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Is this guy correct that the answers provided to his question do not work for x^3 +3x?

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Why is this legitimate notation?

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Question about Rainman’s sum and continuity

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When may we consider a variable force as constant after using limit of Riemann sums (where across each slice, after the limiting process, the force is constant), and when can we not do this? Thanks!

Question about when we can treat force which is variable, as constant in integration based on this snapshot

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When we push a mower, why is the force shown downward-forward at a 45? To me, intuition says we are pushing perfectly parallel to the ground as we hold the handles, but every physics diagram I see shows a downward-forward 45 degrees along the angle

Anyone have any idea why the third diagram would be devoid of current in the common area? It’s really baffling me.

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How to prove the “trivial?” portion not addressed by this proof author?

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On standard analysis and physicists

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On standard analysis and physicists

On standard analysis and physicists

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Physicists and their love of differentials

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Concerning differentials as used by physicists

5 snapshots provided; need help with derivation

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Proof question

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How is equating (dv/dt)dx with (dx/dt)dv justified in these pics

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[physics 2] work for dipole in uniform electric field

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HV lines can produce voltage well above what is needed to run an incandescent light bulb, so why won’t it glow under a HV line but a fluorescent will?

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[Physics 2] why can this parallel portion be considered negligible/nonexistent

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Transformer Voltage Drop Q

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Conceptual question about electric potential

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[physics 2] conceptual question about electric potential

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How does the subreddit AskScience have millions of followers, yet whenever I ask a question, it’s complete silence! Could it be a front for advertisements in a way that violates Reddit’s policies?

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Human capacitance Q

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Looking for advice for Circuit model scenarios I made up in my head to see if my thought process is correct

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