What is Confused: Definition and 1000 Discussions

In medicine, confusion is the quality or state of being bewildered or unclear. The term "acute mental confusion" is often used interchangeably with delirium in the International Statistical Classification of Diseases and Related Health Problems and the Medical Subject Headings publications to describe the pathology. These refer to the loss of orientation, or the ability to place oneself correctly in the world by time, location and personal identity. Mental confusion is sometimes accompanied by disordered consciousness (the loss of linear thinking) and memory loss (the inability to correctly recall previous events or learn new material). The term is from Latin: confusĭo, -ōnis, from confundere: "to pour together", "to mingle together", "to confuse".

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  1. S

    Engineering Confused about which field of Electrical Engineering to Go into

    I am a applied physics major with an emphasis in physical electronics (so basically I take a lot of solid state physics classes with my other normal physics classes), and I go accepted into a program where I start taking graduate classes during my last year of my bachelors (current year) and...
  2. EngUOL

    Confused About Transistors: Pi Hybrid & Small Signal Equivalents

    Hi everyone. I am starting to study transisors at Uni. and I am confuse in some main concepts. i thought about posting it here so someone can help me up. are pi hybrid signals equivalent circuits used with the same porposes as small signals equivalent circuits? or are pi hybrid signals, small...
  3. B

    Textbook error or am I just confused?

    The high school textbook I’m reading says this: Statement A “Many household appliances contain an electrically heated resistor. A resistor is a device that opposes the flow of current and as it does this, heat energy is produced. E.g. electric kettles, electric fires, light bulbs. If we...
  4. B

    Confused on escape velocity derivation

    I'm confused on how you get the formula v=root(2GM/R²). I know you can use work=forcexdisplacement (W=Fd) so F=W/d. W=½mv² and R=d. Hence, F=½mv²/R Equate that to F=GmM/R² and rearrange to get v=root(2GM/R²). That makes sense as it involves the kinetic energy needed/work done in reaching orbit...
  5. fluidistic

    Confused in stat. mech.-thermo., inconsistant result

    Homework Statement Hello guys, Long problem but I'll drastically shorten it. I've a diatomic ideal gas of N molecules (the 2 atoms are distinct). I must calculate the internal energy and the specific heat for high temperatures. I've got the solution but if I solve it my way in the last step, I...
  6. R

    Engineering Why Is Source Transformation Used in Circuit Analysis?

    Homework Statement [/B] Homework Equations There's not much to write here except parallel resistors equation. This is supposed to be a superposition problem. How did he use a source transformation because I have no idea why and where he did the equivalent resistor and why did a current...
  7. PhiowPhi

    Confused, velocity in motional EMF?

    Motional EMF is defined as E = -vBL Where B is the magnetic field in Tesla, L is the length in meters and ,v is the velocity. Lets say we have a distance(1m) where half of it(0.5m)the magnetic field is present. So, there is a wire that moves with constant acceleration throughout that whole...
  8. fluidistic

    Statistical mechanics, confused about an approximation and limits of integration

    Homework Statement Hello, I tried to solve a problem on my own and then I looked up a solution on the web, and I realize that it seems that I goofed. The problem statement can be found at http://www.hep.fsu.edu/~reina/courses/2012-2013/phy5524/homework/solutions/hw5_sol.pdf (Problem 1, part...
  9. S

    How Is Kinetic Energy Calculated for a Raindrop Falling at Steady Speed?

    Homework Statement q)a rain drop of mass m is falling vertically through air with steady speed v the rain drop experiences retarding force kv,,k is constant,,acceleration of free fall is g,,k.e of drop is a)mg/k b)m.g^2/2k^2 c)m^3.g^2/k^2 d)m^3.g^2/2k^2 e)m^2.g/k Homework Equations...
  10. C

    Confused why both answers are different. P = F.v

    Homework Statement A fire hose for use in urban areas must be able to shoot a stream of water to a maximum height of 34m . The water leaves the hose at ground level in a circular stream 3.0cm in diameter. What minimum power is required to create such a stream of water? Every cubic meter of...
  11. L

    Standard deviation translation property proof - confused with property

    I need to prove that $$std(x+c) = std(x)$$ I have been trying to use the properties of the mean such as $$mean(x+c) = mean(x) + c$$ I am confused on the following property of the mean, is this statement correct? $$\sum\limits_{i=1}^{i=N}(x_i - mean(\{x\}))^2 = mean(\{x\}) \\$$ If that is...
  12. A

