Physics · 2010
NEET 2010 · Prelims · Code A · Q9
A gramophone record is revolving with an angular velocity ω. A coin is placed at a distance r from the centre of the record. The static coefficient…
A gramophone record is revolving with an angular velocity $\displaystyle \omega$. A coin is placed at a distance $\displaystyle r$ from the centre of the record. The static coefficient of friction is $\displaystyle \mu$. The coin will revolve with the record if :
Official answer
(4)
$\displaystyle r \leq \frac{\mu \mathrm{g}}{\omega^2}$
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NEET (UG) 2010 Physics question, with the answer from NTA’s final answer key. Where our answers come from.