Application Definition and 998 Threads

Hi people, I got data science trainer job in Reston, Virginia. I am thinking of joining any community college/evening college/university courses in physics so that I can use these credits when I apply for my masters in computational physics/earth sciences. I am from computer science background...

Hi, I uninstalled the PF app from my Android. Now I can't see it anymore on Google Play Store to reinstall it. Can you help me ? Thank you.

I graduated 2 years ago with a degree in astrophysics. I went to a top school (depends on the source but top 3-5) but didn't do well or participate in research, I focused more on education and teaching. I've worked the past two years (one year as a physics teacher, the other as a data analyst)...

In Halliday's physics book, there is an example of the first law of thermodynamics that shows its application. The figure below explains this example: Here is a question, if the element alone is chosen as the system, doubts arise in the first law, because in this system, Q<0 (because heat is...

When I run the application, I get an error message. Fatal error electron importances are zero, I can't find what's wrong in the code.

Hello everyone. I work in Clinical Research and have an idea for CTMS (clinical trial management system) that I would like to build from scratch. My idea is a bit more complicated than just a data management application and I want to prioritize speed/efficiency of data retrieval/processing and...

Hello everybody! I know in classical field theory adding in the Lagrangian density a term of the form Fαβ (*F)αβ (where by * we denote the dual of the field strength tensor) does not change the EOM, since this corresponds to adding a total derivative term to the action. However when computing...

Get your friends and family to play this simple little game that illustrates a key aspect of stochastic mathematics in application to finance. Draw on a big sheet of paper a sequence of 30 squares and label them consecutively 0 (bankrupt), 1, 1, 2, 2, 3, 3, 4, . . . , 14, 14, 15...

I am struggling with part b of the question attached in the screenshot. For part a, I simply add the components of the given forces. I tried calculating the moments using vector cross multiplication, but I don't know what to do after that or even if that step is useful.

I am in the process of applying to the University of Hamburg. As an international student, I have to get my Indian certificates "converted" to the German system before the application begins in February. The university has released a set of rules for this...

Dear all, I'm currently working on a basic coating application and I'm struggling to get the flow rate stable. I'm trying to figure out how to calculate the theoretical flow rate in the application. The coating is stored in a pressure tank, which we put on an overpressure of 15psi. From the...

A = set of even 7-digit even numbers ## = 9 * 10 * 10 * 10 * 10 * 10 * 5 = 4500000 ## B = set of 7 -digit numbers with three 0s ## = 9 * { 6 \choose 3} * 9 * 9 * 9 = 131220 ## ## |A \cap B| ## Portion that does not end in ## 0 = 9 * { 5 \choose 3} * 9 * 9 * 4 = 9^3{ 5 \choose 3}4 = 29160...

So if I'm understanding correctly, companies provide grants to universities to conduct certain research. The professors oversee the grants and have PhD student help contribute to the research under that grant. Based on this, it seems that PhD students don't conduct research "any question" they...

I would like to practice SQL and install MySQL, one of the most popular open source DMBS. MySQL workbench can also to be installed and used as a visual GUI to interact with MySQL which in turns interacts with the database. My question: is MySQL a server application? If so, what does it mean? I...

I already have an MSc from outside the EU. But, I also have an incomplete CS degree from Poland which I dropped out of. European Ph.D. schools often ask for a CV, not "all the transcript from all the attended programs" as they ask in North America. Therefore, can I skip the information...

Hi my name is Idan. I plan to study for a physics Bachelor at Israel, my homeland. although is way too early I'd like to proceed towards higher education as well, particularly in the US. The problem is that in Israel there is no physics internships and research projects offered for students at...

Homework Statement:: Sand is rough and black so it is a good absorber and radiator of heat depending on temperature. During the day, sand's radiation of the sun's energy superheats the air and causes temperatures to soar. But, at night most of the heat in the sand quickly radiates into the air...

