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Info: Retired. Long range rifle shooter. 35 years writing software for computer operated equipment, mostly in 'c'. Live in Arizona.
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Please tell me to go study if you see me fooling around in different threads.
I relate to your struggle with distractions while studying. It's frustrating when interruptions derail your focus. Isolating yourself in a room for clarity resonates with me. A structured environment to tackle brain noise would be beneficial. Living with parents presents challenges to create a focused space. Your experience inspires me to consider a similar method when I live alone. Thanks for sharing insights and validating those grappling with similar issues.
Staff Emeritus
Science Advisor
2023 Award
Practical engineering - a great video on railroad track (rails, ties and ballast) with emphasis on the rails - jointed vs continuous(ly) welded rail, the latter being standard on mainlines.

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hutchphd
hutchphd
I love this guy (Grady Hill I think is his name Hillhouse!). My gramps was city engineer of Meadville Pa for decades, so I have a soft spot for the subject. Likely why I am a physicist.
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Updating while watching my students work in class
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Hello 00Svo,
I just created a new post based on your post about the "Relationship between expanding universe and time". I'm glad someone else has thought of this.
berkeman
berkeman
That user was last seen at PF in 2012, so they may not respond to your message. Your new thread is currently under review by the Mentors, BTW.
Gold Member
Thank you for your help with math over the years!!

giphy.gif
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Currently an Undergraduate Physics Student
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Staff Emeritus
Science Advisor
2023 Award
T
tremain74
On my Engineering Mechanics Dynamics Book I am working on a problem that states: "A motorcycle travels along a straight road between two points at a mean speed of 30 m/s. It returns at a mean speed of 15 m/s. What is the mean speed for the round trip." The correct answer is 20 m/s. On working on this problem, is the mean speed the same as velocity?
Astronuc
Astronuc
Speed is a magnitude (scalar), whereas velocity is.a vector with a direction. However, people may use velocity when the should be referring to speed.

In the above problem, one would use the time weight average. Note that at 15 m/s one takes twice as long to cover the same distance as wne traveling 30 m/s

Please post such questions in the appropriate homework forum.
I’ll probably ask some strange questions but I like to try think outside box and hope it might inspired something new or at least helpful but please don’t let anything I ask make anyone lose sleep or mind a simple let’s not go there is ok
berkeman
berkeman
Welcome to PF. There is a saying here, "You can only think outside the box after you understand what is inside the box." That is our mission at PF -- helping you to understand mainstream science, or what is "inside the box".

Asking questions is generally fine. Please do take care to understand the PF rules against personal speculation and personal theory development. You can read more in the Rules link under INFO at the top of the page.

Enjoy PF! :smile:
I studied and worked in particle physics research. After my post doc years i worked in software engineering. I am interested in refreshing my knowledge of physics areas: general relativity and quantum theory.
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Insights Author
Gold Member
I hope you are doing well. I know real life can be very cruel sometimes, and a lot of negative factors or negative situations can be combined in real life and make a person face what Americans call a "no win scenario", that is no matter what course of action you choose, you can't get a win or a positive outcome. In that case the only thing you can do is to try to survive somehow.
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humanlearning369
humanlearning369
berkeman
berkeman
Nope, same error. Maybe I have to be signed in to Github in order to see it? (I don't have an account)
humanlearning369
humanlearning369
Please try again. I had inadvertently had the repo as private. You should be able to see it now. I apologize for this inconvenience.
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Gold Member
I am trying to contact you via Conversation but am unable to do so.
I get the error:

"Oops! We ran into some problems.
You may not start a conversation with the following recipients: Bystander."
Best friend! 🤝
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Nonprofessional cosmologist with a focus on describing the larger picture rather than a single aspect of it. I'd rather be a jack of all physic trades than a master of one.

To that end, I'm a pragmatist with a healthy skepticism. I see the incompleteness and conservatism in physics/cosmology. I want to better describe what we observe, acknowledging the critical need for sound mathematics but with an understanding that science must not get restrained by prominent but incomplete descriptions.
AQA a level physics student
Physics Enjoyer
i have no social media sites but i would like to know more about my past lives..
berkeman
berkeman
Welcome to PF. Please be sure to re-read the PF rules that you agreed to when joining -- see INFO at the top of the page. PF is a mainstream science discussion and education website, and we do not discuss pseudoscience like "past lives". Have a nice day.
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I have been waiting for Physics Forum to approve my "Writer's Application" for about 2 weeks now.
hutchphd
hutchphd
Can someone explain what this is about?
Universal Insight
Universal Insight
I attended classes while attending the University' of of Southern Illinois (Carbondale) and accumulated over 100 + Credit hours with a 3.86 GPA. Within 7 years of start of my 40 year CIA Career, I was managing contracts under which I had contractual Analysts with Masters degrees and Doctorates working on Projects I was tasked to manage. So, I recently found this Physics Forum (PF) about 3 weeks ago and I then decided to apply for a Writer's Application. I have not received PF approval?
Always inquisitive always interested always learning. Enjoying you and the interaction with you the most. Hope to chat and learn with you.
Am new here
Hope am welcome
I have stress in physics ,chemistryand e_maths
Will i get help?🥺
berkeman
berkeman
Yes, we are happy to help you with your schoolwork and other general science questions.

For schoolwork-related problems, post in the Homework Help forums and fill out the Template that you are provided there when starting a new schoolwork thread. That includes the Problem Statement, the Relevant Equations, and your Attempt at the Solution. Always show your work on the problem so that we can then provide tutorial help.

Enjoy PF! :smile:
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Mentor
Congrats on the new EA badge! I enjoy reading your helpful posts in the Academic Advising forum and elsewhere. :smile:
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G
gwnorth
Thank you!
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Mentor
Congrats on the new EA badge! Well deserved. :smile:
gmax137
gmax137
hello guys
If Someone has a Bachelor's of science degree specialized in Nuclear Medicine OR Nuclear Technology, Can They Do Nuclear Engineering as their Masters/PhD? 🤔
berkeman
berkeman
Please keep posting these questions in your thread in the Academic Guidance forum. Almost nobody reads and responds to messages in user Profiles. :wink:
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Gold Member
Test
sbrothy
sbrothy
I think so. I had a plan but i forgot what it was.
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quark bomb would be cool
TR094
TR094
even tho its stupid and wouldnt even work, but it sounds cool
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Hello everyone)
I'm new here and happy to be a part of your community)
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Mentor
Your Profile says that you have a PhD. May I ask what it is in? Thank you.
lodbrok
lodbrok
Biophysics
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Retired - writing books and designing models for 3d printing. Oh yes, and biking.
Hi
berkeman
berkeman
I see that you are the SEO for that school. Please take care not to post any advertisments at PF for that school. Thank you.
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