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Unformatted text preview: ENGR 2301 Nam e: W 728 Mew There are a total 01100 points on the exam. Each of the ﬁve problems is worth 20 points. Show all of your work (diagrams, equnﬁons, calculations, em).
Report each answer'with the correct units. Date: 1.) Determine the spring constant, k, for equilibrium of this system. Neglect the
thickness of the beams. ‘  o Each beam has
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(“5% : 0,5n7 sin g i "'T ks ——— kOm 17.5mm.)
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’/000N(/'m Case/9g) I O 3 +1<(/[00 m2) 51m €00 — 490.5 NMCoséédé/aoo/UW 50540 2.) Determine the minimum force, P, for impending motion. Describe the" nature of
the motion. Neglect the thickness of the beam. Neglect the size and mass of the
wedge. [5mm is 50/43 “m mass _ ~ 1 F 'l P r‘
‘ *nge i ' Wedge cui’JWPewoimg mO'l‘Ld‘ax. Bean‘ag‘ra‘iuma xi Fe =24; M3 = 0.300% ZMA30
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m ﬂoothlﬁN)?’ 49W / Fa :r "ILL! {\i Two identical bars are connected with a fr
the floor with a smoeth frictionless pin at frictionless roller at C, and a spring. The Spring is uncompressed when theta, 9, is equal to 90“. The system is allowed to come to equilibrium (spring under
compression). ictionless pin at B. Bar AB is pinned to
A. Bar BC is connected to both :1 Determine the angle theta, B, for equilibrium. __......____.—..*W.s. ){5 :7 2 (ZﬂOm) 005 5’} 5,74,: : ~ 900m '5!th 50!: 26,50,437 i’a‘bé’ $69(29’7,2N)’ I: (é,00m51}79}5[) :0
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wig—éf Two identical bars are connected with a frictionless pin at B. Bar AB is pinned to
the ﬂoor with a smooth frictionless pin ntA. Bar BC is connected to both a frictionless roller at C, and a spring. The spring is uncompressed when theta, 9, is equal to 90". The system is allowed to come to equilibrium (spring under
compression). Determine the angle theta, B, for equilibrium. EN GR 23 01  No me:
Exam 3 Date: a 10!] points total oilexam. a Work on blank sheets provided with exam. a Show your work to receive full. creclit (freebody—diagram, equations,
calculations, etc.) ' '0 Show proper units with your calculations end on your fingil answers. 9 Attempt ever}r problem. 0 Clearly box or underline your fiu :1] answers. (30 points)
The following is a crosssection of weather stripping for a storm door. The circular
region in the cenier is void space (a hole). The bottom center of the object is the origin (3: and y axes shoWn).
:1.) Determine the moment of inertia about the X axis shown. (15 points) h.) Determine the moment of inertia shoot the y axis showu. (15 points) . RLES mm u 35m 33 + foogaﬁﬁﬁoavi “Ema 3395an I 33% Espvm$80fvmw in +9 a l Ea .1... NWOL Ei ENGR 23 01  Nome:
Exam 3 Date: 100 points total on exam.
a Work on blank sheets provided with exam.
« Show your work to receive full credit (ﬁee—body—diagram, equations,
calculations, etc.) '
‘0 Show proper units with your calculations and on your fingl answers. a Attempt every problem. _
9 Clearly box or underline your final answers. (36 points)
The following is a crosssection of weather shipping for a storm door. The circular
region in the center is void space (a hole). The bottom center of the object is the origin (3: and y axes shown).
a.) Determine the'moment of inertia about thex axis shown. (15 points) 1).) Determine the moment of inertia alient the y axis shown. (15 points) I R135 mm 3.50 mm REED mm I . 4.) A lightweight umbrella design was have the following crosssection. Determine the centroid of crosssection. Determine the moment of inertia about a horizontal axisthrou h the centroid of the '
crosssection (that is, an x' axis). 13,: ‘ ‘ ‘  . ' t W ._c ‘31 I . 4.) A lightweight umbrella design was proposed. The support arms for the umbrella ‘ have the following crosssection. Determine the centroid of cross—section. Determine the moment of inertia about a horizontal axis through the centroid of the ‘ crosssection (that is, an x' axis). Notethat the x' axis is NOT shown in the diagram
below. ‘ “MM—Wm“ ...
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This note was uploaded on 04/18/2010 for the course ENGR 2312 taught by Professor Pressly during the Fall '09 term at Northwest.
 Fall '09
 Pressly
 Statics

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