Problem 6.57 Part A The space truss is supported by a bal-and-socket joint at D
ID: 1843410 • Letter: P
Question
Problem 6.57 Part A The space truss is supported by a bal-and-socket joint at D and short links at C and E Take Fi(-570 k lb and F (480J)b. Fiaure 1) Delenmine the force in member BF of the truss, and state if the member is in tension or compression. Expross your answor to three significant figures and include the appropriate units. Assume positive soalars for members in tonsion and negative scalars for members in compression. ABF= 01h Submit MyAnswer Give Up Correct Part B Determine the force in member BC of t,o tru and state if the member is in tension or compression. Express your answer to three significant figures and include the appropriate units. Assume positive scalars for members in tension and negative scalars for members in compression. My Answers Give Up Correct Part C Determine the force in member BE of the truss, and state if the member is in tension ar compression. Express your answer to three significant figures and include the appropriate units. Assume positive scalars for members in tension and negative scalars for members in compression My Answers Give Up Correct Fgure of Figure Part D Detenmine the force in member AB of the truss and stao if the member is in tension ar compression. Express your answer to three significant figures and include the appropriate units. Assurme positive scalars for members in tension and negative scalars for members in compression. MyAnswer Give Up CorrectExplanation / Answer
the method of joints. this method uses the free body diagram of joints in the struture to determine the forces in each member . for example , in the above structure we have 5 joints each having a free body diagram
for each oit one can write two equations . the moment equation is trivially satisfied since all forces on a joint pass through the joint. for example for the above truss above example there are 7 unknon forces plus three support reactions giving totally 1 unknown equations obtained from equilibrium.