# A uniform sphere of radius R and mass M is held at rest on an inclined plane of angle $\theta$ by a horizontal string , as shown in the figure. Let $R= 20 \;cm,M= 3\;kg,$ and $\theta= 30^{\circ}$. What is the normal force exerted on the sphere by the inclined plane ?
$\begin{array}{1 1}3.76\;N\\36\;N\\29.4\;N \\46\;N\end{array}$