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In "Thinking Physics" there is a question about pushing a barrel up a ramp. The barrel is 100 pounds and the ramp is 3 feet high and 6 feet on...
Asked on 03/08/2021
1 answerWhat would happen if you ionized a gas inside a coil of wire with high voltages? Please correct me if I misunderstood something, but my interpretation is the following: If...
Asked on 03/08/2021
0 answerDo we include $mc^2$ in internal energy $U$? Why for an ideal gas $U=frac{f}{2}RT$ per $mol$ when relativistic mass is also internal even though it is...
Asked on 03/08/2021
2 answerWe all know that light always travels in a straight line. Would it not then stand to reason that changing the path of light requires energy? If so,...
Asked on 03/08/2021
2 answerIn most text books of statistical physics, temperature is defined as : $$T=left(frac{partial E}{partial S}right)_V$$ where $V$ stands for any external variable(s) the system's Hamiltonian depends on. However,...
Asked on 03/08/2021 by Benoit
3 answerThe canonical momentum of a particle in an electromagnetic field is given by $$textbf{P}=mtextbf{v}+qtextbf{A}$$ Is the term $q textbf{A}$ equal to the momentum of the electromagnetic field (which...
Asked on 03/08/2021
1 answerI know that they have proven time dilation in the moving frame from the perspective of the stationary frame, eg comparing two cesium clocks in the jumbo jet test.But...
Asked on 03/08/2021
2 answerSuppose there is a piston as shown below, And, let's say that I press down on the piston using one...
Asked on 03/08/2021
2 answerI'm trying to understand a few things about cosmic strings in cosmology. Consider a single string of energy density $rho$ and tension $tau > 0$. I...
Asked on 03/07/2021
0 answerI've read something about fluid interface and know that liquids tend to reduce their surface but my question is that why do they tend to reduce their surface? ...
Asked on 03/07/2021 by David 2000
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