# What is Practical: Definition and 323 Discussions

Pragmatism is a philosophical tradition that considers words and thought as tools and instruments for prediction, problem solving, and action, and rejects the idea that the function of thought is to describe, represent, or mirror reality. Pragmatists contend that most philosophical topics—such as the nature of knowledge, language, concepts, meaning, belief, and science—are all best viewed in terms of their practical uses and successes.
Pragmatism began in the United States in the 1870s. Its origins are often attributed to the philosophers Charles Sanders Peirce, William James, and John Dewey. In 1878, Peirce described it in his pragmatic maxim: "Consider the practical effects of the objects of your conception. Then, your conception of those effects is the whole of your conception of the object."

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1. ### B How do equivalent ratios work in practical terms?

my doubt is that let's say we have a ratio 5:10 now the equivalent ratio for this would be 1:2 but what I am not able to understand is - let's say we have a situation in which it is given that the ratio of girls to boys is 5:10 which means for every 5 girls we have 10 boys but if we see the...
2. ### A Practical use of an overall heat transfer coefficient?

Say I have a real counter flow heat exchanger using air and water. I run a test so I know every parameter; mass flow rate of both fluids, surface area, and in and out temps. This is great. Now I can calculate the heat transfer rate, my log mean temperature difference, and overall heat...
3. ### B Is there any practical proof that quantum entanglement really works?

What i mean if we change state/spin at one end it will immediately effect the other. Can we see that live using two camera which may be 10 meter apart so that minium time delay. Is there any video proof exist such kind?
4. ### Understanding GDP and its practical meaning

If a country's GDP is 200000,0000000 USD (too many zeros eh?), and $$\text{GDP} = \text{ Compensation to employees} + \text{Government Spendings} + \text{ Investments}$$ (Closed Economy, for simplicity, I mean for my simplicity not the country's) Why do they call it Compensation to...
5. ### Could we make a practical solar fridge?

In another thread, @Grinkle asked about a solar fridge project. In the end, he decided against it, but it set me to wondering if it could be done for people living off grid. At this point, I really miss our beloved Jim Hardy. Jim would have brainstormed with me, then he might have gone in...
6. ### I GR: Practical Problem Sets w/ Solutions

I have been learning gr on YouTube for the last few months. Most of the videos and the book I have focus on high level understanding. I can do all of the tensor calculus proofs. However simple questions like how you set up a velocity vector or measure proper time in schwarzschild are beyond me...
7. ### Could ceramic coins be practical?

What with copper becoming more and more valuable, and metals used in coins being a non-renewable resource, might it not be practical to mint ceramic coins that contain microdots that would make the coins difficult to counterfeit? Microdots are already being used, for example, in car paint as...
8. ### At last: a practical Energy Harvesting proposal?

I was enjoying my (very short) hot shower this morning and realized that the lovely warm water was flowing over my body (sorry - too much information) only once and then disappearing down the drain. This water - and what comes out of the washing machine, dishwasher etc. could be at a seriously...
9. ### Engineering Practical design of an inverting Schmitt trigger with noise tolerance

This is regarding the positive feedback of an Op-Amp and the inverting Schmitt trigger. This is a typical inverting Schmitt trigger - I need to design the Schmitt trigger such that I have a threshold voltage of around 2V, when my ##+-V_{CC} = 8V##. The slew rate of the Op-Amp allows for a...
10. ### Is gene replacement a practical way to fix random mutations?

Recently I asked if prime editing can be used to reverse the random mutations we accumulate with aging(https://www.physicsforums.com/threads/can-prime-editing-fix-every-harmful-mutation-in-all-our-cells.1003279/) but now I have a different question. Can we simply replace our genes to get rid of...
11. ### Calculate scaled down human model weight for practical experiment

Hello, I need to scale down a human model by 1:20 i.e, i need a human model of 9 cm height scaled down. Help me calculate the weight of the 9 cm scaled down human model. Regards, Viky
12. ### Art I suck at practical art tests, but am excellent at theoretical art exams

Hi everyone, I was quite excellent at STEM subjects at school, but struggled (bad) at art classes. Here's why: At grade 9 of middle school, one of the job (assignment) that I had to perform in weeks was singing Amayadori by Mayumi Itsuwa. I and other students were given photocopies of music...
13. E

### Calculus Practical reference for integration on manifolds

I was trying to look for something that works a lot of examples of integrals over surfaces, volumes etc. in general relativity. Tong's notes and some others are good on the abstract/theoretical side but it'd really be better at this stage to get some practice with concrete examples in order to...
14. ### Why We Learn Reaumur Temperature Scale in High School Physics

Hi, In high school physics I learned how to convert between Celcius, Fahrenheit, Kelvin, and Reaumur scale of temperature. While the first three scales are highly used, why do we learn the fourth scale (Reaumur) when there aren't any practical use of it? Just for formality? Bagas
15. ### Quantum Books on Practical Laser Applications: A Guide for Spectroscopy Enthusiasts

