Part A

As shown, a truss is loaded by the forces $P_1=509lb$ and $P_2=201lb$ and has the dimension $a=10\mathrm{.}9ft.$

Determine $F_{BC},$ the magnitude of the force in member $BC,$ using the method of sections. Assume for your calculations that each member is in tension, and include in your response the sign of each force that you obtain by applying this assumption.

Express your answer numerically in pounds to three significant figures.

View Available Hint$($s$)$

$F_{BC}=$ lbs