00:01
This is our figure drawn like this, this is a, this is b, here it's attached a surface and a 90 kilo newton force acting on here, this is c, not b, it's c, here fb and a force acting in this direction that is 30 kilo newton and also this direction is 30 kilo newton.
00:26
Okay, so fc, the force acting on this direction fc equal to 90 kilo newton.
00:36
Okay, so fb, this is fb.
00:40
Okay, so i can return here in this figure, here this length is 4 and this length is 5, this is theta, so this angle, this small angle is also theta.
00:52
Consider this is a triangular, so i can return as cos theta equal to 4 by 5 that is cos theta, that is the adjacent angle divided by its hypotenuse.
01:10
So fb, the angle fb, i can return as 2 into 30 cos theta, 2 into 30 cos theta, that is this two force and force acting this, this is the force acting, this is angle theta...