    Confused about what to do in College

    As a senior in High School in Chicago, I was planning on pursuing a Masters Degree in physics at University of Illinois at Urbana Champaign. That being said I had a few questions about the career (I don't know any Physicists personally to ask): 1. How easy is it to find a job with a Bachelor of...
  13. I

    Equation of a Plane Wave, confused

    Plane wave equation: $$\psi(t) = \psi_0e^{i(\vec{k}\cdot\vec{r}-\omega t)}$$ The part that makes the domain of \psi(t_i) a plane is the k dot r part. I'm reading a book that takes this term and imposes the following condition: $$\vec{k}\cdot\vec{r}=Const.$$ which, i understand its...
  14. P

    MHB Confused about law of total variance

    Ok, so I got this question on an exam some time ago and I still don't understand why I didn't get it (I can't remember the exact question, but this is very similar): "A lottery winning amount is determined in the following manner: first a die is thrown. If the result is 1 or 2, the lottery...
  15. M

    A Bit Confused About Polar Basis Vectors

    Let me say from the beginning I'm not talking about the non-coordinate unit vectors for polar coordinates. I'm talking about basis vectors. Let me just ask it as boldly as possible: how does one use these basis vectors in order to describe a vector? I know they are different at every point, so...
  16. P

    Confused about answer key's solution to a work/energy problem

    I'm studying for my college's physics placement and I'm frustrated because I don't get the solution to problem 1d. Homework Statement The problem is here: http://ocw.edu.ht/courses/physics/8-01-physics-i-classical-mechanics-fall-1999/exams/exam_2.pdf Solution manual is here...
  17. C

    Hello I am confused calculating torque

    PLz find the attached image. Each link weight is given. the 50 kg weight with link rotates about the red hinge point. angle is as shown. please help me out its urgent. need to calculate the torque about the red hinge point.
  18. Dethrone

    Does F(x) = F(x) - F(a)? Confused!

    This is going to be a really dumb question, but somehow it's not really clicking. I read somewhere that: \int_{a}^{x} f(t)\,dt = F(x) - F(a) But, this is also true: F(x) = \int_{a}^{x} f(t)\,dt. Does this imply that F(x) = F(x) - F(a)? For example, at a random number, c,: F(c) =...
  19. D

    Confused about wavefunctions and kets

    Hi. I am confused about the following problems. Any help would be appreciated. Thanks 1. I don't understand what ψ (r)= <r|ψ> means. What is the difference between the wavefunction ψ and the ket |ψ> ? 2. A similar equation is ψ (p) = <p|ψ>. Is this ket |ψ> the same as the one above or is...
  20. S

    MHB Calculating Area: Exploring the Bounds of Trigonometric Functions

    Sketch the region bounded by the line y = 2 and the graph of y = sec^2(3x) for \frac{-\pi}{6} < x < \frac{\pi}{6} Very very confused on this problem... So here is what I set up.. Top function - bottom function \int ^{\pi/6}_{-\pi/6} 2 - \sec^2(3x) dx so I split the integrals in two. for...
  21. V

    Confused about formal definitions of probability theory

    I think the first thing that is confusing me is the terminology. There are too many similar terms (e.g. probability measure, probability distribution, probability density function, probability mass function) What are the general concepts and what are the instances of those concepts? Like, are...
  22. D

    What is Menshikov's Theorem and How Does it Relate to Percolation?

    Hi, I am trying to learn some stuff about percolation, specifically what Menshikov's theorem is about. On wiki http://en.wikipedia.org/wiki/Percolation_theory it says: "when p<pc, the probability that a specific point (for example, the origin) is contained in an open cluster of size r...
  23. J

    Integration - slightly confused

    Hi I'm trying to integrate the following q_m = -D A \frac{dc}{dx} where A = 4 \pi r^2 Yes, a sphere.My supplied literature simplifies to q_m = -D 2 \pi r L \frac{dc}{dr} when A = 2 \pi r L Integrating to \int_{r1}^{r2} q_m \frac{dr}{r} = - \int_{c1}^{c2} 2 \pi L D dc Integrated to q_m ln...
  24. FysixFox

    A tad confused about gravitons

    I'm a bit of a non-classical physics newbie here, so let me check my (rudimentary) understanding of some things first. In quantum physics, there are the leptons, quarks, and bosons. All particles are excitations of a field. Bosons in particular are the fields that mediate different kinds of...
  25. Infinite/Zero

    Confused High-Schooler Seeks Help Understanding Volt

    I am a high-school student. My Physics's teacher is not good,so I am here. Please anyone explain me "What is volt", so that I will have no confusion with Volt. I will be thankful to you if you clear my confusion.
  26. 1

    Why are there only 3 quartiles when dividing data into 4 equal parts?

