4-53 The supporting structure of the billboard is attached to the ground by a pin at B, and its rear leg rests on the ground at A. Friction may be neglected. Point G is the center of gravity of the billboard and structure, which together weigh 2800 lb. To prevent tipping over in high winds, a 2370-lb weight is placed on the structure near A, as shown. (a) Compute the magnitudes of the reactions at A and B if the wind load on the billboard is q = 120 lb/ft. (b) Find the smallest wind load q that would cause the structure to tip over.

4-53 The supporting structure of the billboard is attached to the ground by a pin at B, and its rear leg rests on the ground at A. Friction may be neglected. Point G is the center of gravity of the billboard and structure, which together weigh 2800 lb. To prevent tipping over in high winds, a 2370-lb weight is placed on the structure near A, as shown. (a) Compute the magnitudes of the reactions at A and B if the wind load on the billboard is q = 120 lb/ft. (b) Find the smallest wind load q that would cause the structure to tip over.

International Edition---engineering Mechanics: Statics, 4th Edition

4th Edition

ISBN:9781305501607

Author:Andrew Pytel And Jaan Kiusalaas

Publisher:Andrew Pytel And Jaan Kiusalaas

Chapter7: Dry Friction

Section: Chapter Questions

Problem 7.38P: Two concrete blocks weighing 320 lb each form part of the retaining wall of a swimming pool. Will...

See similar textbooks

Similar questions

Two concrete blocks weighing 320 lb each form part of the retaining wall of a swimming pool. Will the blocks be in equilibrium when the pool is filled and the water exerts the line loading shown?
For the pin-connected frame shown, a = 10 in, b = 7.5 in, and F = 100 lb. Find the magnitude of the support reaction at Point A.
4.108 - A 2250 N marquee, 2,4 x 3 m, is held in a horizontal position bytwo horizontal hinges at A and B and by a cable CD attached to a point D located 1,5m directly above B. Determine the tension in the cable and the components of the reactions at the hinges.
The spanner shown is used to rotate a shaft. A pin fits in a hole at A , while a flat, frictionless surface rests against the shaft at B . If a 60-lb force P is exerted on the spanner at D , find the reactions at A and B.
A truck-mounted crane is used to lift a 700 lb. compressor. The weights of the boom AB and of the truck are as shown, and the angle the boom forms with the horizontal is ⍺ = 50°. Determine the reaction at each of the two (a) rear wheels C, (b) front wheels D.
A 12-ft wooden beam weighing 80 lb is supported by a pin and bracket at A and by cable BC . Find the reaction at A and the tension in the cable.
The homogeneous bar shown weighs 160 N. Determine the reactions at B, C, and D.
A 39-ft length of railroad rail of weight 44 lb/ft is lifted by the tongs shown. Determine the forces exerted at D and F on tong BCF.
Rod AD is acted upon by a vertical force P at end A and by two equal and opposite horizontal forces of magnitude Q at points B and C . Derive an expression for the magnitude Q of the horizontal forces required for equilibrium.
4. The block shown is acted on by its weight W=400 lb, a horizontal F=600 lb, and the pressure P exerted by the inclined plane. The resultant R of these forces is parallel to the incline. Determine the values of P and R.
A Beam is supported by a pin at A and cable BC at B. The vertical component of force reaction at pin A is
A 39-ft length of railroad rail of weight 44 lb/ft is lifted by the tongs shown. Determine the forces exerted at D and F on tong BDF.