Review 3 - Review 3 ’7-120. Express the shear and moment...

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Unformatted text preview: Review 3 ’7-120. Express the shear and moment acting in the pipe as a function of y, where 0 s y s 4 ft. +T):F,=o; 16-4y—V=0 V={16—4y}lb Am (+2M=o; M+4y(§) +40—16y=0 M: {—zyz + 16y—40}1b.ft Ans 7-121. Determine the normal force, shear force, and ma- ment at points B and C of the beam. 7:5 kN )i! v' 6kN Free body Diagram: The Suppun reactions need not be computed fnr his case. lnlenml Forces: Applying the equations of equilibrium [0 segment DC [FED (n)], we have 32520; - Nc=0 Ans +TEF,.=0; Vc—3.00—6=0 vc=9.oom Ans {+2Mc=o; —Mc-3.00(l.5)—6(3)—40=0 Mc=—62.5 kN'-m Ans Applying III: equations of equilibrium to segment DB [FBD (b)}. we have —> SE. = 0; N, = 0 Ans +7 2F, :0; v, — 10.0—7.5—4.oo—6=o v5 = 27.5 kN Ans (+21% = o; —M,, — 10.005) — 75(5) 4.00m — 6(9) — 40 = 0 My 2 —184.5 kN-m Ans l(3)=3.0kN 6kN )5 m 1.5m fikN 2 40mm 2.5m 25m 2m 2m (b) 7-172. A chain is suspended between points at the same elevation and spaced 3 distance of 60 ft apart. If it has a weight of 0.5 mm and the sag is 3 ft, determine the maximum tension in the chain. dr _1 2 {1+}12(w0ds)1} Performing the integration yields : F _ 1 f{smh ‘[F(o.5s+ c1)]+cl} [1] H From Eq. 7-13 At —0- dy—o 11 C—0 5—, d—x— ence 1- dy 0.53 .__. = tang = _ [2] dx 5: Applying boundary conditions at x = 0; .r = 0 to Eq.[1] and using the result C1 = 0 yields C = 0. Hence )3}, . 0.5 s = -—~ smh —x [3] 0.5 F” Substituting Eq.[3] into [2] yields : dy .nh 0.5.1: [4] _.. = s, __ dx F” Performing the integration F 0.5 y = ficosh[FHx)+ C3 F Applying boundary conditions at x = 0; y = 0 yields C3 = 731% . Therefore _F,, has 1 y"0.5 cos th— F 0.5 Atx=30ft; y=3ft 3=—” cosh —(30) —1 .5 F" By trial and error F” = 75.251b At 1 = 30 ft; 6: 9m“. From Eq.[4] dy 0.5(30) tanGmu = — = ' 9 a, =1L346° dx x=30ft S! ( 75.25 J "' F 75.25 I“, = H = 76.7113. Ans cos 6,”, = cos_11.346° 7-123. Draw the shear and moment diagrams for the beam. 9-54. The gravity wall is made of concrete. Determine the location (2 y) of the center of gravity G for the wall. 222A = 1.8(3.6)(0.4) + 2.1(3)<3) — 3.4G)(3)(0.6) — 1.2(%)(1.3)(3) = 15.192 m3 2}}! = 0.2(3.6)(O.4) + 1.9(3)(3) — 1.4G)(3)(0.6) - 2.4G)(1.8)(3) : 9648 m3 24 = 3.6(0.4) + 3(3) — game) — gum) = 6.84m E = 244 = 15192 = 2,2211: Ans IA 634 - 2' . yzfl =2fl§ =1,41m Ans VON) M m "5" -7 s MUN'M} I-S'b x0") -m '59 l 0.4 111 *9-60. The wooden table is made from a square board having a weight of 15 lb. Each of the legs weighs 2 lb and is 3 ft long, Determine how high its center of gravity is from the floonAlso. what is the angle, mEasured from the horizontal, through which its lop surface can he tilted on two of its legs before it begins to overturn? Neglect the thickness of each leg. i = 25W = _._——15(3) + 4mm” = 2.48 ft Ans EW 15 + 4(2) e — tan—Ki) : 38.9” Ans _ 2.43 10-25. The polar moment of inertia of the area is .7C = .V' .V 28 in4 about the z axis passing through the centroid C. The moment of inertia about the x axis is 17 in‘. and the moment of inertia about the y’ axis is 56 in4. Determine the areaA. Jc = zsm‘ = I, +1, ] 28=i7+1, [ .C X [y =iiin“ : I=7+Adz 53in;- 56:11+A(3)2 , y y A = 5.00 m2 Ans . . 10-49. Determine the moments of inertia of the triangular area about the x' and y’ axes. which pass through the centroid C of the area. L :3%(a)h3+31—6(b—a)h3 =39»? Ans __ 2,24 _ §a[;(h)(a)]+[a+ b+“][%h(b—a)] _ b+_a X_ 2A _ %(h)(a)+%h(b-a) 3 _ a _.|' 1; #ij+%'w(%-§a)2+%h(b~a)3+%h(b-a>(a+‘?-9¥)Z i—— »——J ll ;—6hb(b1—ab+a2) Ans ...
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Review 3 - Review 3 ’7-120. Express the shear and moment...

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