test11 - ® COE 2001 — Test 3 — Fall 2006 Name: K91...

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Unformatted text preview: ® COE 2001 — Test 3 — Fall 2006 Name: K91 PLEASE NOTE: 1. If axes are specified for a given problem, you are to use them. Do not change them in any way or you get a 0 (zero) to that question. 2. Show all work. 3. Provide units with your answers, and box them. 4 If the “1b” unit is used in this test, it means “lb-force,” NOT “lb-mass” (i.e. do NOT multiply by gravity to get a force!). 5. Define clearly any new variable you introduce in a problem based on the givens. Pb_ I (35 pts) The cross section of a structural—steel angle is shown. Neglect the curved portlons and COIlSldeI‘ the section to be composed of two rectangles. With this assumption, compute the x— and y-coordinates to the centroid of the section. Compare your re— sults~ with the published values of X = 1.65 in. and Y = 2.65 in. for the actual angle section. 8" Pb II (65 pts) — The three flat blocks are positioned on the 30° incline as shown, and a force P parallel to the incline is applied to the middle block. The upper block is prevented from moving by a wire which attaches it to the fixed support. The coefficient of static friction for each of the three pairs of mating surfaces is shown. Determine the maximum value which P may have before any slipping'takes place. (6)4: MC: Lowxmé) 4L max : ((4%:qu Cg) “5 ic:4?2,6N <g-DOHQ ‘ ‘ W W (3:9 m T . “WC ‘//{La 10 @/ Cl XX /\V£ NR QNC @~:3£:T',£g,we%m10m. a) 8148‘: #-+‘£c-v?w(wg+(/JC) épr‘SO 3% :MC'NR —<(/3c3+03c,)w\§om A NC :. LOWER} ,4) :(C : ficwx : o,rNC:mO} (V (2) .9 9: (MIN @ .Luk 7 NW. Amwar: 'P;H7.01N Chg) Ofiw‘oucfl: cach mac XE c QB-vuax 3M WQ 4*: mum @ dfim‘F Wm; Idain 4&0 @2 Mg: megwao: 8774"“) % iempawe Wfig: P+wgm$ofi4g=26¢w> #9de 25927. 6N . 1 Arr I X z: ._ (.— 29x :90 'I (la-{ayesw Nova :13 an“ 3M?deng W‘digug OMLV ,———‘q '—5 g: A ...
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test11 - ® COE 2001 — Test 3 — Fall 2006 Name: K91...

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