List Definition and 494 Threads

I can find my Ignore list but can't figure out how to add to it. Any help?

Is there a way to search(filter) such that just a list of all threads I participated in is generated ( somehow ordered) as opposed to every post made in every thread ordered by date that I'm missing? Like an "all content by", but with multiple post in threads collapsed under a single thread banner.

Hello, I am working with calculating decibels, and there is one equation when using quantities of power and another equation when using root-power quantities (which essentially just converts them to a power ratio and places them into the first equation). I know that common quantities of power...

Ok, i have some rocket data from a 20,000 foot launch. I have the times, altitudes, and velocity at said time. Is it possible to find the terminal velocity from this long list of numbers? I tried graphing the velocities to see where the curve flattens out, since usually that is where terminal...

Hi. I am writing a program in Mathematica that reads a xsl file from excel, then processes it by solving an equation, and lastly turns the processed data into a list for exporting. Context: Finding the maximum speed of a model plane at different altitudes (density). Screenshots of the code and...

This works: a=0.4 Select[ list, #[[2]] > a-0.025 && #[[2]] < a+0.025 & ] {{401803.,0.42485,3.33299,0.776904,0.277985},{402066.,0.40333,9.23462,0.381478,0.397121},{402872.,0.41899,3.47237,0.742789,0.27385}} But why doesn't this work? :- Select[ list, #[[2]] > b - 0.025 && #[[2]] < b +...

beyond 1.) the Newtonian formulation 2.) The lagrangian formulation 3.) The Hamiltonian formulation What other formulations are there

Suppose I have 2 collections of lists. In the first collection the lists consists of random integers, with most (but not all) in the range 0-1000. In the second collection the lists consist of integers calculated in the following way: a. start with a random integer of similar range to the...

Being on the FTCs no call list doesn't seem to make any difference for me. I get calls all the time from people wanting me to buy something. :oldgrumpy:

Hi all. I'm working on my final project for a class. The assignment is to have a linked list of personal records, and then do some things with it. Right now I'm working on the linked list class "List.h". I've implemented a Person class "Person.h" as a composition of 3 subclasses "Address.h"...

Hi PF! I am trying to import k.txt file into Mathematica as a list of numbers. The k.txt looks like this: [5.315967917338153e-06, -3.204321972222162e-08, 3.6041782425371564e-09, -3.853442465663655e-08, 8.699510604529962e-07, -1.4284341965847237e-08, 2.855341882658808e-09...

Hello PF! Initializing with an empty list [], how would we perform the operations [[1]] and then [[1,2]] then [[1,2,3]] then [[1,2,3],[2]] then [[1,2,3], [2,4]] then [[1,2,3],[2,4],[1]] and so on. I'm trying to do this iteratively, so within a for-loop. Basically, given a list of numbers...

The following Python 3 code is provided as the solution to this problem (https://leetcode.com/problems/subsets/solution/) that asks to find all subsets of a list of integers. For example, for the list below the output is [[], [1], [1, 2], [1, 2, 3], [1, 3], [2], [2, 3], [3]]. I am not familiar...

I want to find difference between two list. I came across sth called list comprehension. I can't tell you how confused I am with this. # Python 3 code to demonstrate # to remove elements present in other list # using list comprehension # initializing list1 list1 = [1, 3, 4, 6, 7] #...

I want to find difference between two list. I came across sth called list comprehension. I can't tell you how confused I am with this. # Python 3 code to demonstrate # to remove elements present in other list # using list comprehension # initializing list1 list1 = [1, 3, 4, 6, 7] #...

I'm sorry if you get this question often. I wish there was a definitive list at the top of Google searches but there wasn't. I want to learn physics from textbooks. I know basics of Trigonometry. I went through a third of Kline's calculus and found it doable and enjoyable. I also tried Spivak...

7. Fruehauf Super Dump The super dump has a load-bearing axle rated at as high as 13,000 pounds. The large distance between the first and last axles is in fact the maximum allowed under the federal bridge formula. Developed by Strong Industries, the super dump is renowned for its high payload...

