Physics · 2020
JEE Main · 5 September 2020, Shift 1 · Q4
A wheel is rotating freely with an angular speed ω on a shaft. The moment of inertia of the wheel is I and the moment of inertia of the shaft is…
A wheel is rotating freely with an angular speed $\displaystyle \omega$ on a shaft. The moment of inertia of the wheel is I and the moment of inertia of the shaft is negligible. Another wheel of moment of inertia 3I initially at rest is suddenly coupled to the same shaft. The resultant fractional loss in the kinetic energy of the system is :
Official answer
(2)
$\displaystyle \frac{3}{4}$
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JEE Main 2020 Physics question, with the answer from NTA’s final answer key. Where our answers come from.