solution

The correct option is B $0.03 K g / m^{2}$
The moment of inertia would be $0.3 \times (0.2)^{2} + 0.2 \times (0.3)^{2} = 0.03 K g / m^{2}$

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Two masses of 200 gm and 300 gm are attached to the 20 cm and 70 cm marks of a light meter scale respectively. The moment of inertia of this system about an axis passing through 50 cm mark will be

The correct option is B 0.03Kg/m2The moment of inertia would be 0.3×(0.2)2+0.2×(0.3)2=0.03Kg/m2

Two masses of $200$ gm and $300$ gm are attached to the $20$ cm and $70$ cm marks of a light meter scale respectively. The moment of inertia of this system about an axis passing through $50$ cm mark will be

The correct option is B $0.03 K g / m^{2}$
The moment of inertia would be $0.3 \times (0.2)^{2} + 0.2 \times (0.3)^{2} = 0.03 K g / m^{2}$