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| 1. |
Three partical , each of mass m , are situated at the verticals of an equilateral triangle ABC of side L .find the moment of inertia of the system about the line AX perpendicular to AB in the plane of ABC . |
| Answer» N : Perpendicular DISTANCE of A from AX = 0 Perpendicular distance of B from AX = L Perpendicular distance of C from AX = L/2 Thus, the MOMENT of inertia of the PARTICLE at A = 0 of the partical at B = mL² , and of the partical at C = m(L/2)² , The moment of inertia of the THREE - particle system about AX is 0 + ML² + M(L/2)² = 5ML²/4 Now that the particle on the axis do not contribute to the moment of inertia . ____________________________ | |