• # question_answer The mass moment of inertia of the two motors in a two rotor system arc $100\,\,kg.{{m}^{2}}$ and $10\,\,kg.{{m}^{2}}.$ the length of the shaft of uniform diameter between the rotors is 110 cm. The distance of node from the rotor of lower moment of inertia is: A) 80 cm              B) 90 cmC) 100 cm             D) 110 cm

${{l}_{2}}=\left( \frac{{{J}_{1}}}{{{J}_{1}}+{{J}_{2}}} \right)\,l=\frac{100\times 10}{(100+10)}=100\,\,cm$