00:01
Compression is negative.
00:07
The truss is the angle made by a on b c are theta 1 and theta 2.
00:18
So first we have to find the 10 theta 1 is equal to od divided by oc plus ob.
00:39
First to find od we have to take the triangle dco in which we have given the slopes where 10 theta is equal to 6 by 7 so theta value is 40 .60 degrees and now 10 theta is also equals to this 1 .4 divided by the od then from here substituting the value of theta od is 1 .633 meters and oa is 4 .8 minus od then this is 3 .167 meters.
01:38
Now for theta 1, theta 1 equals to tan inverse 1 .633 divided by oc plus ob is equals to 4 so this is equal to 22 .208 degrees.
02:01
Now comes theta 2 which is equal to tan inverse 1 .63 divided by 1 .4 equals to 49 .33 degrees.
02:22
Now taking the joint b where the forces are 7 .3 kilo newton, this force is fab and here it is fbc and the angle between them is cost theta 1.
02:46
So taking the horizontal and vertical components, f .a .b.
02:53
Cos theta 1 is equals to fbc.
02:58
And from here we have fbc is equals to.
03:08
First we have to find out for the vertical forces fab sine theta 1 is equals to the 7 .3 kilo newton.
03:28
Both this equation are divided and we get cod theta 1 is equals to fbc by 7 .3.
03:40
From here fbc comes out to be 17 .881 kilo newton...