Three forces are acting on a modern streetlamp at points A, B, and C. a. Express the three forces acting at points A, B, and C as Cartesian force vectors in Sl units. b. Compute the resultant force vector written as a Cartesian force vector. c. Compute the magnitude of the resultant force vector you found in part (d). d. Convert your answer in part (d) to the US customary system of units (FPS). 650 N (2.4 m 2.4 m B 8 m 2.4 m A 12 kN y 45 x 8 kN