00:01
Hello, student.
00:02
So basically in this question, see we have given i'm made for suppose i can grow a situation like having x, y and z axis.
00:15
So like i'm having this axis in positive x direction, this to be in negative x direction, this to be in y direction, this to be in minus y direction, negative direction.
00:35
So here if you see here is our b and here is our a here is our a here is our d and there is our c so there this is 90 degree this to be to be 240 degree and this angle to be alpha i can write more precise so this is our alpha angle now moving ahead c data let the mass of a b's a c and d the m a m c and m d so its mass is m a m c mc m d respectively let mass a makes alpha angle with mass b so theta a we can say that is alpha and and for theta a we can say alpha and from theta b that is equal to alpha plus theta b now moving ahead again let theta b as a reference theta b will be equal to zero and hence from this reference we can say theta a alpha theta b equals to zero theta c will be equal to 90 degree and theta d will be equal to 240 degree now for the process again to be executed like from the above information we are also having position of the planes that is and this this this this should be a b c and d this is reference plane and this is the equal distance that this would be occurs to x this also x this also x now this is figure b i can say position of planes see that from the balancing equation on resolving m -a -r m -br and b cr and m -d r horizontally we have in now horizontal direction we have a situation that is equal to be i from a to d this is the m i r pose theta i equals to zero so this is an important situation in horizontal direction that defines us that m a course theta a plus m d plus theta a plus m d c .c .r.
04:41
C.
04:41
B.
04:44
Plus mcr.
04:46
P.
04:46
C.
04:49
Plus m .d.
04:54
C.
04:54
D.
04:58
Equals to 0.
05:00
Final sense the system is in complete equilibrium.
05:03
So we can say that m .a.
05:08
Cose alpha plus 7.
05:10
C .0 degree plus mc c.
05:18
Plus md cos 240 equals to 0.
05:24
So this i can say this would be equals to 0.
05:28
Now putting value, ma, cos alpha plus 7, equals 0 is 1, plus minus 0 .5, multiply by md equals to 0.
05:40
From here i get the final equation to be ma cause alpha equals to 0 .5 md minus 7.
05:53
This is our final equation i can put this name to be one.
06:01
Now moving ahead similarly on resolving m -a -r, m -b -r and m -d -r vertically we have situation like m -a -r m -a -sin alpha plus also having the r i can write initially that is three -town.
06:36
So you will understand more properly...