A Store's Sign Has a Mass of 20 Kg and Is

Multiple Choice

A store's sign has a mass of 20 kg and is 3.0 m long.It is uniform,so its center of gravity is at the center of the sign.It is supported horizontally by a small loose bolt attached to the wall at one end and by a wire at the other end,as shown in the figure.What is the magnitude of the net force that the bolt exerts on the sign?

A) 460 N
B) 230 N
C) 200 N
D) 120 N
E) 300 N