Final answer:
The force in member BC is 3.0 x 10^6 N and it is in tension.
Step-by-step explanation:
To determine the force in member BC, we need to consider the equilibrium of forces acting on the object. If the net force on an object is zero, then the object is in equilibrium. In this case, the force in member BC is equal to the force in member AB, which is 3.0 x 10^6 N. Therefore, the force in member BC is also 3.0 x 10^6 N.
The member BC is in tension because the force in member BC is directed away from the object and causes it to elongate.