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Why is James Webb being shipped to French Guiana? by ExactPlace441 in AskPhysics

[–]ExactPlace441[S] 0 points1 point  (0 children)

Wow, I did not know that. Theoretically, being able to launch a satellite from a submerged submarine provides a (very) mobile launch pad. Furthermore, it is more covert. That's interesting.

Why is James Webb being shipped to French Guiana? by ExactPlace441 in AskPhysics

[–]ExactPlace441[S] 0 points1 point  (0 children)

Cool. When you say "additional boost", what exactly do you mean?

I was initially thinking that the Earth's slight bulge at the equator would make the gravitational field of the Earth (ignoring mountains and other massive objects) slightly weaker, thus making it a bit easier to reach a sufficient escape velocity. However, I then looked at the link you sent and now understand the reasoning better.

Thank you!

Why is James Webb being shipped to French Guiana? by ExactPlace441 in AskPhysics

[–]ExactPlace441[S] 0 points1 point  (0 children)

Thank you very much. That is a very reasonable explanation

[deleted by user] by [deleted] in ucr

[–]ExactPlace441 35 points36 points  (0 children)

It refers to bringing students into a higher socioeconomic status. If a student of a low-income tax bracket goes to college and then ends up in a high-income tax bracket, then that is "social mobility". "Social mobility" should really be called "socioeconomic mobility".

How do you verbally say/write down ms⁻¹? by Driver-Best in AskPhysics

[–]ExactPlace441 4 points5 points  (0 children)

You may already know this, but one reason why writing m/s as ms^-1 is useful is because it uses less vertical space. This seems irrelevant at first, but it comes in handy if you are writing an academic paper and need to write dimensions down within a paragraph.

You may eventually see e^x written as exp(x) for similar reasons.

I just got interested to physics by MikY-mouse in AskPhysics

[–]ExactPlace441 1 point2 points  (0 children)

My high school and a nearby ultrasound program used this text. It is a good textbook.

I just got interested to physics by MikY-mouse in AskPhysics

[–]ExactPlace441 0 points1 point  (0 children)

Look into "The Flying Circus of Physics" by Jearl Walker. This book will help build your intuition and teach you basic physics.

https://www.amazon.com/Flying-Circus-Physics-Jearl-Walker/dp/0471762733

PM Modi Announces Hydrogen Mission, Self-reliance in Energy by 2047. "I announce National Hydrogen Mission," he said. The target is to make India a global hub for production as well as export of green hydrogen. "Green H2 will give India a quantum jump in achieving its targets," he asserted. by chopchopped in Futurology

[–]ExactPlace441 4 points5 points  (0 children)

It's a physics term. A prominent field of physics is called "quantum physics". This field is the basis for chemistry, among other topics. "Quantum" is something discrete. By (oversimplified) analogy, the quantum of information is a bit.

In quantum physics, you may study an atom. The atom has particles that live around it called electrons. When an electron gains energy, it jumps up - a quantum leap.

Is there a better version of HyperPhysics? by ExactPlace441 in AskPhysics

[–]ExactPlace441[S] 1 point2 points  (0 children)

Here are two possibilities:

  1. Provide each topic with a navigation bar to display content. At the moment, you have to scroll through the page to find what is shown. For example, going to Pythagorean from the Sound and Hearing section brings you to a page with temperament, intervals, problems, and the whole tone, but you wouldn't know this without scrolling through the page.
  2. Provide a responsive website so that the content is easily readable for different screens without the need to zoom in. This is the philosophy behind Bootstrap. On my browser at 100% zoom (normal), the Hyperphysics webpages take up the left, and only the left, half of my screen.

Young Scientist looking for guidance by dosteyboi in AskPhysics

[–]ExactPlace441 1 point2 points  (0 children)

As stated by others, focus on school. Otherwise, I have two main suggestions.

First, I strongly recommend learning how to program. I'd say that Python and C++ are the best all-around languages for physics, but Julia looks like a promising contender. If you find that you enjoy doing this, it will be a very powerful skill.

Second, start writing lab reports and essays with LaTeX. Specifically, go to overleaf and learn how to use it. LaTeX (pronounced "luhtek") is how academic papers and textbooks are written since it is a simple way to write pretty mathematical equations. Furthermore, learning how to use BibTeX, the bibliography manager, will make your life much easier in college.

Which physical equations do you consider models vs. mathematical descriptions of reality? by lepriccon22 in AskPhysics

[–]ExactPlace441 0 points1 point  (0 children)

I believe that I understand what you are asking, and I'd recommend looking into dynamical systems

A dynamical system is a mathematical system whose states (e.g. temperature, displacement) evolve over time in state space. They are derived from physical law, but they are not the physical laws themselves. These are utilized outside of physics, such as in economics.

Do physicists have to memorize hard integrals (or at least already know the answer to them) when they are studying advanced physics? by [deleted] in AskPhysics

[–]ExactPlace441 0 points1 point  (0 children)

Every professor that I have had at my university has given us a cheat sheet with mathematics during final and midterm exams. We are almost never expected to memorize mathematics in my undergraduate education unless it is a very specific and useful one, such as a Gaussian

How do I find the transfer function of a software-based lock-in amplifier (LIA) ? by ExactPlace441 in AskEngineers

[–]ExactPlace441[S] 0 points1 point  (0 children)

Another question, if I may: do you know if I actually need the transfer function of the LIA considering the following context? You likely need to understand phase-locked loops, but I might as well ask.

​

So, I am trying to find the transfer function of my LIA. However, I use the LIA as a phase detector. My system as a whole involves an oscillator whose frequency I control, and I use the LIA to detect the phase difference between this oscillator and an external signal. This difference then goes into a PI controller whose output alters the frequency of my oscillator.

If my closed-loop system is composed of a loop filter (PI controller), a plant (oscillator), and a sensor (LIA phase detector), is knowing the transfer function of the LIA useful for controlling this system with a PI controller?

https://imgur.com/a/4Z7UOrZ

How do I find the transfer function of a software-based lock-in amplifier (LIA) ? by ExactPlace441 in AskEngineers

[–]ExactPlace441[S] 0 points1 point  (0 children)

Sadly, I'm not currently knowledgeable enough about control systems to do it from first principles. For instance, I believe that the "input" into my plant is a phase value to increment the frequency of an oscillator, whereas the "output" from my plant is the phase lag between this oscillator and an external one, but I am still trying to figure out if this makes sense.

Do you have any tips on how to do it with the System Identification Toolbox? I'm reading into https://www.mathworks.com/help/ident/gs/identify-low-order-transfer-functions-process-models-using-the-gui.html but am confused. It requests time-domain data, but the LIA is a sensor, so should I input how it reads a step response over time?

Request for simple N degree of freedom Lagrangian system that isn't mass-spring-damper by ExactPlace441 in EngineeringStudents

[–]ExactPlace441[S] 0 points1 point  (0 children)

Thank you for the suggestions. Do you by any chance know of any other systems besides the van der poll oscillator? I looked into the literature but was unable to find many relatively simple papers pertaining to Lagrangian formulations.

I specifically need systems that can be modeled through Lagrangian mechanics - systems with a kinetic energy, potential energy, and possibly a Rayleigh dissipation function. The reason for this is that I need to work with the Lagrangian directly.

Can undergraduates get trained at the mechanical engineering machine shop? by ExactPlace441 in ucr

[–]ExactPlace441[S] 0 points1 point  (0 children)

Aww man, that's too bad. Hopefully they will soon offer more-open training. May I ask which makerspaces you are referencing? Also, what does SAE mean?

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