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Before posting on the Physics Forums, users are advised to review the guidelines provided in a specific thread. For homework, coursework, or textbook-related questions, it is essential to post in the designated Homework, Coursework, & Textbook Questions forum. Users are encouraged to make a genuine effort to solve their problems before seeking assistance, as the community will not complete homework for them. The General Physics forum is intended for discussions about the current state of physics, not for debating concepts like Relativity or Quantum Mechanics. Clear and complete questions are recommended for better responses, and any posts resembling homework questions in the wrong forum may be deleted without being relocated.
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Before posting anything, please review the https://www.physicsforums.com/showthread.php?t=414380".

If you are seeking help with a homework/coursework/textbook related issue please post your problem in the appropriate forum in our https://www.physicsforums.com/forumdisplay.php?f=152" area.

Just a heads up, we prefer that you make a solid effort and completing your problem before seeking help. We, as a general rule, will not do your homework for you.The General Physics forum is for discussions of the current state of Physics. We do not debate the validity of Relativity or Quantum Mechanics here.

Enjoy our forums, there are many very knowledgeable posters here. If you are not sure of your knowledge, read before posting. In general you will receive better information if you post clear and complete questions. Do not assume that we are all familiar with your thoughts and terminology.

Integral

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As a reminder, please do not post Homework/Schoolwork-type questions here. We have a dedicated forum for that:

Homework, Coursework, & Textbook Questions

This rule applies even if your question is not formally part of a HW/Coursework. Any type of question that has the same resemblance to that covered in a typical schoolwork must be posted in that forum, not in here.

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Please note that your post need not technically be for a formal class work. All HW/Coursework-TYPE questions must be posted in the HW/Coursework forum and are required to abide by the same guidelines.

All HW/Coursework-type posts in the wrong forum are subjected to be deleted without being moved to the appropriate forum.

Zz.
 

Thread 'Is calling fictitious forces "not real" just about terminology?'

Hi there, im studying nanoscience at the university in Basel. Today I looked at the topic of intertial and non-inertial reference frames and the existence of fictitious forces. I understand that you call forces real in physics if they appear in interplay. Meaning that a force is real when there is the "actio" partner to the "reactio" partner. If this condition is not satisfied the force is not real. I also understand that if you specifically look at non-inertial reference frames you can...
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Thread 'Derivation of Hamilton's Principle: Questions'

I have recently been really interested in the derivation of Hamiltons Principle. On my research I found that with the term ##m \cdot \frac{d}{dt} (\frac{dr}{dt} \cdot \delta r) = 0## (1) one may derivate ##\delta \int (T - V) dt = 0## (2). The derivation itself I understood quiet good, but what I don't understand is where the equation (1) came from, because in my research it was just given and not derived from anywhere. Does anybody know where (1) comes from or why from it the...
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