Confused Definition and 1000 Threads

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. B

    Confused kinematics equations & ball motion in the air

    you throw a ball straight up in the air with a speed of 7.25m/s. The moment the ball leaves your hand you start running away at a speed of 2.59m/s. How far are you from the ball the moment it hits the ground. So I've gotten better at these kinematics equations but this one has too many...
  2. BWV

    Confused about Lorentz Transformations

    I thought Lorentz Transformations left Δt2-Δx2 invariant but, for example a frame moving at .5C for Δt =1 has Δx = .5 so Δt2-Δx2 = .75 If this is transformed by : to a rest frame Δt =0.65 has Δx = 0 and Δt2-Δx2≠ 0.75 not sure where I have gone wrong here, any help would be...
  3. T

    Master Thesis, confused and overwhelmed

    Hello everyone and thanks a lot for reading! A short introduction: My name is Tomer, 26 years old. I'm an Israeli doing his masters in Germany, Potsdam, with a specialization in astrophysics. I've done my bachelor (in maths and physics) in Israel (the Technion). Now, after I finished my...
  4. B

    Confused chemE major Please advice

    Well, I graduated in May with a degree in chemical engineering with minor in mathematics and CS from a small college in TN, (gpa 3.75) with 20k in debt . I have just received my green card 2 months ago. Previously I was on student visa, thus I could not allow to work off campus / also I could...
  5. J

    So im a little confused about string theory will give us unification

    Could someone give me a short summary(if possible) of how discovering matter is made of vibrating energy will give explanation to all four fundamental forces?
  6. C

    Confused about the nomenclature of this compound (CrO3)

    So I'm a little confused about the nomenclature of this compound (CrO3). is it chromium (VI) oxide? chromic acid? and then Cr2O3 is just plain Chromium (III) oxide right?
  7. M

    Java Confused about Java and Glassfish

    Hello, I just downloaded the Java Development Kit (J2EE) and during the install I was asked to configure something called Glassfish. I don't understand what Glassfish is for. Is it only for Web development? What does it do for me?
  8. J

    Confused about some aspects of GR

    Hey all, GR has just been explained to me in a lecture and I'm a little confused about a few things. I've been running through a few scenarios in my head and I don't see how they can occur without a paradox. One scenario is if you have two spaceships traveling parallel to each other at...
  9. D

    Breathing against a fan/pressure I'm confused any help would be great

    Breathing against a fan/pressure ... I'm confused... any help would be great Hi all, This post is in relation to breathing on a CPAP device which is commonly used to treat sleep apnea. What I am confused about is the effects of changing the pressure and the perceived affect on comfort of...
  10. G

    Understanding Vector Spaces in Real Analysis

    Hi, I have this problem that is solved, but I don't understand the theory behind it. It says: Which of the following sets, with the natural definitions of addition and scalar multiplication, form real vector spaces? A) The set of all differentiable functions f:(0,1)\rightarrow\Re such that...
  11. A

    Medical My Childhood Seizure Story: From Ambulances to Anxiety

    when i was 14 and my mom walked in my bedroom and turned the light on to wake me for school she couldn't wake me up and my eyes were rolling in back of my head she tried walking me around but my body was limp she called ambulance but i was fine by the time they got there they took me to the...
  12. S

    Confused about derivatives of inverse functions

    Hi. I am reviewing for an exam, and this is a topic that I did not go through very thoroughly. I understand how to calculate the derivative of an inverse function when I am given a point, as I simply use the equation (1/f((f^-1))'. So if I am given the equation y=x^3, for example, and am asked...
  13. G

    Confused with directional derivative definition of vectors

    Hi, been reading about GR and am quite confused about the new definition of vectors. My main problem with this is that the text uses partial derivatives as the vector basis, I understand this is related to directional derivatives but cannot see the direct mathematical relation. Secondly, how...
  14. M

    Confused about PID controller for current control with PMW

    Hi, I'm looking into the control of a PMSM (permanent magnetics synchronous motor) motors using H-briges and PWM (puls width modulation). I'v seen motor controllers that use a PID controller for speed regulation. The output of the PID controls the PMW. This makes sense to me because the PMW...
  15. G

    Confused about the metric tensor

    Now let's say I have the metric for some curved two surface ds^2=G(u,v)du^2+P(u,v)dv^2 ( the G and P functions being the 00 and 11 components, assuming the metric is diagonal) Now my question is, since the metric defines the scalar product of two vectors, let's say (1,0) and (0,1), for...
  16. S

    Confused about a derivation of Poynting's theorem

    I (and probably everyone) like to learn from books that describe the reasoning/philosophy behind the equations as much as possible, instead of "pluging this in and getting that" or even just dishing out "clearlys". There's a footnote to the word "clearly" in some online LaTex tutorial...
  17. T

    Confused about logical statements.