Hello! Can someone point me towards some good books about laser from a practical/experimental perspective (maybe even a review paper). Most books I found spend a lot of time going through derivations and theoretical concepts. I would like to go deeper into that, too, at a point, but for now I...
16. ### A Stress point calculation some practical help

https://www.physicsforums.com/attachments/273785 What are the possible materials (beams, H-profiles) etc that can be used to withstand the pressure of the whole system if there are 12 tonnes of wheat in the pipe at all times? How you would make this system work? There always has to be an angle...
17. ### MHB Practical issue regarding Quaternions

Hi there! I´ve got a practical problem with quaternions which I was not able to solve by my own so far. A machine detects the position and orientation of an object which I get as unity quaternion. I visualize that using matlab, which still works more or less, but I´d like to 'force' the...
18. ### Is calculating the value for momentum rare in practical applications?

Recently I started wondering why there seems to be so few practical/engineering applications where you need to calculate the momentum of something. I must emphasize that I don't mean usage of the concept of momentum or the law of conservation of momentum, but the value of the quantity itself...
19. ### Carbon sequestration, how does it work? Is it practical?

Hi All, I understand carbon sequestration in the simplest sense is capturing and storing carbon. As seen in the title, I'm going to split this into two sections. i) How does it work? I imagine that trees, in a sense are doing this. They take in the carbon from our atmosphere and is stored...
20. ### Water Pressure at the tap and practical Bernoulli equation

Hello, I think I understand how Bernoulli equations works but I am clearly uncertain on some aspects of its application. For example, let's look at the figure below: 1) The static pressure is ##60## ##psi## from the city water supply. There is not flow (tap closed) so the pressure at the...
21. ### Deriving a Formula for Velocity of Ball 2 Based on Mass and Angle of Inclination

Summary: I set it up my investigation as in the image with two independent variables: the mass of ball 1 and the angle of ramp inclination. I released ball 1 and started a timer when it stuck ball 2 then stopped it at the end of the track. I then took the average velocity of ball 2 over the 1...
22. ### Physics Practical Investigation using a mass, a fulcrum and a plank

Homework Statement: Carry out an investigation into the relationship between the mass of an object (m) and the distance from the fulcrum (d) at which it will cause the plank to tip. Homework Equations: You will use a ruler to model the plank and a pile of quarters (6) to model the mass of the...
23. ### Practical application of engineering mechanics dynamics in civil engineering

what is the practical application of engineering mechanics dynamics in civil engineering when civil engineers work on static analysis?
24. ### I Find Practical Resonance Frequencies in Linear Differential Equations

Hi all, I would like to know what is the equation upon which I can use to determine the practical resonance frequencies in a system of second order, linear differential equations. First some definitions: What I mean by practical resonance frequencies, is the frequencies that a second order...
25. ### Studying Do I have to be interested in practical applications to study physics

I'm looking at changing my university degree to go back and study science with a major in physics. I've always had a deep interest in the way the world works and how much of what happens around the world and the universe seems to be governed by simple laws, or some cases not so simple. My main...
26. ### Ocr practical paper question on concept

should n't it be a maximum number to achieve less than 0.5% uncertainty for the last question as you add more disks would there not be more uncertanity therefore as the number of disks for 0.5% is 9.5, 10 would give an unceranity of greater than 0.5% so it should be 9? the answer is 10.
27. ### MHB Are there practical applications for Axiomatized Formal Theories?

The study of these theories is interesting in itself,if only to understand Godel's work. My question concerns their practical applicability to the solution of problems in different disciplines like mathematics, engineering, physics and the like. Are there reasons for studying them beyond the...
28. ### MHB Practical Application of Research Paper help

I am attempting to write a software app based on a research paper: "Predicting Ambulance Demand: a Spatio-Temporal Kernel Approach" by Zhou and Matteson . Here is a link to the paper https://arxiv.org/pdf/1507.00364.pdf . I have questions on how to go about implementing the equations. In...
29. ### B Practical Antimatter Production

Dear All, I read this article Lightning Strikes Produce Antimatter Particles in Earth’s Atmosphere which I find very intriguing and it raises many questions for me, so I will try to contain myself. Here is the accompanying illustration: The first major question is, how did the researchers...
30. ### Melde's Exp: Why Transverse & Longitudinal Arrangements Differ?

