(Solved): The rigid metal strip of negligible weight is used as part of an electromagnetic switch. The stiffn ...

The rigid metal strip of negligible weight is used as part of an electromagnetic switch. The stiffness of the springs at $A$ and $B$ is $k=7\mathrm{N}/\mathrm{m}$ and the strip is originally Determine the smallest force $F$ needed to close the contact gap at $C$. horizontal when the springs are unstretched. Express your answer to three significant figures and include the appropriate units.