    My professor stated the following: "Dividing in pieces is called 'quantiles'. In almost all cases quartiles are used, where n=4. We divide it into four equal pieces and we are going to check where the margin values are. Pay close attention: if I split my data into 4 equal pieces, I will have...
  27. B

    Interest Vary and its making me confused

    I'm a freshmen college student pursuing a chemical engineering degree. I have many ideas that I want to create ranging from food processing, recreating the future of human performance equipment, ocean discovery, computer programs, and more. Will majoring in chemical engineering be best suited...
  28. N

    Is This Set a Spanning Set for R3?

    Homework Statement Is {(1; 1; 0);(0; 0; 2);(0; 0; 1);(1; 2; 3)} a spanning set for R3The Attempt at a SolutionThis is supposed to be easy but the answer sheet might be wrong. The answer I have says it is and then proceed to say that (0;0;2) is linearly independent. But it isn't because...
  29. T

    Centre of mass and gravity problem, confused and

    Homework Statement A uniform plank of length l = 6m and mass M= 90kg rests on sawhorses separated by D = 1.5m and equidistant from the center of the plank. Cousin Throckmorton wants to stand on the right-hand end of the plank. If the plank is to remain at rest, how massive can...
  30. M

    Confused with my prospective advisor

    Dear all, Please I need your help and suggestions I contacted a professor for a PhD program in electrical engineering. First, he asked me to send him some documents (CV, transcripts,...etc). Then, he told me to apply for the university. Unfortunately, my application has been rejected...
  31. M

    Horribly Confused With Complex Logarithms

    I'm getting myself all confused with complex logarithms. I'll try to explain why. One identity with complex logarithms is ln(z^c)=cln(z)+2πik, with k an integer. This is, of course, a more general case of ln(e^c)=c+2πik, but it doesn't always work the same! Let's say we are evaluating ln(e^i)...
  32. D

    Thoroughly confused on self-inductance

    I am havingA LOT of trouble with self-inductance and have spent 10+ hours watching videos on youtube, and I'm still getting nowhere. From what I understand: self inductance = the ability of a thing (not sure what) to resist the change in voltage (and thereby causing current to change more...
  33. C

    Why Does Gauss's Law Use Cylinder Circumference Instead of Area?

    Homework Statement So I was looking at this site reading up again on Gauss's Law and was a tad confused http://hyperphysics.phy-astr.gsu.edu/hbase/electric/elecyl.html 1st thing on the page... Homework Equations The Attempt at a Solution It states that the electric flux will just be the...
  34. T

    Confused about conservation of energy

    Why is it that when you drop something on a spring, that item dropped on the spring does not bounce back up to where you dropped it from?
  35. D

    MHB Confused by this probability question

    I came across this problem and I'm wondering if anyone can tell me what it means/how to do it: "Given the formula below to model, what is the expected value of rolling two dice simultaneously? $$E(X)= \sum_{i=1}^{\infty}x_i f(x_i)."$$ I've never seen this notation before; how does it work?
  36. T

    Confused about what the standard order is?

    In my previous two math classes I'd get the answer wrong if I put the number first then the variable as my answer. Now in this class this way of doing it is wrong. I'm seriously confused now. For instance the last two classes said that it was standard practice to write an answer like: 3x+4. This...
  37. Feodalherren

    Green's theorem - confused about orientation

    Homework Statement ∫Fdr Over C where C is the cirlce (x-3)^2+ (y+4)^2=4 F=<y-cosy, xsiny> Homework Equations The Attempt at a Solution So I applied Green's theorem and converted to polar and ended up with -4π, it should be positive. The orientation confused me since day one...
  38. gfd43tg

    Confused about a Problem Statement - Seeking Help

    Hello, I have the problem statement attached in the thumbnail. I am confused about this question. I looked at the solution manual, and they are saying that the pressure at states 3 and 4 are the same, as well as at states 1 and 2. I don't see how this is. Looking at the carnot cycle PV...
  39. E

    Solving Momentum and Impulse Questions: Help Please!

