A block of mass $m$ rests on a rough inclined plane. The coefficient of friction between the surface and the block is $\mu$. At what angle of inclination $\theta$ of the plane to the horizontal will the block just start to slide down the plane?
A block of mass $m$ rests on a rough inclined plane. The coefficient of friction between the surface and the block is $\mu$. At what angle of inclination $\theta$ of the plane to the horizontal will the block just start to slide down the plane?
- A
$\theta = \tan^{-1} \,\mu$
- B
$\theta = \cos^{-1} \,\mu$
- C
$\theta = \sin^{-1} \,\mu$
- D
$\theta = \sec^{-1} \,\mu$
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