Four blocks are connected as shown in the fig. on a horizontal frictionless surface of $m_1 = m_2 = m_3 = m_4$ then $T_3/T_4$ will be

Three blocks with masses $m, 2m $ and $3 m$ are connected by strings, as shown in the figure. After an upward force $F$ is applied on block $m,$ the masses move upward at constant speed $v.$ What is the net force on the block of mass $2\ m\ ?\, (g$ is the acceleration due to gravity$)$

Three blocks of masses $3\, kg, 2\, kg$ and $1\, kg$ are placed side by side on a smooth  surface as shown in figure. A horizontal force of $12\,N$ is applied to $3\, kg$ block. The  net force on $2\, kg$ block is ............ $N$

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. ............ $N$

A frictionless cart $A$ of mass $100\  kg$ carries other two frictionless carts $B$ and $C$ having masses $8\  kg$ and $4\  kg$ respectively connected by a string passing over a pulley as shown in the figure. What horizontal force $F$ must be applied on the cart so that smaller cart do not move relative to  it .......... $N$

Two masses $M_1$ and $M_2$ are accelerated uniformly on a frictionless surface as shown in figure. The ratio of the tensions $T_1/T_2$ is