Hello all, I have a question regarding FPGA performance vs GPU (I've reviewed it before). I’m trying to recover lost bitcoins that I mined in the early days. I knew it was important to keep the private key but in the end I somehow managed to lose my private key but I still have 24 out of 32...

I was wondering if someone can explain how failure criteria work when dealing with viscoelastic materials. I'm quite new to this, so I only know how they work with brittle and ductile materials. (not in too much detail either). And now that I'm at it anyway, if possible an explanation on...

I need to make an application that uses database in python, what should I make? Firstly I need to tell about me. I know 0 about programming. I have learned basics of python only. What are the apps that use database that are upto my level of programming? I am planning to use django...

Hey all, I recently took an aerodynamics exam that included the question "Please Explain how the Bernoulli Equation can be Applied Inside a Boundary Layer". Now, it is my belief that the Bernoulli equation, defined by my textbook as P+0.5ρV2=ℂ, requires inviscid flow to be properly applied...

In classical and continuum mechanics if we want to find equation of motion of the body we draw force diagram and apply Newton's 2nd law. In continuum mechanics, equation of motion actually refers to a special point of the body known as center of mass (COM) which can be proven by definition of...

Work - energy principle states that work done by net force acting on the body equals change in kinetic energy of the body. We are talking about continuum mechanics. This principle is usually introduced in mechanics of solid bodies. For us to describe the motion of the body, it is enough to know...

Summary:: A nitric acid solution enters at a constant rate of 6 liters / minute into a large tank that originally contained 200 liters of a 0.5% nitric acid solution. The solution inside the tank is kept well stirred and leaves the tank at a rate of 8 liters / minute. If the solution entering...

I build a Z-axis (not the one displayed on image). The weight of the Buildplatform is 2.29kg and is going to be used on a MSLA printer, so the weight might get increased 1kg additionally, so 3.29kg. The problem is that when detached from the printed model from Fep film there is a resistive...

So the top of the structure is a triangle with height x. and the height of the rectangle is 2 + x, and the length is 3x. I'm unsure where to go from here. I tried using the formula and getting 3x^2 + 6x +x = 3x^2 + 7x -336 =0 I applied the quadratic formula but it gave me non-integer solutions...

I need advice in writing statement of purpose, particularly on my field of interest. I come from an undergraduate university which there is nothing much going on, just take courses and lab work, no research or anything like that available, hence I don't really have enough experience to describe...

Good morning everyone! I am an aerospace engineering working on my thesis and i am trying to solve a little problem. In the picture you can see an "aeordynamic" body. The CFD analysis gives me the forces and the moments acting on this body. How can i calculate the momentum acting on the body...

I am an undergraduate physics student from Indonesia, entering the fourth year this September. I am very excited about physics, about studying the behavior of a phenomena through math. I would like to apply for PhD in physics after graduating next year. I know PhD is research oriented, and...

(a) Due to Coulomb's law all charges whether internal or external to Gaussian surface will contribute to the electric field. This is also mentioned as it's correct answer. (b) The answer is "equal to", which makes no sense to me. It could be greater than, equal to, or less than that obtained...

A rumour spreads through a university with a population 1000 students at a rate proportional to the product of those who have heard the rumour and those who have not.If 5 student leaders initiated the rumours and 10 students are aware of the rumour after one day:- i)How many students will be...

I'm in the process of applying for jobs as a recent graduate( December 2020 ) and was curious what types of projects I could work on by myself to showcase my capabilities in Power Distribution Engineering (simulations, design work etc.). I was thinking I could build a presentation around it...

Hi everyone, I have a quick question about Aleph numbers. Are they even possible? By containing infinity to a finite set, isn’t that essentially disproving the infinity in the first place? Can they be used in an actual scenario’s, or are they just purely hypothetical? Can they be used to...

