Unanswered Topics: Common Issues on Physics Forums - 154374, 154373, 154375

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Unanswered topics on Physics Forums often stem from users not showing their work when posting questions, which is a requirement for receiving help. Members emphasize the importance of demonstrating effort and thought in queries, as this encourages responses from homework helpers. Many users are encouraged to conduct preliminary research before posting, as basic definitions and concepts are readily available online. Complaints about unanswered threads should be directed to the Feedback forums rather than the main discussion threads. Adhering to forum rules and showing genuine effort in problem-solving can significantly improve the chances of receiving assistance.
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This is not a suitable way to draw attention to your threads.

Each of those threads was simply a question, to which I had to remind you to show your work. I guess noone's looked into them yet, and I forgot about then! You should be patient in the homework forums. In future, if you show your work at the start, then this won't happen (since homework helpers normally look for threads with 0 replies)
 
Perhaps because you repeatedly post questions without showing your own efforts and once pushed for your working, your subsequent posts do not seem to indicate any deep thought on your part. It may also be advantageous if you were to google before posting, definitions such as uniform magnetic field can be found in seconds and questions relating to friction and surface area are well documented on the Internet. All in all we don't expect you to know how to do the questions (or else you wouldn't be here); but we do request that you have thought seriously about a question; not just taken a cursory glance at the question and decided that you can't do it.

As an aside such complaints should be lodged in the Feedback forums.
 
We keep on telling you to show your work, yet when you have a new question, you never do so. I would assume that you should have learned the rules by now since you've been here for a while and you have been repeatedly asked to follow them. Your threads indicate no thought on your part.
 
ranger said:
We keep on telling you to show your work, yet when you have a new question, you never do so. I would assume that you should have learned the rules by now since you've been here for a while and you have been repeatedly asked to follow them. Your threads indicate no thought on your part.

I am very sorry! I was waiting. I never found the rules. I think a lot about my problems but when I can think of nothing I seek your help. I think that its not to provide my thoughts when I already know they are wrong! Our teachers are just good for nothing and I want to rise high. I want get my basics cleared. I am sorry for all the rules I violated. I am a student of class IX. And I love Physics, Computers, Maths and Astronomy.
 
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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