HW 7 Prob 3_26 extra-1 - 5’ PROBLEM 3.26 A small boat...

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Unformatted text preview: 5’ PROBLEM 3.26 A small boat hangs from two davits, one of which is shown in the figure. The tension in line ABAD is 82 1b. Determine the moment about C of the resultant force RA exerted on the davit at A. SOLUTION Wehave ‘ RA=2FAB+FAD where F AB = —(82 1b) j E 6i — 7.75 j — 3k and F =F ——= 82113—— AD AD AD ( ) 10.25 F AD = (48 1b)i - (62 1b) j — (24 1b)k Thus R A = 2F A3 + F AD = (48 1b)i — (226 1b) j - (24 1b)k Also rA/C = (7.75 ft)j + (3 ft)k i j k Using Eq. (3.21): MC = O 7.75 3 48 ~26 —24 = (492 1b-ft)i+(1441b-ft)j—(3721b-ft)k Mc =(4921bhft)i+(144.0 lb-ft)j~(3721b'fi)k ‘ ‘—_——_———______—__—__J ...
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