 5:07 AM
4  The average person consumes 2000kcal a day, which is equal to ~100W. Furthermore, if one uses the Stefan-Boltzmann law to calculate how much someone loses heat due to radiation, it can be seen that it equals $$Q=\sigma T^4 \varepsilon A$$ $$Q\approx1000W$$ Considering a surface area of ~2m², an e...

6 hours later… 11:08 AM
1  My book has a question: A man is running along a circular path of radius $7$ m and comes to rest after travelling a distance of $45$ m. What is the work done by the man? The options are (a)$>0$ (b)$<0$ (c)$=0$ (d)None of the above The answer given is: (c) $=0$ \$\because \cos\theta=\cos 90=0...

1 hour later… 12:25 PM
1  What would happen if you dumped negative mass into a near-extremal black hole? It appears to me that doing this would reduce the Black hole's mass without reducing the angular momentum or charge? Could this create a naked singularity?

9 hours later… 9:02 PM
3  My question is more naive than Is QFT mathematically self-consistent? Just when people talk about the mathematical consistency of QFT, what does consistency mean? Do people want to fit QFT into ZFC? For example (could be in a more general context) , if I refer to https://souravchatterjee.su.domai...