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# test2 - COE 2001 — Test 1 — Fall 2006 Name my Pb I(40...

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Unformatted text preview: COE 2001 — Test 1 — Fall 2006 Name: my Pb. I (40 pts) — Find a such that the tension in cable AC is a minimum and the system is in equilibrium. { Fab C. I: x V . \/‘ ___~_, x v '3wa 60° "is S;F)< " .. ‘A Nd ,Tg ruLéro + \$9 =0 Q) W:7TACD&0(_‘BCU360=& (2‘) C9,) -——x> TB —— TA (”‘0‘ “a?! .w G) A 390 - (A .: Cami +ouggo+a~v~0< ,_ ‘. X Al] eu. m (A wumuwuu. be do! -ﬁuo(+au€o+a3>o(=o Pb 11 (30 pts) — A small roof made of two identical rectangular plates (ABHG and BCIH), each weighing 60 lbs, is supported symmetrically as shown below. The plates are braced by three triangular plates (ABC, DEF, GHI) of the same density, material and thickness as the rectangular plates. 1. What is the total weight of the plates? 2. In the coordinate system shown below, ﬁnd the coordinates of J, A, I and C. 3. What can you say about the tension in cable ﬂ? 4. Calculate the tension in each of the four cables (JA, JG, J1 and JC) assuming them to have the same magnitude. Why can we make this assumption? 5. Could you solve the problem without this assumption? came) 2 .. cant 9/1, U/«to (be) (Mari 95 A9101}. : ' WM— : Qxéo +32<20r = H2 tbs 't .___y '\ A A “A 3A -3l-qr‘_5§L ___T A TA :T ____~T 2. A :__(3T+4\$+Yk IA 3+Cf’4-25'L Jé‘ﬁ ‘T; = -r 19.n- 31—43—‘8‘1 = 1427-43-21) 36 m?— \EH A A '- ’.‘ A A TU T12; -awyw) TC \19‘1 __.‘ —'—"5 ’_ A A A 3:731: \ Lin—Alj-gl'“) II \R? CS) No la/c. 3“» (’43 wadd‘l'" ‘MCQMY (A, uu‘wLoquC 5 “:13 gut/3 Pb. III (30 pts) - At the instant shown below, the wrench lies in a horizontal (xy) plane. Two 20—lb forces are applied to a ratchet wrench, down (into the paper) at A and up (out of the paper) at B, in an effort to loosen the bolt .25. Find the sum of the moments of the two forces about the axis (x) of the bolt. 20 lb into the paper Eugukn'm _ﬁ __, 51mech ' Zf=o Mowud'ﬁla {amp 1 ___ Ex F“ = F47; a ,\ / a Y / t .—~>K E, A20 A d. L J ...
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test2 - COE 2001 — Test 1 — Fall 2006 Name my Pb I(40...

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