Physics - NLM Question with Solution | TestHub

(P) ${\mu }_1=0.8>\tan 37^{\circ }=0.75$: friction alone holds $m_1$, but $m_2$ slides (${\mu }_2=0$), string tightens - tension non-zero, $m_1$ stays - P$\to 2,5$.

(Q) ${\mu }_2=1.5>\tan 53^{\circ }=1.33$ holds $m_2$; $m_1$ slides (${\mu }_1=0$), string tightens - tension non-zero, $m_1$ stays put on its side - Q$\to 2,5$.

(R) ${\mu }_1=0.01$: both slide; $m_{2}g\sin 53^{\circ }>m_{1}g\sin 37^{\circ }$, so $m_2$ pulls $m_1$ up - tension non-zero, $m_1$ moves up - R$\to 2,3$.

(S) ${\mu }_1={\mu }_2=0$: same imbalance, $m_1$ moves up - S$\to 2,3$.

Hence option (A).