Find the force on one face of a right triangle of side AB = 4 ft. and AC = 3 ft. submerged with AC vertical and AB in the surface.

Express the force as a Cartesian vector.

A hiker start from his parked car and walked as follows : 12km due east followed by 8km at 40 north of east , followed by 10km due . Find the components ( along east and north of the net displacement and the magnitude and direction of the displacement

Determine the force in each member of the Gambrel roof truss shown. State whether each member is in tension or compression. Use Method of Sections. The answers are AB = 5 kN C, AC = 4 kN T, BC = 0, CE = 4 kN T, BE = 0.2 kN C, BD = 4 kN C, FH = 5 kN C, HG = 4 kN T, EG = 4 kN T, FG = 0, DF = 4 kN C, EF = 0.2 kN C, DE = 0.24 kN T