Assistance Definition and 204 Threads

Im prototyping a machine to lower liquid from a height using a chains and sprockets. Essentially liquid will fill at top, be lowered over a distance of 4.8 metres then emptied at bottom. The liquid needs to be lowered at a slow pace due to resistance on the output shaft, I am considering...

Hello! I have finished high school quite a few years ago. I did a physics course that went over nuclear fusion and fission, and I quite enjoyed it. However, I unfortunately no longer have those textbooks (I sold them on as many people do). Now I am doing a bit of programming in the field of...

I wrote a program to determine the critical mass of uranium oxide with an enrichment of 10%. I got a keff approximately equal to 1 with the selected volume and density (attached a file). Is it possible to somehow run the program without writing the initial density and volume into the conditions...

I am working on this question. Any math help, hint or even correct answer will be accepted.

I'm doing static analysis. I have already set up all the prerequisites, preprocessors such as material addition, sectioning, defining boundary conditions, and displacement. However, I'm not getting the results. Please suggest anything. Kindly find the attachment. regards

Hello, I'm after some advice/ clarification on some gear train design. This may just be a simple clarification Requirements I have a lead screw which needs to be supplied power by a Motor. This Lead screw must have 140Nm Torque to raise and lower the load, and must turn at 200RPM. The motors I...

I have come across this strange method of solving degree 2 polynomials but I do not find the explanation provided to be very helpful. Here is the method description: "In the 16th century, mathematician Francois Viete solved quadratic equations by a unique substitution method. To solve an...

Hi all :) Can't find an online calculator to properly do this. I know basic sqft - if I have a room that is 12x12, the sqftg is 144. Easy. But... I am retiling the shower in my bathroom. Three walls, and not the ceiling nor the floor. I need to speak sqft to the tile store. Two of the walls...

I was conducting an experiment with a tone generator (330 Hz) in boxes of different sizes with a glass plate placed on top of the box. There is a receiver about .55 meters away. Without any interference, the receiver registered -41 db +/- 1 db. When the tone generator is placed in the box and...

Homework Statement:: ODE -> Transfer Function Assistance Relevant Equations:: Newtonian physics, buoyancy, drag [Mentor Note -- thread moved to DE from the schoolwork forums, since it is for work and not schoolwork] Hello all, I'm new here but I'm looking for a bit of guidance with a...

I am interested in determining more efficient ways of determining individuals' body fat percentage. To do this, I measure the circumference of a number of segments (10 of them) of the body and determine the person's percentage body fat through underwater weighing. I have done this for 252 total...

I have recorded the dominant hand strength from all of my participants. I have also recorded a number of anthropometric properties of my participants, including a measure of skin-fold adjusted forearm girth, with the intention of estimating the amount of musculature in the forearm. I have...

I am interested in examining how construction stilts affect walking patterns, and how experience with the stilts affects walking patterns. I recruited a group of expert construction stilt users, and a group of novice users and videoed their both walking on stilts and without stilts. I want to...

Hello, Could I please get assistance with a rock identification. I came across this one in the southwest part of the U.S. While I see a lot of slag from old mines, this rock appears to be something different than slag. Besides, it was the only dark colored rock I came across that day. It also...

Hello, Thanks for providing a forum where people can share their education/passion and help others. Speaking of helping out, could I please get some feedback on this rock I came across in the southwestern part of the U.S.? I picked it up because it didn't match anything else in the area. It sat...

Hi! I am currently trying to troubleshoot an Emerson M200 VFD that is running a 2HP motor that gets up to around 200rpm and then overloads and shuts off... so a little background for you. Motor specs are as follows: Speed: 1700 rpm Motor Power: 1.5kW Horse Power: 2 Motor Voltage: 230V Rated...

(1) Can someone please give the information regarding admission to PhD(physics) specially cosmology in the European universities and admission only through interviews and research proposal is possible?? Listing some of them would be more beneficial. (2) And the rough estimate for the course fee...

Good afternoon, I am carrying out a practical magnetism project which involves 2 small (2mm x 2mm - 0.6kg) neodymium magnets attached together, and an electromagnet to create a push-pull force from below in order to part them. For those that also build model railway/railroads, this will be a...

I have some difficulties answering part (b), (c) and (e). Help is appreciated.

Hello all, I have done part (a) of the question as attached and am not sure if they are correct. Would appreciate if you can help me to see. Next, I have no idea how I should do part (b). Greatly appreciate! Thanks in advance!

I teach English at a university in China. I don't want any of my students to fail so I need to adjust exam marks. The exam marks range from 20 to 100. I want to adjust them so that the marks will range from 60 to 100, but I want to retain the proportional relationship between the marks. So for...

The power series $$\sum_{n = 2}^\infty \frac{(n-1)(-1)^n}{n!}$$ converges to what number? So far, I've tried using the Ratio Test and the limit as n approaches infinity equals $0$. Also since $L<1$, the power series converges by the Ratio Test.

Hi, I am having trouble solving the following equation: $$x^2-x-4=0$$ I would really appreciate it if anyone could help.

I have no clue how to use it. Can someone tell me in a basic way? Also provide links for downloading? Note, I haven't even downloaded it. I recently downloaded MikeTex but have no idea how to start this all out. I need this for writing a research paper.

While at university, we went over logical operators for our electronic circuits lab. There was one that depended on the previous value which fascinated my deeply, but for some reason I can't remember it. I only vaguely remember it so I apologize if I mess up what actually happened. From what I...

