John Rennie
Reputation
99/100 score
 1d reviewed Close What is my real weight? 1d reviewed Close Why am I not shocked when I touch a tree, and the tree touches a power line? 1d comment Can this Temperature Scale be Considered an absolute temperature scale? The Dalton scale is a temperature scale in the sense that you can consistently measure temperatures with it. But you would have to be barking mad to actually attempt to use the Dalton scale in thermodynamic calculations. 1d answered Why is a stellarator-type nuclear fusion reactor so oddly-shaped? 1d comment Can this Temperature Scale be Considered an absolute temperature scale? The Kelvin scale is linear in the sense that for an ideal gas the internal energy is proportional to the temperature. So each extra degree K adds the same increment of internal energy. If you want your Namu scale $T_N$ to preserve this linearity then it needs to be related to the Kelvin scale $T_K$ by $T_N = aT_K + b$ where $a$ and $b$ are constants. I'm guessing this is what you mean by your expression mK + c. If you're not fussed about the linearity then you could use a more general scale, but all your equations will get more complicated if you do. 1d comment Why is power dissipated in a circuit maximum when external resistance is equal to the internal resistance in the circuit? Current is a maximum when $R_\text{ext}=0$ not when $R_\text{ext}=R_\text{int}$. 1d comment Can this Temperature Scale be Considered an absolute temperature scale? @prakharlondhe: Yes, your Namu scale is a perfectly good absolute temperature scale. 1d answered Can this Temperature Scale be Considered an absolute temperature scale? 1d comment Interpretation of time dilation Hi Mason. I think Alfred and Jon are being a bit unkind, because most of your answer is just fine and you correctly pull out the key point that the proper time along a photon trajectory is always zero (this is true in general relativity as well). However I agree that the sentence So, that means that if you travel at the speed of light, you observe no time passing! is meaningless and you should edit it out. 2d comment Why is power dissipated in a circuit maximum when external resistance is equal to the internal resistance in the circuit? I suspect the book means that the maximum power dissipated in the load $R$ is when $R=3$. If you set $R=0$ then the power dissipated in $R$ is obviously zero, and if you set $R=\infty$ the power dissipated in $R$ is obviously zero. So the maximum of the power dissipated in $R$ is somewhere in between. With a bit of algebra you can easily show the maximum is at $R=3$. 2d comment Why neutrinos are weakly interacting? Hi Muthu, we encourage new users to search the site to check if there question, or one very like it, has been asked before. In this case the obvious search quickly finds the duplicate I've suggested. 2d comment Why neutrinos are weakly interacting? Possible duplicate of Why are neutrinos more weakly interacting than light? 2d revised Quantum teleportation + time dilation = time travel? Tweaks 2d comment If increasing applying energy to an atom excites electrons, why does electrical conductivity decrease as temperature increases? @FraSchelle: have you tried Googling for semiconductor conductivity temperature or even searching this site ... 2d answered Quantum teleportation + time dilation = time travel? 2d reviewed Close Resistance is given as mentioned how will we find the equivalent resistance dnt think anyone can do it 2d comment Resistance is given as mentioned how will we find the equivalent resistance dnt think anyone can do it Hi Diya and welcome to the Physics SE! Please note that this is not a homework help site. Please see this Meta post on asking homework questions and this Meta post for "check my work" problems. 2d reviewed No Action Needed Induced current from Generator in Zero Gravity and Vacuum 2d reviewed No Action Needed When two spheres of equal charge make contact, why does the larger sphere gain more charge? 2d reviewed No Action Needed 2 airplanes same size and shap different mass