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HNQ
5:07 AM
4
Q: Stefan-Boltzmann Law Applied to the Human Body

OrdpTThe 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…
HNQ
11:08 AM
1
Q: Work done by a body moving in a cicular path

MehmerMy 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…
HNQ
12:25 PM
1
Q: What would happen if you dumped negative mass into an extremal black hole?

blademan9999What 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…
HNQ
9:02 PM
3
Q: What does mathematical consistency in QFT mean?

Fancourt3000My 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...

 

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