Atwood Machine Help: Problem 1 Harvard

AI Thread Summary
The discussion revolves around a physics problem related to an Atwood machine from a Harvard homework assignment. The main equation referenced is f=ma, alongside the principle of string conservation. The user expresses confusion about the relationship between the tension in the strings and the overall setup of the problem. They seek assistance in understanding how to approach the solution effectively. Clarification on the specific question is also requested for better guidance.
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Homework Statement



http://isites.harvard.edu/fs/docs/icb.topic725237.files/problemset3_2010.pdf (Problem 1)

Homework Equations



f=ma, string conservation

The Attempt at a Solution



I'm not really sure how to do this. I know that the t of the string on the left is equal to the two strings in the middle, and... I'm just kinda confused... Any help?
 
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the question is not shown(i need to have an id ) .. can you write your question here ..
 
Thread 'Variable mass system : water sprayed into a moving container'

Thread 'Variable mass system : water sprayed into a moving container'

Starting with the mass considerations #m(t)# is mass of water #M_{c}# mass of container and #M(t)# mass of total system $$M(t) = M_{C} + m(t)$$ $$\Rightarrow \frac{dM(t)}{dt} = \frac{dm(t)}{dt}$$ $$P_i = Mv + u \, dm$$ $$P_f = (M + dm)(v + dv)$$ $$\Delta P = M \, dv + (v - u) \, dm$$ $$F = \frac{dP}{dt} = M \frac{dv}{dt} + (v - u) \frac{dm}{dt}$$ $$F = u \frac{dm}{dt} = \rho A u^2$$ from conservation of momentum , the cannon recoils with the same force which it applies. $$\quad \frac{dm}{dt}...
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