Solution_02 - CIV-100F Solutions Section B/E Fall 2011...

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Unformatted text preview: CIV-100F Solutions Section B/E Fall 2011 Assignment 2 Due on Monday, September 2 6 th 2011 Draw a FBD if necessary; Pay attention to significant figures; A ruler is always required. 1- Determine the sum of the moment of the shown forces around points A, B and C. (Coordinates are in meters). Solution : Fist we need to resolve 1 F and 2 F to their components. This can avoid finding perpendicular distance from points A, B, and C to 1 F and 2 F , which will be very complicated. The magnitude of each component is: kN F F kN F F kN F F kN F F Y X Y X 9497 . 4 45 sin 2 2 9497 . 4 45 cos 2 2 7619 . 6 25 sin 1 1 501 . 14 25 cos 1 1 = = = = = = = = m kN F F F F M Y X X A = = 942 . 1 ) 2 ( 3 ) 5 ( 2 ) 6 ( 2 ) 5 ( 1 m kN F F F F F M Y X Y X B = + + + = 66 . 14 ) 2 8 ( 3 ) 5 9 ( 2 ) 6 8 ( 2 ) 9 ( 1 ) 5 8 ( 1 m kN F F F F F M Y X Y X C = = 19 . 9 ) 2 ( 3 ) 4 5 ( 2 ) 6 ( 2 ) 4 ( 1 ) 5 ( 1 2- The spider has a mass of 0.7g and is suspended from a portion of its web as shown. Determine the force with which each of the three web strings exerts on the twigs at C, D, and E. String CB is horizontal Solution : The key to approaching this problem is by asking yourself: Which FBD should I draw? Of course if you draw the FBD for the entire problem you will be getting nowhere fast....
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This note was uploaded on 12/10/2011 for the course CIV 100 taught by Professor Nahrvar during the Spring '08 term at University of Toronto- Toronto.

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Solution_02 - CIV-100F Solutions Section B/E Fall 2011...

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