(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

you absolutely need to check the link for my problem picture; this is a snapshot of my online book.

http://s861.photobucket.com/albums/ab174/alkaline262/?action=view¤t=prob9-1.jpg

2. Relevant equations

f=ma

3. The attempt at a solution

as you can see from the picture I have let each of the strings dangling be represented by an x value

so:

3x1 + x2 = length of rope

differentiating twice

3a1 + a2 = 0

and the equations for m1 and m2:

m1a1 = -3T + m1g

m2a2 = -T +m2g

next step is to add these two equations together and set equal to zero

3(a1 = -3T/m1 + g)

+(a2 = -T/m2 +g)

----------------------

3a1 + a2 = 4g -T( 9/m1 + 1/m2) = 0

solving for T = 4g/( 9/m1 + 1/m2)

then i can just plug this in to the above a1 and a2 equations to get acceleration right??

and the tension of that tiny little rope below the center pulley till be 2T.

what do you think? Have I made any mistakes

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# Homework Help: Can someone check my solution to this block and tackle problem

Can you offer guidance or do you also need help?

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