A rod of uniform composition with a length of $30\,\text{cm}$ and a weight of $5.2\,\text{N}$ is fixed to a wall by a hinge at one end. Its far end is held up by a wire, so that the rod stays horizontal and in equilibrium. The wire makes an angle of $40^\circ$ to the horizontal. Calculate the tension in the wire.
- A$3.4\,\text{N}$
- B$4.0\,\text{N}$
- C$6.8\,\text{N}$
- D$8.1\,\text{N}$