    A and B or C Does that even makes sense as a statement? I thought logical operators are binary. Obviously, the "or" links to C but what is on the other side? A or B? i mean 1+2-3=0 makes sense since (1+2)-3=3-3=0=1-1=1+(2-3) But [(A and B) or C]=(AorC)and(BorC) [ A and (...
  18. T

    C/C++ Confused about logical statements in C++

    Maybe this should belong in the logic section. But since this is C++, ill put it here. bool isLeapYear( int y) { return y%4==0 && y % 100 !=0 || y% 400==0 ; } They said it returns when y is divisible by 4 but not by 100 unless it is also divisible by 400. This is a bit...
  19. G

    Why is the gradient of a function considered a one form in Schutz's book on GR?

    So as I have read in Schutzs book on GR, and I'm finding his section on tensors and one forms very confusing. Schutz describes gradients of functions as a one form, I cannot quite grasp why. In calculus I was taught that the gradient was a vector pointing in the direction of the fastest...
  20. T

    Size of the Universe? I'm confused.

    I have to preface my questions by saying that I have only a little better than a high school understanding of physics; as such I humbly ask that any answers be termed in a way that I'll be able to understand them. I've read that the universe has a radius of ~ 46 billion light years. And we...
  21. C

    Programs Confused about tuition and stipends for science Masters/PhD programs

    So from looking at a lot of universities' graduate programs for science Masters and PhD's (physics, engineering, materials science, chemistry, molecular biology, etc), a lot seem to offer pretty good stipends (in the $20,000 - $30,000 range) if you enter a research-based program and do research...
  22. A

    Confused about method to approximate a decimal number.

    Homework Statement I need to approximate the number 14.45 to nearest integer. Homework Equations The Attempt at a Solution If I remember correctly, to approximate a decimal up to say 2nd decimal place, I look at the third digit and if this is greater than or equal to 5, then I...
  23. I

    Confused about continuity and limits

    Hi guys, I just started reading an introductory book on analysis. I'm up to the part where they talk about functions now, and I'm getting lost. The theorem that I'm having trouble envisioning is: Let f: D-> R and let c be an accumulation point of D. Then limx->cf(x)=L iff for each...
  24. P

    Confused about +- symbol use in inverse function

    Hi, so this isn't a question, it's just an example that they've given, but I don't understand the explanation given. You have : y = x^2 - 4 x = y^2 - 4 y^2 = x + 4 y = ± sqrt(x+4) I don't get why there is a ± symbol there. My book says that it's necessary because there are two...
  25. L

    Confused about image size in plane, concave, or convex mirrors

    So I know these equations 1/f = 1/p + 1/i m = -i/p f: focal length p: object distance from mirror i: image distance from mirror m: magnification Let's say that I have an object in front of a concave or convex mirror with the same |f|. p is much larger than the radius of curvature...
  26. R

    I am confused with this equation derivation

    Hello, please take a look at the image below: http://tinyurl.com/cnz2sut I am confused as to how that square root transformed into 3/2 power... Isn't it suppose to be 1/2 power if it's a square root? Thanks
  27. B

    Confused about what my exam board wants

    I'm doing AQA Physics A unit 5 next Monday, and I've been doing some past papers but I'm not sure about how to answer questions on the energy released in nuclear reactions. The mark schemes say that the energy released is equal to the change of binding energy per nucleon but I thought that the...
  28. C

    Little confused about raising a complex number to a power.

    Homework Statement α=2e3∏i/4 find α11 in cartesian form. Homework Equations The Attempt at a Solution It's been a while since I've done these but from what remember you add 2kpi to get exp in the range of -∏,∏. so if I let k=15 I get e3∏i/4 but the sltn says it...
  29. E

    Faraday Lenz law are just getting me more confused

    I am sick of searching and being confused more and more specially about lenz law... THere are many demonstrations and many law.. Can someone list atleast the most important one...
  30. K

    Confused with pressure in closed-box

    I'm confused when i consider about this picture in my head. ... imagine that there is a ''closed-box'' on the floor. And ball A is in this closed-box. Pressure acted on the box = Patm. I'm wondering, how much pressure act on ball A ? With my sense, i think it is Patm. ... but i can't...
  31. E

    Automotive Is the Persu V3 Hybrid's Opposite Teardrop Design More Aerodynamic?

    So I started researching about aerodynamics and found that the most natural aerodynamic thing is a teardrop, it has a very low coefficient of drag so cars had been made to also have aerodynamics like a teardrop but looked horrible so no one bought them but engineers now decided to make a more...
  32. S

    How Does Friction Cause the Bottom Block to Move with the Top Block?

