Question

Find out the mass of block $B$ to keep the system at res : ($g=10m/s^2$)

Answer 1

$a)$ The system is at rest.

$T=m_{A}g=5\times g=50N$

For B

$T=m_B\sin 30°50=m_B\left(\frac{1}{2}\right)m_B=100kg$

$b)$

At point A

$T=100N$

For B

$T=m_{B}g{m}_B=\frac{T}{g}=10kg$