$A$ body under the action of several forces will have zero acceleration:

$A$ small sphere is hung by a string fixed to a wall as shown in the figure. The sphere is pushed from the wall by a stick. The forces acting on the sphere are as shown. Then,identify the incorrect expression.

For the free body diagram shown in the figure,four forces are applied in the $x$ and $y$ directions. What additional force must be applied and at what angle with the positive $x$-axis so that the net acceleration of the body is zero?

Two equal heavy spheres,each of radius $r$,are in equilibrium within a smooth cup of radius $3r$. The ratio of the reaction between the cup and one sphere to that between the two spheres is:

$A$ block of weight $W$ is suspended by a string and pulled by two horizontal forces $\overline{F}_1$ and $\overline{F}_2$ such that the string makes an angle of $45^{\circ}$ with the vertical. If the tension in the string is $60\,N$, find the magnitude of the horizontal forces $\overline{F}_1$ and $\overline{F}_2$ (assuming they are equal) and the weight $W$ of the block.

In the arrangement as shown,tension $T_2$ is ......... $N$ $\left(g=10\,m/s^2\right)$