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6. system of particles and rotational motion — Physics STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 SciencePhysics6. system of particles and rotational motion1 Mark
MCQ
A uniform solid sphere of mass $m$ and radius $r$ rolls without slipping down a inclined  plane, inclined at an angle $45^o$ to the horizontal. Find the magnitude of minimum  frictional coefficient at which slipping is absent-
  • A
    $\frac{1}{3}$
  • ✓
    $\frac{2}{7}$
  • C
    $\frac{1}{5}$
  • D
    $\frac{1}{7}$
✓

Answer

Correct option: B.
$\frac{2}{7}$
b
$\mu \geq \frac{\mathrm{k}^{2}}{\mathrm{r}^{2}+\mathrm{k}^{2}} \tan \theta$

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