Gonna preface by saying I never thought linear algebra would be a class I would regret not taking so much... but in short the goal is to reduce an arbitrary symmetric NxN system using a set of auxiliary constraint relationships, e.g. for a 3x3 \begin{bmatrix} V_1\\ V_2\\ V_3\\ \end{bmatrix} =...

Hi Ive write about beams and on last one having bit of trouble finding stuff. Has anybody know where built in (encastre) beams are used. Ive write so far build in beams are beams that are fixed to a flat plane surface. Fixation provide high resistance to force applied (horzontial and...

After graduating with 2-years Masters in TP, I wish to return to academia by undertaking a PhD in theoretical physics and I have A LOT of questions since I am aware that it is a, extremely competitive area especially when you were out of the game for a while, about 5 years for me… What are the...

Summary:: need to know spec of motor, max load of robot. Plan to design robot about 40kg, with mecanum wheel. But can't figure out ... how to calculate torque of motor, how to determine max load of robot, So how to select meterial of wheel (hope its okay with 3d printed material)

Hi Everyone, I applied for some PhD positions in astronomy this year and was unsuccessful. I was wondering if anyone could offer up some advice for improving my applications for next year. To give you some context: I gained my Master's in Physics with Astronomy from the University of...

A rail gun exerts an electromagnetic force on a projectile. The only moving object is the projectile, so is the point of application of force moving? Update - For others reading this thread, after a re-think on this, for linear motion (as opposed to angular motion), the point of application of...

Hello, everybody: I am a philologist who is fond of mathematics, but who unfortunately has just an elementary high school knowledge of them. I am translating La leçon de Platon, by Dom Néroman (La Bégude de Mazenc, Arma Artis, 2002), which deals with music theory and mathematics in the works of...

Summary:: I have been provided with the table in which N and occurence are given. I have been asked to calculate the 1. Total count 2. mean count 3. mean count. Now, assuming our distribution described by Poisson's we need to calculate the tasks. The Poisson's distribution is given by...

Let b = birds Met a bird = (b + 1) Half of us plus you = (b + 1)/2 + (b + 1) The equation is: (b + 1)/2 + (b + 1) = 100 Yes?

Suppose I have 100 identical boxes of length L and the coordinates are x=0 at one end of the box and x=L at the other end, for each of them. Each has a particle of mass m. V=0 in [0,L], while it's equal to infinity in the rest of the regions. If I make a measurement on position of the particle...

Since Tuesday, my dad's emails have stopped coming through on Outlook (desktop application). No error is given, except 'Trying to connect to server'. A few days ago, it asked my credentials for the Office 365 account which I provided (its an active subscription), only after 10 mins of it...

I'm having a hard time solving this problem since I don't really know how to apply the weight force of the trap door. Ideally, in order to find the contact force exerted by the rod, I would find out the weight force of the trap in the point of contact and then find its component radial to the...

So, what I did was suppose the mass of ramp is $ M_r$ and let velocity at B of block be v, then, after inellastic collsion both bodies v' velocity at B , $$M\vec{v}= M_r \vec{v'}+ M \vec{v'}$$ or, $$ \frac{M}{M +M_r} \vec{v}= \vec{v'}$$ Now, Suppose I take the limit as mass of ramp goes to...

I have used my entry-level Zwo colour camera to get movies of planets and, subject to my limited skills, those movies (Avi format) are handled quite happily by Autostakkert and Registax. I have used my DSLR successfully to take multiple long exposure images and they have stacked fine (of...

A tree casts a 23-foot shadow when the angle of elevation of the sun is 52 degrees. (A) Find the height of the tree. (B) Find the length of the shadow when the angle of elevation of the sun is 38 degrees.Part (A) Let h = height of tree tan(52°) = h/52 tan(52°)(23) = h 29.4386575404 = h...

I am applying for a master degree in Germany. I have submitted my application but wish to strengthen it as I want to be accepted. What can I do to enhance my application? Can I contact any of the professors or maybe the student advisor? Will it look artificial? If so, what must I say? (I am...