    I am very confused on these questions...help please :) stuff in () is what I think the answer is but am not sure. A 100 kg cart and a 200 kg cart move toward each other. The 100 kg cart initially moves at +5 m/s while the 200 kg cart moves at -10 m/s. 1. What is impulse in terms of...
  40. E

    What is the role of torque in rotational motion?

    Homework Statement http://postimg.org/image/mzdo4kp7b/ wouldn't the initial angular speed of 50rad/s cause some rotation about the axis at B (so shouldn't the FBD include a torque about B?) http://postimg.org/image/nad9b9rqn/ And in this question, I don't know what Mz is. Is it...
  41. T

    How Do You Determine Direction in Hypothesis Testing?

    Homework Statement For example in my notes in class the prof went over an example with the following null and alternative hypothesis: I feel like you can switch them around but I am not too sure. I have been trying to figure out when to use greater than or less than for the null...
  42. B

    Confused about string instruments and standing waves

    So I made a banjo for my project and now I need to do the calculations. Well since its a string instrument I have to find the frequencies of the first four harmonics, I already have the fundamental frequency. Is it fine to use: fn = nf1 Not sure because I thought that was for open end air...
  43. T

    Confused about mean and standard deviation for samples

    Homework Statement Here is a slide in my notes: I am kind of confused about mean and standard deviation. So in my notes it says X1 to Xn are independent measurements. Then it says each independent measurement has a mean μ. But how is this possible, if they are independent measurements (in...
  44. C

    Correlation confused on integration

    x(n)=exp(i(x*n+theta1)) +exp(i(y*n+theta2)) x and y are constants , theta1, theta2 are uniform random on [0,2*pi] R(f) =E[{ exp(i(x*n+theta1)) +exp(i(y*n+theta2)) }exp(-i(x*(n-f)+theta1)) +exp(-i(y*(n-f)+theta2)) }] = 4 products 2 of which will be similar but with the opposite constants...
  45. Giant

    Confused between mathematical physics and theoretical physics

    Hello! This is my second thread in here. I'm just finished my high school and waiting for the results to get admission in an undergrad physics program. I was confused about career guidance and academic guidance feel free to move my thread if I'm in the wrong place I was wondering about major...
  46. P

    MHB Indefinite Integral using Trig Identity i'm confused

    Okay so I'm working on this problem \int \frac{x^2}{\sqrt{4 - x^2}} \, dx I do a substitution and set x={\sqrt{4}}sinu I get to this step fine \int 4sin(u)^2 I know that u = arcsin(x/2) so I don't see why I can't just substitute in u into sin(u)? I tried this and I got \int 4 *...
  47. S

    Confused about Kirchhoff's Laws for RC Circuits - Discharging

    Hi. When trying to derive the equation for voltage across a discharging capacitor in series with a resistor using Kirchhoff's laws, I got stuck. My attempt was that the voltage gain across the capacitor should equal the voltage drop across the resistor, therefore q(t)/C = i(t)*R, or q(t) -...
  48. applestrudle

    Confused about negative charges in potential field of a pos charge?

    do negative charges in electric fields of positive charges have negative electrostatic potential energy? am I write in thinking they can't be at negative potential (V) because potential is a property of the field and has nothing to do with the charge in the field (like potential energy does)...
  49. T

    Confused - nucleosynthesis of carbon

    Confused -- nucleosynthesis of carbon May I ask a question please! I read that nucleosynthesis of carbon was rapid because its one of the excited state energies was only a little higher than the total energy of Be and He. So, the required energy could be obtained through the kinetic energy of...
  50. D

    Understanding Back EMF: How It Affects Motor Performance and Power Consumption"

    I need help in understanding back emf, I'm a bit confused here. Example(for understanding): Let's assume we have a 12 V DC motor, that draws 20Amps when it starts, as it reaches maximum speeds, current drops due to back emf, let's assume the resistance is 0.6 ohms, and b.emf = 10V...
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