Two blocks of  $7\,\,kg$ and $5\,\,kg$  are connected by a heavy rope of mass $4\,\,kg.$ An upward force of $200\,N$  is applied as shown in the diagram. The tension at the top of heavy rope at point $P$  is ....... $N$ $(g = 10\,\,m/s^2)$

A uniform rope of mass $1.0\, kg$ is connected with a box of mass $2.0\, kg$, which is  placed on a smooth horizontal surface. The free end of the rope is pulled horizontally by a  force $6\, N$. Find the tension at the midpoint of the rope. ............ $N$

For frictionless surfaces in given arrangement tension $T_2$ is :-

In which of the following cases is the contact force between $A$ and $B$ maximum $(m_A = m_B = 1 kg)$

Three masses of $16, 8$ and $4\,kg$ are placed in contact as shown in figure. If a force of $140\,N$ is applied on $4\,kg$ mass, then the force on $16\,kg$ will be  ............ $ N$

For the given figure what will be the contact force applied by $6\ kg$ block on $4\ kg$ block ............ $N$