Feb 23, 2026 · We can balance many objects using our fingers. I know that if we place our finger at the centre of gravity of a rod, the torques from both sides cancel out. But net torque being zero does not …

Mar 16, 2024 · There's a lot of room for improvement here. I'll answer the three original questions, but in reverse order, since I think the third question, when proprely considered, will shed light on the others. …

Jan 30, 2019 · In general, both fusion and fission may either require or release energy. Purely classical model Nucleons are bound together with the strong (and some weak) nuclear force. The nuclear …

Feb 24, 2026 · In chapter 2 of "Factorization Algebras in Quantum Field Theory" by Kevin Costello and Owen Gwilliam, they define the observables in quantum case as follows: we consider …

Nov 18, 2023 · In my thermodynamics class, we've seen the Clausius inequality derived for a Carnot cycle, and then extended to any cycle. For the Carnot Cycle, we have that it's the most efficient …

Dec 28, 2024 · Antimatter has the same electromagnetic properties as matter (due to CPT symmetry), so its atoms and solids exhibit identical energy levels and band structures, meaning an anti-object …

Mathematically, the action is defined as being the integral over time of the Lagrangian. So it is a functional over paths that describe what is the motion of the system over a particular path. Also, it …

Oct 14, 2023 · Given: $$ F = m \ddot x = - kx $$ This can be simplified using division and addition: $$ \ddot x + \frac {k} {m} x = 0 $$ For simplicity, we define $\omega^2 = \frac {k} {m}$ because we know …

May 23, 2024 · It's common knowledge that large, heavy trucks can't brake as sharply as small cars. According to the Federal Motor Carrier Safety Administration: The average stopping distance for a …

Jul 30, 2022 · I'm trying one of the most basic physics home experiments: creating an electromagnet by wrapping electrically-conductive wire around a metal screw. My ingredients: a metal screw I don't …