Hi All, I have a physics question and do not have anyone to ask. I personally am not a physicist so please excuse any mis used terminology. I have been thinking about the Arrow of Time and we perceive it in a linear fashion, but somehow this led me to waveform theory. I have been trying to prove (what i will write below) my idea wrong with everything I hear, and have not yet. Again not many people around to ask. So could you please help me understand in similar language why my below theory is incorrect? Thank you for your time. There is an old adage about spacetime being like a "bed" and matt ..read more

I love physics but god I am so burnt out. We have finals in 4 weeks, with those 4 weeks full of lectures from 9-5 most days, still learning content as we are only halfway through the course. We have no revision week. On top of this we have mandatory homework: 3 for physics, 3 maths worksheets 2 long maths worksheets and an entire research project and writeup. The reason I have not completed these is not because I am behind- it is because we havent covered their content yet. They are /intended/ to be done over the next 4 weeks. On top of this we aren't allowed to have markschemes for the major ..read more

I am a final year PhD student in mechanical engineering. I chose engineering PhD because I thought it would have better job prospect. I will probably get a job after graduation and go on to live a life in an industry job but in my final year PhD I am realizing that that life is not what I want. I wanted to do research in physics and my dream job would be to be a professor in physics. How crazy would it be to drop out now and pursue a PhD in physics? I am in my fifth year and is an international student. submitted by /u/Forward_Boysenberry3 [visit reddit] [comments ..read more

Age 28. Live in USA. Currently employed as a major airline pilot. I have a Bachelor’s in aviation science. I’m interested in pursuing a different career as a scientist. I imagine I would need to start over with a Bachelor’s in physics followed by a PhD in astrophysics. I currently work 13 days per month on average and believe I could attend undergraduate courses during my days off. Any advice or suggestions for someone who has changed careers later in life? Also exploring the idea of becoming an astronaut since I already have the experience/background of being a pilot. But one step at a time ..read more

I’m writing a (fantasy) novel in which I’d like my main villain to stop the Earth from spinning (among other things). It would happen gradually, so no massive tsunamis or people and objects shooting away from the jolt of a sudden stop — but I imagine I can still get an extinction-level event out of this. I would need time for my characters to stop it though. So, what I’d like to know (if you fine people can help me out) is what are the major phenomena that you would expect in that instance? And how long would you expect it to be before it became some huge cataclysm? Or would it still pretty m ..read more

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

The point I'm hung up on is the logical jump from "since there's an infinite number of waves that pass through the point" to "then there's an infinite number of frequencies". How can we make the logical leap that this implies infinite frequencies if we can only differentiate all those waves if we look at a time interval LARGER than the infinitesimal window? Also If you restrict a complex wave with many frequencies over a given interval there's always going to be an infinite number of waves you can draw that line up with the original wave over the small interval, then do something else outside ..read more

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

I have to take a math placement exam before starting college next year, and I'm pretty worried about how I'll score. I'm not really "bad" at math, just really rusty with my algebra skills since I didn't care too much about the subject during middle/high school. How much of a setback would it be to start my freshman year taking pre-calc instead of calc 1? What if I test really poorly and have to start in an even lower level class? According to my schools website, they will make accommodations for students who need to take lower level math classes to catch up - but realistically how difficult w ..read more

Hello, not sure wher to post this but I am making the robot arm seen in this video https://youtu.be/_caHl5tz6QA?si=IWB7QoycZ98AjGDD but instead of the hand thing I want to add servo motors. The only problem is that they are too small to pull far back enough. Is there a mechanism or something I can do to get the servo to pull the string farther back? submitted by /u/JustBank4892 [visit reddit] [comments ..read more