# Solucionario de Mecanica vectorial para ingenieros Beer Johnston Cap5 10-estatica

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- 1.PROBLEM 6.1 Using the method of joints, determine the force in each member of the truss shown. State whether each member is in tension or compression.SOLUTION AB = 32 + 1.252 = 3.25 m BC = 32 + 42 = 5 mReactions: ΣM A = 0: (84 kN)(3 m) − C (5.25 m) = 0C = 48 kN ΣFx = 0: Ax − C = 0 A x = 48 kNΣFy = 0: Ay = 84 kN = 0 A y = 84 kNJoint A: ΣFx = 0: 48 kN −12 FAB = 0 13 FAB = +52 kNΣFy = 0: 84 kN −FAB = 52 kN T W5 (52 kN) − FAC = 0 13 FAC = +64.0 kNFAC = 64.0 kN T WJoint C:FBC 48 kN = 5 3FBC = 80.0 kN C WPROPRIETARY MATERIAL. © 2010 The McGraw-Hill Companies, Inc. All rights reserved. No part of this Manual may be displayed, reproduced or distributed in any form or by any means, without the prior written permission of the publisher, or used beyond the limited distribution to teachers and educators permitted by McGraw-Hill for their individual course preparation. If you are a student using this Manual, you are using it without permission. 737