White Holes & the 2nd Law of Thermodynamics

AI Thread Summary
White holes are theorized to be the opposite of black holes, but their existence is debated due to potential violations of the second law of thermodynamics, which states that entropy in a closed system must increase over time. The discussion highlights a request for clarification on how white holes specifically contradict this law. A link to a Cornell University website is shared, providing additional insights into the topic. The conversation suggests a need for expert input from an astrophysicist to further explore these concepts. Overall, the relationship between white holes and thermodynamics remains a complex and intriguing subject.
PhiJ
Messages
44
Reaction score
0
I have read in wikipedia and other places that white holes cannot exist as they violate the second law of thermodynamics. I s'pose my question is a simple one. How?
 
Physics news on Phys.org
Perhaps this thread could be shifted to someplace where an astrophysicist could help...

For now you could read the linked website on the wikipedia page: http://curious.astro.cornell.edu/question.php?number=108
 
Last edited by a moderator:
Wow! Although the question still remains, that was an absolutely fascinating web page! Thank you very much!
 
I multiplied the values first without the error limit. Got 19.38. rounded it off to 2 significant figures since the given data has 2 significant figures. So = 19. For error I used the above formula. It comes out about 1.48. Now my question is. Should I write the answer as 19±1.5 (rounding 1.48 to 2 significant figures) OR should I write it as 19±1. So in short, should the error have same number of significant figures as the mean value or should it have the same number of decimal places as...
Thread 'A cylinder connected to a hanging mass'
Let's declare that for the cylinder, mass = M = 10 kg Radius = R = 4 m For the wall and the floor, Friction coeff = ##\mu## = 0.5 For the hanging mass, mass = m = 11 kg First, we divide the force according to their respective plane (x and y thing, correct me if I'm wrong) and according to which, cylinder or the hanging mass, they're working on. Force on the hanging mass $$mg - T = ma$$ Force(Cylinder) on y $$N_f + f_w - Mg = 0$$ Force(Cylinder) on x $$T + f_f - N_w = Ma$$ There's also...
Back
Top