mechanics question rods with inextensible

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dasda
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I have done part a and do not understand how to start part B. can somebody give me some hints. Thanks
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mqb2766
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Take moments about A. Friction must balance the COM
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dasda
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RDKGames I don't understand this question. Can you please help, thanks.
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dasda
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(Original post by mqb2766)
Take moments about A. Friction must balance the COM
What does COM mean?
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mqb2766
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The moments due to the center of mass and friction must balance.
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Muttley79
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(Original post by dasda)
I have done part a and do not understand how to start part B. can somebody give me some hints. Thanks
Draw a force diagram showing forces at the wall. Now the system is in equilibrium so what can we do?
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dasda
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(Original post by Muttley79)
Draw a force diagram showing forces at the wall. Now the system is in equilibrium so what can we do?
Equate the vertical and horizontal forces to 0.
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dasda
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I have drawn a diagram. Is this correct.

(Original post by Muttley79)
Draw a force diagram showing forces at the wall. Now the system is in equilibrium so what can we do?
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Muttley79
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(Original post by dasda)
Equate the vertical and horizontal forces to 0.
You could also take moments ...
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dasda
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(Original post by Muttley79)
You could also take moments ...
Ok i i wi try taking moments.
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Name:  1579202510275189132282003393488.jpg
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Size:  253.4 KBis this correct
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dasda
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(Original post by mqb2766)
The moments due to the center of mass and friction must balance.
For the force i got mg/2
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(Original post by dasda)
For the force i got mg/2
so how does that relate to the coeff of friction?
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0.5mg=ur. but i dont know what R is.

(Original post by mqb2766)
so how does that relate to the coeff of friction?
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dasda
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the answer is 5/12 and I don't see how I will get to that answer.

(Original post by mqb2766)
so how does that relate to the coeff of friction?
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mqb2766
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(Original post by dasda)
0.5mg=ur. but i dont know what R the is.
the reaction of the wall
The horizontal part of the tension
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(Original post by mqb2766)
the reaction of the wall
The horizontal part of the tension
but isn;t this in the direction of friction
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dasda
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I am still not getting the same answer
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mqb2766
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(Original post by dasda)
but isn;t this in the direction of friction
No, its perpendicular to the direction in which friction acts
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(Original post by dasda)
I am still not getting the same answer
Show working?
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