So I was just reading about adiabatic processes and am a little confused as how it pertains to the atmosphere. According to what I was reading adiabatic processes play some role in the atmosphere, ocean currents, and even currents in the earths mantle. But my question is, why don’t large volumes of fluids constantly convect? For example take the atmosphere, if cool air from high in the atmosphere were to sink down and then heat up through adiabatic processes, why wouldn’t this induce a perpetual convection current in the atmosphere? How about in the ocean or the mantles of planets? submitted ..read more

submitted by /u/Galileos_grandson [visit reddit] [comments ..read more

Hi, i’m an astronomy student in Italy. I wanted to share my big problem and I need to overcome it. Today i had a physics exam on mechanics, and I know i’m not near to the passing grade (18/30). My problem is that when i’m taking the exam i seem to not having the “right ideas” to solve the exercises, so I do something wrong, but when I exit the exam room these “right ideas” come to my mind and i suddenly (?) know how to solve them. Does anyone have the same problem? What can I do? It’s frustrating. I study, and I know the concepts, but when I have to take the exam i feel like i don’t know anyt ..read more

submitted by /u/missvocab [visit reddit] [comments ..read more

Physics: "Main composition of #universe: Ordinary (baryonic) matter (4.9%) DarkMatter matter (26.8%) Darkenergy (68.3%)" Chemistry: And chemical elements now is in universe: "All other elements" (2%) Helium (28%) Hydrogen (70%) Isn't these numbers too much similar? Or it is just coincidence? submitted by /u/Levelchess [visit reddit] [comments ..read more

I’ve noticed that so many extremely bold theories are posed to explain discrepancies in the masses of cooper-pairs and their theoretical values, but whenever experimental data comes out that refutes these theories, their originators make bizarre explanations that become pseudoscientific. Is there currently mainstream research going on regarding the masses of cooper-pairs? submitted by /u/AstroBullivant [visit reddit] [comments ..read more

This is a thread dedicated to collating and collecting all of the great recommendations for textbooks, online lecture series, documentaries and other resources that are frequently made/requested on /r/Physics. If you're in need of something to supplement your understanding, please feel welcome to ask in the comments. Similarly, if you know of some amazing resource you would like to share, you're welcome to post it in the comments. submitted by /u/AutoModerator [visit reddit] [comments ..read more

submitted by /u/Specialist-Ad-5300 [visit reddit] [comments ..read more

Hello Friends, i am coming back to Physics and doing self study. I was inspired by Feynman and tried Feynman lectures exercises but the problems were very hard . So gave up and again started reading after 7 years and stumbled upon “Resnik halliday walker “ . I think this book is very pedagogic. I solve end of the chapter unsolved exercise problems also, but get stuck on some hard problems like out of 90 problems i get stuck 5-6 problems and keep it for future ( i have not solved these for 6-7 chapters now ) , so effectively there are 35 problems out of 7 chapters . I am also Seeing small chan ..read more

So I know how to calculate top of the hill which is Ek= 1/2mv2 because Work=potential energy= kinetic energy at the top, but at the bottom I’m not actually sure how to do it. If someone could please help it would mean a lot. submitted by /u/Fun_Jello_7545 [visit reddit] [comments ..read more