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HW_10 - Problem 3.120(a Have R = F = FF FE(1.1 lb where FF...

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Problem 3.120: (a) Have F E R F F F = ∑ = + (1.1) where ( ) ( ) F F 10 sin60 j cos60 k 8.6603 j 5.0k ( lb ) = + = + D D (1.2) ( ) E F 5k lb = − (1.3) Thus ( ) R 8.66 j lb = (1.4) Have ( ) ( ) R C F / C F E / C E F / C E / C R C M r F r F r r 9i 4 j r 18i 13 j i j k i j k M 9 4 0 18 13 0 0 8.6603 5 0 0 5 45i 45 j 77.9k lb in = × = × + × = = = + = + + F (1.5) (b) To determine which direction duct section CD has a tendency to turn, have
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