Prob 7. Determine the force in the member BC for the below truss. 2 kN F 3 kN 3 kN 30° 30° E 60° 60° A=0 A 30° 30° 60° 60° 30° 30° D B C 4 m 4 m 4 m Ay = 4 kN D₁ = 4 kN