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Question: Answered & Verified by Expert
A disc of radius R is rotating with an angular speed ωoabout a horizontal axis. It is placed on a horizontal table. The coefficient of kinetic friction is µk.Calculate the time taken for the rolling to begin.
ChemistryRotational MotionNEET
Options:
  • A $\frac{2R{{\omega }_{o}}}{{{\mu }_{k}}\left( 1+\frac{m{{R}^{2}}}{I} \right)}$
  • B $-\frac{R{{\omega }_{o}}}{{{\mu }_{k}}\left( 1+\frac{m{{R}^{2}}}{I} \right)}$
  • C $\frac{R{{\omega }_{o}}}{{{\mu }_{k}}\left( 1-\frac{m{{R}^{2}}}{I} \right)}$
  • D $\frac{R{{\omega }_{o}}}{{{\mu }_{k}}\left( 1+\frac{m{{R}^{2}}}{I} \right)}$
Solution:
1492 Upvotes Verified Answer
The correct answer is: $\frac{R{{\omega }_{o}}}{{{\mu }_{k}}\left( 1+\frac{m{{R}^{2}}}{I} \right)}$
Correct Option is : (D)
$\frac{R{{\omega }_{o}}}{{{\mu }_{k}}\left( 1+\frac{m{{R}^{2}}}{I} \right)}$

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