Solving a Challenging Physics Problem: Need Help?

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SUMMARY

The discussion centers on solving a physics problem involving three masses (m1, m2, m3) and their relationship to force (F) and acceleration (a). The equations used include F = MA and T = m1a, leading to a final expression for force as F = (M + m1 + m2 + m3)[(-m3g + m2g)/ m1]. A key insight provided by a participant suggests simplifying the final answer by substituting the relationship between m2 and m3, which enhances the clarity and accuracy of the solution.

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Homework Statement



problem in attachment

Homework Equations



F= MA

The Attempt at a Solution



for m2: F= ma = T + m3g - m2g
T = -m3g + m2g

for m1: T = m1a
a = T/m1
plug in: a = (-m3g + m2g)/ m1

All 3 blocks: F = (M + m1 + m2 + m3)a

final answer: F = (M + m1 + m2 + m3)[(-m3g + m2g)/ m1]

So yea, I'm thinking this is wrong. Any advice on how to solve this would be appreciated.
 

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Knight526806 said:
final answer: F = (M + m1 + m2 + m3)[(-m3g + m2g)/ m1]

Looks okay to me.

[Edit: Your answer is generally correct. Realize though that the problem statement gives you the relationship between m2 and m3. So you could simplify your final answer by substituting in this relationship, thus getting rid of the m3 variable.]
 
Last edited:

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