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الكلية كلية هندسة المواد
القسم قسم هندسة المعادن
المرحلة 1
أستاذ المادة باسم محيسن محمد الزبيدي
1/12/2012 1:25:49 PM
2.52 A force of 500 lb ,directed along the axis of the boom from A to O
2.56 A precast concrete wall section is temporarily held by the cables shown. If the tension in cable AB is 700 lb, determine the components of the force exerted on the wall section at A.
2.62 A precast concrete wall section is temporarily held by the cables shown. If the tension in cable AB is 700 lb and the tension in cable BC is 900 lb , determine the components of the resultant of the forces exerted by the cables on point B.
A ( 0 , 0 , 16 )
B ( 12 , 0 , 12 )
C ( 0 , 16 , 0 )
Force
(lb) Distance Components Distance
Force Components
dx dy dz
TAB= 700
= 14
TBC= 900
= 18
2.64 Knowing that the tension in AC is 7,000 lb , determine the required values of the tension in AB and AD so that the resultant of the three forces applied at A is vertical .
A ( 0 , 60 , 0 ) ; B ( 20 , 0 , 15 )
C ( 20 , 0 , -30 ) ; D( -45 , 0 , 0 )
Force
(lb) Distance Components Distance
Force Components
dx dy dz
TAB
= 65
TAC=
7000
= 70
TAD
= 75
From (1)
From (2)
2.70 A 50-lb load is supported by three ropes which are attached to a ceiling as shown. Determine the tension in each rope.
A ( 8 , 0 , 0 ) ; B ( 0 , 0 , 0 )
C ( 0 , 0 , 6 ) ; D ( 4 , -6 , 2 )
Force
(lb) Distance Components Distance
Force Components
dx dy dz
TAD
= 7.4833
TBD
= 7.4833
TCD
= 8.246
50 - - - - - -50 -
2.75 A 20-lb instrument is hung inside a box by means of three strings. If the instrument hangs directly in the center of the box and the strings are tied together at a point D, 3 in. below the top of the box, determine the tension in each sting.
A ( -8 , 0 , 10 ) ; B ( 0 , 0 , -10 )
C ( 8 , 0 , 10 ) ; D ( 0 , -3 , 0 )
Force
(lb) Distance Components Distance
Force Components
dx dy dz
TAD
= 13.1529
TBD
= 10.44
TCD
= 13.1529
W - - - - - -20 -
2.52 A force of 500 lb ,directed along the axis of the boom from A to O
2.56 A precast concrete wall section is temporarily held by the cables shown. If the tension in cable AB is 700 lb, determine the components of the force exerted on the wall section at A.
2.62 A precast concrete wall section is temporarily held by the cables shown. If the tension in cable AB is 700 lb and the tension in cable BC is 900 lb , determine the components of the resultant of the forces exerted by the cables on point B.
A ( 0 , 0 , 16 )
B ( 12 , 0 , 12 )
C ( 0 , 16 , 0 )
Force
(lb) Distance Components Distance
Force Components
dx dy dz
TAB= 700
= 14
TBC= 900
= 18
2.64 Knowing that the tension in AC is 7,000 lb , determine the required values of the tension in AB and AD so that the resultant of the three forces applied at A is vertical .
A ( 0 , 60 , 0 ) ; B ( 20 , 0 , 15 )
C ( 20 , 0 , -30 ) ; D( -45 , 0 , 0 )
Force
(lb) Distance Components Distance
Force Components
dx dy dz
TAB
= 65
TAC=
7000
= 70
TAD
= 75
From (1)
From (2)
2.70 A 50-lb load is supported by three ropes which are attached to a ceiling as shown. Determine the tension in each rope.
A ( 8 , 0 , 0 ) ; B ( 0 , 0 , 0 )
C ( 0 , 0 , 6 ) ; D ( 4 , -6 , 2 )
Force
(lb) Distance Components Distance
Force Components
dx dy dz
TAD
= 7.4833
TBD
= 7.4833
TCD
= 8.246
50 - - - - - -50 -
2.75 A 20-lb instrument is hung inside a box by means of three strings. If the instrument hangs directly in the center of the box and the strings are tied together at a point D, 3 in. below the top of the box, determine the tension in each sting.
A ( -8 , 0 , 10 ) ; B ( 0 , 0 , -10 )
C ( 8 , 0 , 10 ) ; D ( 0 , -3 , 0 )
Force
(lb) Distance Components Distance
Force Components
dx dy dz
TAD
= 13.1529
TBD
= 10.44
TCD
= 13.1529
W - - - - - -20 -
المادة المعروضة اعلاه هي مدخل الى المحاضرة المرفوعة بواسطة استاذ(ة) المادة . وقد تبدو لك غير متكاملة . حيث يضع استاذ المادة في بعض الاحيان فقط الجزء الاول من المحاضرة من اجل الاطلاع على ما ستقوم بتحميله لاحقا . في نظام التعليم الالكتروني نوفر هذه الخدمة لكي نبقيك على اطلاع حول محتوى الملف الذي ستقوم بتحميله .
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