00:01
In this question, a is hinge support and b is the internal hinge.
00:10
So the concept here is if we broke this in two parts or take this in two parts, the first part will be something like this, it's 3 meter length.
00:24
There will be a f .a.
00:27
And there will be, let's say this will be ra and this will be reaction at rb.
00:34
And 200 kiloton force acting here.
00:38
And at point b, at the point of internal hinge, the net moment, that is, m will be zero.
00:46
So this is the concept here.
00:49
That means that here at point b, the bending moment or m will be zero.
01:02
So since bending moment at this point will be zero, one can say that r .a.
01:09
And r .b.
01:11
Here.
01:11
Now, moment generated up to r .b.
01:13
Will be zero because it is passing through point b only.
01:17
So one can write r .a.
01:20
Into 3 meter minus 200 kilo -newton into 1 .5 equals to 0.
01:27
Solving this, we will get r .a...