Hello! I'm a rising senior in undergrad, and grad school's on my mind. I want to get a better feel for research but don't want to fully commit to a PhD, and so one of my professors recommend I look into grad programs with terminal master's degrees—that is, schools that offer a physics master's...

Given a list [ a,b,c,..., z] in Python, write a program to determine if the terms are monotonic or not. I can do either , and combine theminto a long, clunky program, but trying to see if I can find a succint way of doing both. I have heard that using ' Nums' may do it,but it seems too...

Is there an up to date list of all cosmological theories resource which provides some or preferably all of the following information: Which theories are considered speculative and even highly speculative? (degree 1 to 4) Which theories are still actively being worked on and roughly how many...

This thread is only for fans of the TV series "The Mentalist". (It's a bit old, but I am watching it now.) One of the main unrevealed questions in the TV series is how did Red John know the Jane's list of 7 suspects? By googling I have found a lot of theories, but neither seemed very...

In my previous post I asked about some science documentaries to which I got some really fantastic recommendations. Also @jedishrfu listed a very helpful website mathispower4u.com. It covered each and every important concept till high school level and the basics were also quite helpful. So, what...

Hi all, Whoever's reading this, I hope you are well! I'm applying to 12 different physics REUs for the summer and only recently became aware of how competitive they were. I was wondering if anyone would be willing to help me with my current REU list– is the list too unrealistic? Are there other...

Using the definition of the span, we obtain $$\mathrm{span}\left(v_1,v_2,v_3,v_4\right) = \left \{ a_1v_1 + a_2v_2 + a_3v_3 + a_4v_4 : a_1, a_2, a_3, a_4 \in \mathbb{F}\right \}$$ Suppose $$\mathrm{span}\left ( v_1-v_2,v_2-v_3,v_3-v_4,v_4 \right ) = \left \{a_1(v_1-v_2) + a_2(v_2-v_3) +...

When salt is added to water, the water H20 molecule breaks apart. If you add apple juice to water, does it also happen? I'd like to see list of all substances that when added to water can break apart the H20 molecules and manner of breakup. Which of them is like salt added to water? Thank you.

List all elements of \[ (Z_4\times Z_{12})/<2,1> \]

Let us consider two sequences: $$n_k \in \Omega,\,k=1,2,...K,$$ $$m_k \in \Omega,\,k=1,2,...K,$$ where $$\Omega:=\{n\in\mathbb{N}|\,n\leq K\}.$$ Let us define $$\sigma_n:=\sum_{k=1}^K k\, n_k,\,\sigma_m:=\sum_{k=1}^K k\,m_k$$ The task is to find all possible ##(n_k,\,m_k)## pairs such that...

Many sources (e.g. Wolfram Mathworld ) give the example of the 6709th and 6710th zeros of ##\zeta## i.e. where the imaginary parts of the argument are 7005.06266... and 7005.10056... respectively. Where can we find a list of all known pairs? I tried searching "6709, 6710" on OEIS but that...

list3=[] for i in range (len(list1)): list3.append(list1[i]) list3.append(list1[i]=!list2[i]) I was just wondering if I am on the right track with this question. I also am confused as to how to incorporate the prime number condition into my code. Thank you, any help is appreciated.

I would like vertical lines with dots at the top of them, with the x-positions and heights coming from {{1.2, 3.5}, {2.3, 4.2}, {5.5, 6.7}} for example.

Homework Statement:: I need to develop my instincts on when to use u-sub, integration-by-parts, trig substitution, etc. But, I need to read/see tons of problems actually being solved with these techniques to know which technique to apply quickly. Relevant Equations:: Sorry for the vague...

So in the class TJTwitter, I have the following defined: private Twitter twitter; private PrintStream consolePrint; private List<Status> statuses; private List<String> terms; private String popularWord; private int frequencyMax; and in the same class, I have a few methods that are meant to...

