316. Determine the values of the angles x and 6 so that the forces shown in Fig. P-316 will be in equilibrium. B Ans. a = 46.6°; 0 = 29° %3D A 317. The system of knotted cords shown in Fig. P-317 support the indicated weights. Compute the tensile force in each cord. Ana. A = 846 lb; B = 914 lb; C = 400 Ib; D = 207 lb 105° 90° 30° 30 %D %3D 75° %3D 300 lb 318. Three bars, hinged at A and D and pinned at B and C as shown in Fig. P-318, form a four-link mechanism. De- termine the value of P that will preyent Ans. P = 304 !b 400 lb motion. FIG. P-317.

316. Determine the values of the angles x and 6 so that the forces shown in Fig. P-316 will be in equilibrium. B Ans. a = 46.6°; 0 = 29° %3D A 317. The system of knotted cords shown in Fig. P-317 support the indicated weights. Compute the tensile force in each cord. Ana. A = 846 lb; B = 914 lb; C = 400 Ib; D = 207 lb 105° 90° 30° 30 %D %3D 75° %3D 300 lb 318. Three bars, hinged at A and D and pinned at B and C as shown in Fig. P-318, form a four-link mechanism. De- termine the value of P that will preyent Ans. P = 304 !b 400 lb motion. FIG. P-317.

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Concept explainers

System of Forces

A force is an external influence or agent that changes the state of a system. According to Newton's second law, the force applied to a body is proportional to the change in momentum of a body. Hence, whenever a force is applied to a body, its momentum changes. If the body is at rest, under the action of force, its state of rest changes to motion. In other words, the magnitude of the momentum of the body changes from zero to a measurable value. Similarly, if the body possesses some initial velocity, it has some associated momentum, the effect of force can cause the body to halt or come to rest, that is, the momentum reduces to zero.

Question

316. Determine the values of the angles
x and 6 so that the forces shown in Fig.
P-316 will be in equilibrium.
B
Ans. a = 46.6°; 0 = 29°
%3D
A
317. The system of knotted cords shown
in Fig. P-317 support the indieated weights.
Compute the tensile force in each cord.
Ana. A = 846 lb; B = 914 lb; C = 400
105°
90°
C
-30°
30
%3D
Ib; D = 207 lb
75°
%3D
300 lb
318. Three bars, hinged at A and D
and pinned at B and C as shown in Fig.
P-318, form a four-link mechanism. De-
termine the value of P that will preyent
400 lb
motion.
Ans. P = 304 !b
= 301
FiG. P-317.

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