Question

The coefficient of static friction between contact surfaces of two bodies is $0.5$. The contact surfaces of one body support the other till the inclination is less than(Approximately).

• A. ${30}^o$
• B. ${45}^o$
• C. ${60}^o$
• D. ${90}^o$

Answer 1

The correct option is A ${30}^o$

$\tan \theta =\mu$

$\theta ={\tan }^{-1}\left(H\right)$

$={\tan }^{-1}\left(0.5\right)\approx {30}^0$

Hence,

option $\left(A\right)$ is correct answer.