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ECS 221 Exam II

# ECS 221 Exam II - ENGINEERING MECHANICS-«STATICS EC3221...

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Unformatted text preview: ENGINEERING MECHANICS-«STATICS EC3221 FALL 2011 EXAM 2 October 14, 2011 Name St) I off} 0 m5 please print Signature SU Identification No. Recitation instructor Recitation Day Problem #1 Problem #2 Problem #3 Problem #4 TOTAL PROBLEM ONE A cabie AB exams a force at point A given by: {:IZOL—GOlek 1b a) Find the moment of force about point D. 1)) Find the moment of force if about the axis from C to D. \ A; "l 1 r' ..\.k r“: "‘ '“\ //1\(1 "if." /--<{ R‘ z N x x" / {j {a j :5“ z 1;{;!¥J~}1\ ,. \ ‘_ j\;\< 1‘) ..... u m ‘3; {D K} N3 PROBLEM TWO For the square plate shown in the ﬁgure ﬁnd: a) An equivalent force couple system at the origin. b) Locate the single force resultant, i.e., Find the equation ofthe line of action and ﬁnd the point where it intersects the Xmaxis Note: all forces act in the x—y plane and all couples Are directed normal to the plane. n we -' . t j} , 5 I‘ , r'g / \2 {If 1 ‘t u ‘72; E (‘3 r“; 23.! .. .\ I r ' D .,4 {/11 if, (:1; L7» WW} \ r l‘ -~ {are you. I“: f r I /l i , m -; , m (i 1:2 c: PROBLEM THREE Draw complete free body diagrams for the bodies indicated. Neglect friction. a. Rectangular plate of weight W. b. .Bar AB (light). PROBLEM FOUR a. Determine the reaction forces, in terms ofP and ﬂ, acting on the bar at supports A and D. Assume the System is frictionless and neglect the weight of the bait b. Extra credit (10 points; no partial credit): For what value ofﬂ will the bar no longer be in equilibrium? What happens when this is true? (“'V" t r ‘3}:\-»:\ \U ‘A f \ l/ ) ix x I“: ml in. l I") :3“ l / a x/ 3 i z x3 (so 5 f? 2': LR) M; t...» » 7 “\D ' W “ i} a {its l i "If in [[1 i z Cf) -. 1‘“. \w; l ;; it; J’- ’ z .1 A I ,/ ‘ 2‘ f :2 31:7 " f E I“ I: “AMI. + /« .rJ L l) ., / { \ 9 J f. l / ii” i 9 55 '1 V1 f3: " /. "" :3" .5; cf w ‘1 | g :- l r \rur ) (j: ‘x ‘“ iv” [I aw, \e \. K ‘-_M . 1 « F—‘\ i /‘» . : 2' H , k ,. a s”. ‘ w-g\ (7"1‘ \";;‘.:"“[l,.:f. (7": l r ' s- n r ﬂ 3 a (l ix"\ ‘ /J ' f, r” 'f” l 1\, \ ..!. a» , r ll are (with. 3?}; r Lear L {:3 .J' M 75:: ...
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ECS 221 Exam II - ENGINEERING MECHANICS-«STATICS EC3221...

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