Chapter 6, Problem 72P

The three bars are welded together to form a rigid unit that is supported by three slider bearings. Neglecting the weights of the bars, determine the magnitudes of the three bearing reactions caused by the 120-lbin. couple.

2. Determine the horizontal and vertical components of reaction which the pins exert on member AB of the frame. In other words, find the reactions at pins A and B. 300 lb 60° B 4 ft E -3 ft -3 ft 500 lb

The two couples act at the midpoints of bars AB and BD. Determine the components of the reactions and the magnitudes of the reactions at A, B and D. Neglect the weights of the members. Draw an FBD of the system as a whole and an FBD of the bar AB, in which you assume the direction of all forces at all pin connections in the positive x and positive y directions for consistency with the options in the questions. Which one of the following equations is NOT one of the equilibrium equations following from the two FBD's?

Calculate the forces in members AB, BG, and GF. Solve for each force from an equilibrium equation which contains that force as the only unknown. 6 kN 2.4 m B 2.4 m C 2.4 m D 2 m 5 m H.

The frameshown is supported by a hinge at A and a rocker at D. The frame is acted by the force system shown. Determine the components of the support reactions.

The 80-lb homogeneous plate is supported by a ball-and-socket joint at A, a slider hearing at B, and the cable CE. A 120-lb vertical force is applied to the corner D. Determine the force in the cable and the magnitude of the bearing reaction at B.

(a) Find the forces in members CE, CF, and DF. (b) Identify all the zero -force members.

The homogeneous 20-kg door is held in the horizontal plane by a thrust hinge at O, a hinge at A, and the vertical prop BC. Determine all forces acting on the door.

The figure shows a three-pin arch. Determine the horizontal component of the pin reaction at A caused by the applied force P.