midterm ans

# midterm ans - 0 Tbs sand 0n the tray as shown in the...

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Unformatted text preview: 0.} Tbs sand 0n the tray? as shown in the ﬁgure below can be treated as a. triangular distributed load with :21 maximum intensity 01’800 N/m. Assume that the Whﬁﬁi at C is frictiunicss. (i) Draw ﬁ‘ﬁte body diagrams for the entirs Structure and truss ABC. (ii) Detsrmins all forces acting on truss ABC. r” " "at f if {ﬂux} 5H: . l ' i Q5 E * W — 2(800)(1} w 400 N E 5;“ 3/ ﬁfTE ”\ Mr .sw" fdi+ ﬁg; From a free—body diagram for if} the complete structure: EMA = 0 ass 50” (4) * 400(4 tan 30”) = 0 xj§s C = salts H II “ sf“ From a freeﬁbody diagram 0f member ABC: Member ED is a two~f0rce member: EMA = 3(2) + 461:9 cos BOQ (4) z 0 B = ~461u9 s g 462 N ENE Er = A_ + (—461n9) + salts ass 600 : 0 Ex; g X 3-: ‘ MM” Er Er = A' + seius sin 60” = 0 3" 3" A3 = 231¢0 N : 231ﬂ0 s A? = ”400 s = A = (Ax}2 + (Ay)2 : {(23143)2 + {—400}2 x 451.9 N f 5: ...
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