2. The support assembly show is bolted in place at B, C, and D and supports a downward force of P at point A. The forces in members BA, CA, and DA are directed along the respective members (e.g. like a cable, but in compression). Knowing that the force in member BA is 29.2 lb, determine the magnitude of the force, P. (You must do all the work to find the unit vectors; the intermediate answers are given below so you can check them before you do the rest of the problem.) Hint: forces FBA, FCA and FDA push up on point A. Intermediate answers: -11î +9.6}+0k P 14.6 of + +9.6j–7.2k %3D 12 D +9.6î +9.6 j+4.8k 4.8 in. %3D 14.4 Ans: P =55.8 lb, FCA =18.3 Ib, FDA = 33 lb 9.6 in. %3D B 9.6 in. 7.2 in.
2. The support assembly show is bolted in place at B, C, and D and supports a downward force of P at point A. The forces in members BA, CA, and DA are directed along the respective members (e.g. like a cable, but in compression). Knowing that the force in member BA is 29.2 lb, determine the magnitude of the force, P. (You must do all the work to find the unit vectors; the intermediate answers are given below so you can check them before you do the rest of the problem.) Hint: forces FBA, FCA and FDA push up on point A. Intermediate answers: -11î +9.6}+0k P 14.6 of + +9.6j–7.2k %3D 12 D +9.6î +9.6 j+4.8k 4.8 in. %3D 14.4 Ans: P =55.8 lb, FCA =18.3 Ib, FDA = 33 lb 9.6 in. %3D B 9.6 in. 7.2 in.
Chapter9: Application Of Influence Lines
Section: Chapter Questions
Problem 11P
Related questions
Question
Use isometric paper for the 3D problem and use the format; given, find and solution to explain
Transcribed Image Text:2. The support assembly show is bolted in place at B, C, and D and supports a downward force of
P at point A. The forces in members BA, CA, and DA are directed along the respective members
(e.g. like a cable, but in compression). Knowing that the force in member BA is 29.2 lb,
determine the magnitude of the force, P. (You must do all the work to find the unit vectors; the
intermediate answers are given below so you can check them before you do the rest of the
problem.)
Hint: forces FBA, FCA and FDA push up on point A.
Intermediate answers:
-1lî +9.6ĵ+Ok
[P
14.6
Oî ++9.6ĵ –7.2k
12
D
+9.6î +9.6ĵ+4.8k
4.8 in.
えn=
DA
14.4
Ans: P 55.8 lb, FCA =18.3 lb,
FDA = 33 lb
9.6 in.
B
9.6 in.
7.2 in.
11 in.
LEGO
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