$A$ body slides down a smooth inclined plane having angle $\theta$ and reaches the bottom with velocity $v$. If the body is a solid sphere rolling down the same plane,then its linear velocity at the bottom of the plane is

  • A
    $\sqrt{\frac{2}{7}} v$
  • B
    $\sqrt{\frac{3}{7}} v$
  • C
    $\sqrt{\frac{5}{7}} v$
  • D
    $\sqrt{\frac{9}{7}} v$

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$A$ cylinder of mass $10 \; kg$ and radius $15 \; cm$ is rolling perfectly on a plane of inclination $30^{\circ}$. The coefficient of static friction $\mu_{S} = 0.25$.
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$(c)$ If the inclination $\theta$ of the plane is increased,at what value of $\theta$ does the cylinder begin to skid and not roll perfectly?

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$A$ loop rolls down on an inclined plane. The fraction of its total kinetic energy that is associated with the rotational motion is

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