Hello everyone! I'm an international student applying for Ph.D programs for fall 2020 (mostly Astronomy, specifically Cosmology; but some are in Neutrino Physics). My qualifications: Undergrad institution: US univ ranked 100+ by US News with very good neutrino Physics program Cumulative GPA...

This link https://www.ligo.org/about.php and this link https://my.ligo.org/census.php show me the list of participating universities in LIGO. I am currently doing research under a professor at my university who is a member of LIGO. Neither of the above links lists the names of the individual...

I have a list containing several lists with two elements each. I want to multiply the last element in the inner lists with a number x, and then print the new list. How do I do this?

I'm a layperson who loves physics. Unfortunately studying it in a university is not an option for me right now. So I've decided to study it myself. My knowledge so far is upto high school physics. I do know some special relativity but mostly in a conceptual manner, not a rigorous mathematical...

Hey guys, Sorry that it's been a decent amount of time since my last posting on here. Just want to say upfront that I am extremely appreciative of all the support that you all have given me over my last three or four posts. Words cannot express it and I am more than grateful for it all. But, in...

One hexaquark is stable and well known. All the others must decay weakly. But of all the other possible hexaquarks, how many are bound, how many are unbound to strong interaction but decay by elastic collision, how many undergo exothermic quark exchange and how many are unknown?

I am currently working my way through some w3schools python exercise on tuples and lists etc and one question was to write a program to converted a tuple to a string. Now originally I used the str() function on the tuple and printed the result. I then used the string in a for loop for a...

I have a program where I am supposed to find out the pressure, given the ideal gas equation with Van der Waal's correction, $$\left(p - \frac{a}{v^2}\right)\left(v - b\right) \ = \ Rt$$I have to take a constant value for ##t## (user input), and ##v## will range from 1 to 20 in steps of 0.01. ##a...

What is the abbreviation and meaning of terms like 1D03 and 1E03 in physics context? Reference Url - 1

Hi! Is there a complete list of exact stationary solution of the Einstein field equation? I started to solve it for an interesting electrovacuum case. I'd like to check my results. I have found Thomas Müller's catalog of spacetimes and Hans Stephani's Exact Solutions of Einstein's Field...

I am a free-lance Software developer. Recently, I got a big project in my very 2nd assignment where I need to develop a Vibration Analysis Software for condition monitoring of some heavy motors. One of the "Terms & Conditions" of the project is that there must be at least 200 pre-definded...

Hi, I can't traverse the doubly linked list. My code is:class Student{ int id; String name; Student next, prev; Student(int id, String name){ this.id = id; this.name = name; next = null; prev = null; } } public class DLLAddtoTail { Student head =null...

Contact me to add more! Let's build a master list! To change To Multiply by acres hectares .4047 acres square feet 43,560 acres square miles .001562 atmospheres cms. of mercury 76 Btu/hour horsepower .0003930 Btu kilowatt-hour .0002931 Btu/hour watts .2931...

I've reviewed my bookmarks and found some helpful online tools. Please report broken links to a moderator. Additional - serious and not-so-serious ones - should be added here, so please get in touch with a moderator. Links checked: 08/11/25 Latest Update: 08/11/25 (Meme Maker, Universal...

Hello, I am trying to find a breakdown of all the elements that a ribosome complex would contain. Any feedback appreciated!

my current skills in math are differential eq and linear algebra... and I am about to start reading Feynman lectures of physics and planning to read all John Baez's recommended books.. after reading Feynman's, what would be the next best thing to do? learn more math? or jump already to core...

Is there an on-line list of all possible Feynman diagrams for all the known particles?

Hi. I am looking for physics books of a particular type: concise, and very well regarded. Two examples I found are "Mechanics", by Laundau & Lifshitz; and "Elementary Statistical Physics" by Kittel. Both are around 200 pages and they cover a lot of material. Unfortunately, I don't have the...