Struggling with a Physics Problem? Can Anyone Help Me Solve It?

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The discussion revolves around a user seeking help with a physics problem they previously posted but did not receive responses to. The community emphasizes the importance of providing detailed context and outlining any attempts made to solve the problem, which can attract more assistance. Users are encouraged to avoid creating new threads for the same issue and to "bump" existing threads instead. It is noted that responses may take time as the forum consists of volunteers with varying expertise. Engaging specific knowledgeable users may also enhance the chances of receiving help.
stunner5000pt
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Please don't start a new thread! (It's OK to "bump" a thread if you don't get a response.) See original thread for my response.
 


I'm sorry to hear that you haven't received a response to your previous post. Physics Forums is a community of volunteers who are passionate about physics and helping others with their questions. Sometimes it may take some time for someone with the appropriate knowledge to see and respond to your post. I would suggest providing more details and context about the problem you are trying to solve in your post, as well as any attempts you have made so far. This may help attract the attention of someone who can assist you. Additionally, you can try reaching out to a specific user who may have expertise in the topic you need help with. Best of luck!
 
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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