Determine the force in member BD. (Member ABC is pinned at C to the ceiling; B is 450 mm directly below C and A is a further 120 mm below B, offset 135 mm to the left of the line CB; a 400 N vertical load acts at A. Member BD is pinned at B and at D on the ceiling, 240 mm to the right of C, so BD = 510 mm.) (answer in N)