Chapter 3, Problem 13P

Show that all diagonal members of the truss carry the same force, and find the magnitude of this force.

The force F=5i+12j+4k lb is applied to the handle of the door. Determine the orthogonal component of F that is perpendicular to the plane of the door.

The homogeneous bar AB weighs 25 lb. Determine the magnitudes of the forces acting on the bar at A and B. Neglect friction.

The pulley-cable system supports the 150-lb weight. The weights of the pulleys and the horizontal bar ABC are negligible. Determine the cable tensions at A and C and the distance x.

The two forces are applied to the end of the boom OA. Determine the force F so that the resultant of the two forces lies in the yz-plane.

Find the forces in the three cable segments and the angles 1,2, and 3.

The supporting structure of the billboard is attached to the ground by a pin at B, and a roller at A. Point G is the center of gravity of the billboard and structure, which together has a weight of 1400 N. To prevent tipping over in high winds, a 1200-kg mass is placed on the structure near A, as shown. Compute the magnitudes of the reactions at A and B if the wind load on the billboard is q = 1200 N/m.

Two blocks hanging vertically are connected by a heavy uniform rope of mass 3 kg . The blocks are pulled by an upward force of 300 N . Determine the tension at the top and midpoint of the heavy rope in N . The mass of the upper block is 6 kg while the lower box has a mass of 8 kg .

The suspended cylinder has a mass of 95 kg. Determine the x and y components of the reaction at pin B on BC using scalar notation. Determine the x and y components of the force at pin C using scalar notation.