1-kg box is held at rest by two ropes that form 30 angles with the vertical. An external force F acts vertically downward on the box. The force...

A 5.1-kg box is held at rest by two ropes that form 30 angles with the vertical. An external force F acts vertically downward on the box. The force exerted by each of the two ropes is denoted by T. A force diagram, showing the four forces that act on the box in equilibrium, is shown in the figure. The magnitude of force F is 920 N. The magnitude of force T is what?