Homework Statement Why working formula for transverse and longitudinal arrangement in melde experiment different in Melde's experiment ? Homework Equations None. The corresponding equations are all derived from the same fact. The Attempt at a Solution So, I have understood that the tuning...
31. ### Other Practical book on relational databases with SQL

Hello, I'm looking for a book on relational databases, that uses SQL, that is practical with lots of examples, and the least possible amount of jargon. Specifically, I have issues understanding how to translate the E/R model into the relational model (relations to tables), and the book that I...
32. ### Significant figures in practical investigation report

Homework Statement I am writing a prac report regarding Hooke's Law, and am uncertain how many significant figures I should write my results in in my results table. I have heard that in my prac report, I must keep my significant figures consistent, that is, all data measured by the same device...
33. ### Practical Fluid Mechanics: inversions & mixing

I'm trying to think through a situation, and develop some confidence I've got it right. The situation is a apartment building, about 60'/20m high, with a courtyard in the middle about 60'/20m square. In the middle of the courtyard, is an low exhaust stack, about 8' high and around 8' square...
34. ### I Need a practical example of E=mc^2 with real numbers

Need a practical example of E=MC2 with real numbers Ok, so I understand that Energy = Mass of an Object * Speed of light square, if we must convert this to numbers, how can this be presented for let’s say 1,000 hydrogen atoms? Energy = 1.008 (Hydrogen mass) * 1,000 (hydrogen atoms) * speed of...
35. ### Assistance with practical electromagnetism project

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...
36. ### Find λ of light using a laser beam and a diffraction grating

1. What is the advantage of using class 2 laser light? I would really appreciate if reference source is also given!Homework Equations Not needed.[/B]The Attempt at a Solution Well, I thought that using monochromatic light would made it easier to measure the distance between fringes. And also...
37. ### Developing more practical insights into real situations in Physics

Good Evening Mates, I've been following up with the Forum for a couple of months now, and I've noticed how some of the members are able to give some deep answers for seemingly simple questions. I'm in my second year of undergrad's school, and have studied the basis of Mechanics, Thermodynamics...
38. ### B Practical use of Bose-Einstein condensate?

I'm not a physicist nor an academic, however, the world around me fascinates me. I was watching YouTube and came across an explanation of Bose Einstein condensate, and thought with less space between atoms that would potentially be a better target for creating new elements. So my question is...
39. ### Other Intelligent hands-on job with a physics degree

Hi everybody! So I got a Masters in physics (precisely - biophysics) 5 years ago. Then attempted to get a PhD, realized that research and academia don't feel right to me and quit. Now I'm 28. Despite the lack of the doctoral degree, working in the lab gave me many skills. Biomedical engineering...
40. ### Instrumentation amplifier practical results vs simulation

I just have a simple question to ask. I'm simulating an instrumentation amplifier and then testing it practically. When I simulate it, my gain is 6, but when I test it, I get a gain of 5.54. I'm just wondering what is causing the slight drop in gain in the practical results?
41. C

### Practical method to measure the rate of a luminol reaction

I was wondering how I could measure the rate constant k for chemiluminescence reaction of luminol (when oxidised by H2O2. I was told that I can use a lux meter that measures the intensity of light emitted, but I'm not so sure how this can be done since the equation calculating the rate constant...
42. ### Practical Skills - Recording time with human error

Homework Statement Please could someone help me with how raw data should be dealt with when using a human operated stop watch. I have attached the information we were given and it makes little sense to me. Homework Equations See attachement The Attempt at a Solution We are constantly reminded...
43. ### What are the practical limits of constructive interference?

The "wireless power" thread made me think of this, but I have pondered it before when it comes to microphone arrays etc You can easily find documentation on the interference patterns N in-line sources of waves generate. E.g. The annoying thing here is that you have infinitely extending lobes...
44. ### Courses Intro to Philosophy: Knowledge and Reality or Philosophy: Practical Logic?

Which course do you guys think would be more interesting/helpful for a physics major? They are both 100 level, Intro consists of two lectures and a seminar a week, and Practical Logic consists of a three hour lecture once a week.
45. ### How low can I go with voltage to increase current in a resistive AC circuit?

Simple premise: take ohms law with a purely resistive ac circuit. 1 volt through in series with a 2 ohm resistor, I have 0.5 amps of current. I want to maintain constant power. In practice, "how low can I go" with the voltage to increase the current? There's probably many variables I'm missing...
46. ### B Practical applications of quantum mechanics

What are some of the practical applications of quantum mechanics that are being utilized to optimize our existence as a species?
47. ### I Maximum practical size of a BEC

It's technically very difficult to create BEC's of atoms, using lasers to cool the atoms to near absolute zero, in a vacuum chamber, and it was only first accomplished in 1995, despite being predicted many decades before that. The atom, or molecule, BEC's so far created are, from what I've...
48. ### Practical Physics: Discharging a capacitor

Homework Statement "We will concentrate on the time taken for the capacitor to discharge to exactly one-half of its p.d, and how this varies with the value of the resistor. So repeat the experiment with different recorded values of R, and find the corresponding T, the time taken for V to fall...
49. ### Practical Induction -- What Provides The Most Power?

I'm having a hard time finding a starting point for this question. I'm looking for all the variables that can effect the amount generated by induction, and then hopefully ordering them from the most important to least important. Any references to a good starting point for someone who hasn't...
50. ### I How do you answer "So what's the practical application....?"

I suppose you recognize, by title, the situation I am referring to. I don't know if physics people get it as often as math people. The situation of course is that I tell somebody that I am studying math, and if I mention some specifics, like mention Topology or Algebra, (which I have to sort...