I work in R&D for coatings and have a bit of a plumbing problem on my pilot coater. I've formulated a very reactive mix that, once mixed, increases in viscosity by 3000cP an hour. This makes it very difficult to get a constant roll of sample material to send to customers with the equipment...

Homework Statement My task is to write a program that reads from the .txt file into a list which contains two parts, the part of the text from the file and a pointer to the next element. Here are the specifications of the problem: When reading from the file you should separate the letters from...

Hello. I recently graduated from a large state school with a bachelor's in physics and a minor in nuclear engineering. I ended up with a solid GPA. I didn't really have a plan for myself all throughout college, which I regret now. I started off with the intention of going to grad school, but I...

The spacecraft "Helios 2" (with 100 kg of mass) used the Sun to get a speed of 250.000 km/h using gravitational assistance, I want to know if the mass of the spacecraft influences the result of the speed. I mean, if the spacecraft mass 10.000 tons, the speed would be less of more?

Hello everyone, I've been lurking awhile and reading other threads about REU acceptance, and realized this would be a great place to post my question, given that I really need insight from people who have done all of this before me. I'm in an odd situation. I was accepted into two...

i want to Mesh volume1 of 0.250 X 0.180 X 0.005 (solid 45) and another volume2 of 0.050 X 0.020 X 0.005 (solid 5)placed at the centre & on top of volume 1... i m not able to mesh please assist...

Greetings! I do not know whether or not this is the correct location for my post. I also apologize in advance if my question seems too simple, nonsensical, or downright idiotic. I am only a high school 1st year, therefore I do not have much knowledge of anything significant. So, while watching...

Homework Statement Hello, I have to use the HP 10s calculator at my university, I have been used to my modern casio for the last 4 years but I have a problem. The square root symbol when pressed does not allow for continual calculation, such as when I am using the quadratic formula. It seems to...

Hello, I'm trying to find a way to allow people to send me remote assistance requests so I can control their computer but without having them first configure firewall rules on their end. The simplest solution seems to be to setup a vnc server on my end, configure my firewall rules appropriately...

Trig help please! CNC Machining/Engineering

I'm looking for assistance in designing an alien race, for lack for a better term. I'd like insights from people familiar with biology etc. Where is the best place to post such a question and follow up questions? Or is such a discussion entirely inappropriate for this forum? Thanks.

Hello, I am currently writing a novel and there are quite a few situations that I would like to create that involve orbital dynamics. I would like to be as realistic as possible. I am seeking a knowledgeable person that can ballpark these problems. I do not think that it would take to much of...

Hi All. My name is Simone and i have joined for the purposes of correcting my personal educational inadequacies. I have an inadequacy in my formal education as i only went to Year 8 in Australia. I am struggling to help my daughter at the moment. My 16 year old daughter is stumped on some...

As revision for my upcoming physics exam, I'm doing an old exam paper from a previous year of the course, for which the answers aren't published. However, I'm stuck on a basic angle of refraction question: "A light ray makes an angle of 35degrees to the surface of an oil layer. [A diagram is...

I am an aspiring Astrophysicist/Astronomer from Omaha, NE and I am competing in the National Science Olympiad in May. I would like to say I have relatively basic-mid level knowledge of the field in for a junior in high school, however I am unaware of the type of questions that will be asked (I...

Hey everyone - I am looking for individuals with thorough knowledge of force and/or pressure sensing technology (specifically piezo and/or QTC). I am a designer/inventor with a problem for which I am ill-equipped to solve on my own and could use some guidance. Please reply if you are well-versed...

Homework Statement Use the limit comparison test to check for convergence or divergence: Sum from n=1 to infinity of ((2n)^2+5)^-3 Homework Equations let lim n to infinity of An/Bn = c 1) if 0<c<infinity then either both converge or both diverge 2) if c=0 and sum Bn converges, so does sum An...

Homework Statement Evaluate the integral. Homework Equations $$\int{\arccos{\frac{a}{a+\alpha}}\sqrt{\frac{(a+\alpha)^2}{(a+\alpha)^2-x^2}}d(a+\alpha)}$$ For reference, this is the solution, but I do not know how to get here: $$\frac{a}{2}\ln{\frac{\xi+1}{\xi-1}}...

Hello everyone! I'm almost done with a project of mine and I'm creating a battery with an aluminum casing around. Inside I have a copper electrode (cathode) and due to lack of finding a correct dimension I have to resort to using a stainless steel anode (and I'm also running out of time) So I...

I didn't know whether to post this here or the homework section. But because this isn't actually homework and there are no questions that require mathematical processes, I thought this would be a better place to post it. Feel free to redirect it to wherever it should belong. So quick backstory...

Homework Statement Homework Equations Static equilibrium: Net force & net torque = 0 The Attempt at a Solution Am i doing this correctly for part a? [/B]

Homework Statement The classification of the states of matter as we now know them is a relatively recent system evolved from more ancient and holistic views. These ancient systems, many of them still very prominent today were the guides to thinking about the natural world, they were the...

Like so many before, I have a unit over the next year using Fortran 90 as part of my Physics B.Sc. In advance, I'd like to get it up an running on my MacBook Pro, but having read various threads over the internet I'm not so sure on what to do. I don't want to pay a penny, but if it is the...

At my shop we recently acquired an old 2-post automotive lift from the 70's. The lift has two cylinders, one for each post. The hydraulic lines were a bit hacked up when we got it and we're now in the process of trying to get it up and running again. We have it operational, but the arms are...