Shelf XY is $0.40\,\text{m}$ in length and is fixed to a wall at end X. A wire, as shown, is attached to Y and to the wall to hold it horizontal. The wire carries a tension force of $15\,\text{N}$ at an angle of $30^{\circ}$ to the horizontal. What is the moment of this force about point X?
- A$3.0\,\text{N m}$
- B$5.2\,\text{N m}$
- C$6.9\,\text{N m}$
- D$12\,\text{N m}$