When a 10-newton object is suspended at rest by a string, the following are true:

* The tension in the string is 10 newtons. Since the object is at rest, the net force acting on it must be zero. This means the upward force from the string (tension) must equal the downward force of gravity (weight).

* The object is in equilibrium. Equilibrium means the object is not accelerating, and the forces acting on it are balanced.

Let me know if you'd like me to explain any of these concepts in more detail!