Pulley problem, find total mass where ther is no acceleration

AI Thread Summary
The discussion centers on solving a pulley problem involving two masses and tension. The user is unsure how to approach the problem, particularly regarding the conditions for no acceleration. They have derived equations for force and tension but are confused about setting acceleration to zero and the implications for tension. The question of whether the pulleys are negligible is raised, indicating a need for clarification on assumptions in the problem. Overall, the user seeks guidance on correctly applying the equations to find the total mass without acceleration.
vande060
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Homework Statement



you need to see the picture for this one

http://s861.photobucket.com/albums/ab174/alkaline262/?action=view&current=prob13.jpg

Homework Equations



f=ma

The Attempt at a Solution



i don't really know where to start on this one.

i have the equations for force

2T - m2g = -m2a2

N - m1g = 0

T = m1a1

i think i should set a to zero

2T = m2g
T=0

that step doesn't make sense to me, because how can the tension = 0 ?
 
Last edited:
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are the pulleys negligible?
 
Liquidxlax said:
are the pulleys negligible?

yes they are
 
bump. i still don't understand this problem when i solve for t is get t = -2g/(1/m1 - 4/m2)

is that right? what can i do with it ?
 
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