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3. 3D RIGID BODY Determine the support reactions at O (ball-and-socket) and the tensions in cables AB and AC. (Helpful Hints:

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ANSWER : A VTAL TAB 20kal 100 ox 18? y AB = 3i -5j-Gk LABI = √3² (=5²4 (-6/² = 70 AB 3i-5j-6k (AB 70 AC =-7i_5; -8K - TAB TAB ( 31-82 i 0 14-80 i=0 3TAB -STAD TTAC (138 STAC 1138 - 6 TAB - STAL To 1138 FO To TTAC-80i =0 STAB - STAC sto 138 ( STAB 170 1-30 -f) 111 () + +708 () +9 0 138 여O 5 II1 () +1-03 20109 - 0 5 ) 138 Oy = -10 kn 11-11 () +7.03 ( +220 일 = 18·2 kal R = (oi -105+

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