Which of the following sets of concurrent forces may be in equilibrium?

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?

$A$ 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.

$A$ mass $M \text{ kg}$ is suspended by a weightless string. The horizontal force required to hold the mass at $60^{\circ}$ with the vertical is

There are four forces acting at a point $P$ produced by strings as shown in the figure. Point $P$ is at rest. The forces $F_1$ and $F_2$ are respectively:

$A$ flexible chain of weight $W$ hangs between two fixed points $A$ and $B$ which are at the same horizontal level. The inclination of the chain with the horizontal at both the points of support is $\theta$. What is the tension of the chain at the mid point?