# Sidesway of a frame

1. Feb 10, 2017

### fonseh

1. The problem statement, all variables and given/known data
How do we know that the MBC larger than MCB ?

2. Relevant equations

3. The attempt at a solution
I think MCB is larger than MBC because the moment of P about C is larger ... So to resist moment of P about C , opposite MCB is required... Thus, MCB is larger

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2. Feb 10, 2017

### haruspex

Yes, the diagram is badly drawn. With P near the left, I do not believe the structure would sway to the right like that. It just doesn't feel right. It would all make sense if P were to the right of half way.

3. Feb 10, 2017

### CWatters

Ive got a feeling they just got the subscripts wrong and it should say..

MCB is larger than MBC

Eg with p on the left it does move to the right.

I

4. Feb 10, 2017

### CWatters

5. Feb 10, 2017

### haruspex

Looking through it again, I agree with you. Thanks.

6. Feb 10, 2017

### fonseh

So , the concluison now is MCB is larger than MBC ??

7. Feb 10, 2017

### haruspex

Yes, it's just a typo, as CWatters posted.