    Homework Statement a 2 kg block rests on a horizontal frictionless surface, and is initially at rest. a 1 kg block rests on top of the 2kg and initially moving at v=3m/s (to the right). the coefficients of friction between he two blocks are MUs=.2 and MUk=.1 . A force is applied to the top...
  33. m4r35n357

    Confused about curvature of vacuum solutions

    When I first started learning about GR, I understood that a vacuum solution is one where the Einstein tensor vanishes, for the simple reason that the stress-energy tensor, T, vanishes. I have since read many times that the Ricci tensor vanishes for a vacuum solution. I am confused because to...
  34. A

    Understanding Eigenvectors: Troubleshooting and Verification

    Hello people! I am having a bit trouble with verifying my result when i compute the eigenvectors for the following matrix: A=[[3,4],[3,2]] I know for sure that the eigenvalues is respectively -1 and 6, so i start finding a solution for the following null spaces: 1)...
  35. S

    Confused about Linear Predictive Coding (LPC)

    Hi I'm taking a multimedia systems course and I'm preparing for my exam on tuesday. I'm trying to get my head around LPC compression on a general level, but I'm having trouble with what is going on with the linear predictive filter part. This is my understanding so far: LPC works by...
  36. Q

    Confused about the formation of Stuff in an Isotropic-ish Universe

    Confused about the formation of "Stuff" in an Isotropic-ish Universe First let me state my current understanding so that I can be corrected if not on the right page-- Given "zooming out" far enough, our universe is rather homogenous/isotropic, but not perfectly so. If this is correct, I must...
  37. E

    Is There an Error in Converting I2 from Phasor to Time Domain?

    So we're converting these currents from phasor to time domain with ω=4. I understand I1, but not how the lecturer got I2, is this an error with the notes? We have these phasors: Which are converted to this time domain (respectively): Any help is much appreciated.
  38. T

    Why Measure Velocity Dispersion in Elliptical Galaxies?

    Hey guys, stupid question probably, but I somehow don't get it. I'm just reading an article about dark matter in elliptical galaxies. They mention at a certain point that while for the detection of DM in spiral galaxies we measure the rotational velocity of its stars around the center, for...
  39. I

    Confused about E-Z Isomerism Q9) - Butane

    I know what E-Z isomerism is, but I'm confused about Q9), couldn't the answer just be all of them? FOr 10, I know its but- since there are 4 carbons in the chain but how do I know which of the options are wrong? Thanks
  40. D

    Studying Probability, confused about Combinations.

    Homework Statement Suppose 5 cards are dealt at random from a well shuffled, 52 card deck. The hand can be thought of as a random sample size 5 from 52, with no replacement. What is: (a) P (4 aces) (b) P (3 aces and 2 kings) (c) P (4 of a kind) Homework Equations I know the...
  41. P

    Very, very confused and doubting myself

    alright, well here's my story (sorry for the long read, heads up now lol :P) in high school, i did absolutely no work at all. i pursued all the sciences however and did fairly well in biology and chemistry as well as math (advanced functions and calculus). thing is, never had an interest in...
  42. R

    Advice for High School Senior Seeking Career in Science

    Hello, and greetings! I am a senior in High School, but had the revelation this year that I want a career (and education) in science. I've narrowed down my interests as best I can, but my area of interest is still fairly broad. I'm aware that this post includes career advice, but it is tied...
  43. D

    Confused about simple max{,} notation

    I'm working on a project that required me to go through the literature to find some information on Compton and Rayleigh scattering. I came across a key expression, part of it which read: max{ f(x,Z), g(x,Z) } if Z > 10 and f(x,Z) < 2 where f(x,Z) and g(x,Z) are known functions. The...
  44. N

    Confused About Acceleration Vector Direction on Test

    Homework Statement This was a question on my test. I had to choose the direction of the acceleration vector for each position. I was wondering if I chose the correct answers. Homework Equations a = gsinθ ƩF_{y} = N_{1S}( normal force) - W_{1E} ( weight force) The Attempt at a...
  45. Femme_physics

    Conflicted and confused which engineering profession best fit my dreams?

    I'm so confused lately :( I want to get into a field where we integrate chips with the brain, or try to make neurons interact with engineering devices. Problem is I don't know what field fits best. Which would you recommend me, based on experience? Medical engineering seems like the ideal...
  46. L

    Confused about reference frames

    Ok I'm really trying to understand inertial and non-inertial reference frames, my understanding is as follows: A rest observer on the earth, the observer will be stationary relative to the earth.. Now as I understand it an inertial reference frame is one of which 2 coordinate systems are both...
  47. R

    Hey im so confused about moment of inertia. ?

    I=mr^2 I know moment of inertia depends on how for a object how far a bit of mass of that object is from the axis of rotation. i.e. farther from the axis = higher moment of inertia-= more torque is needed to cause rotation. this just doesn't make any sense for the seesaw example, on the seesaw...
  48. C

    How Do You Derive f(x) = 1/(ln(x)^2)?

    Homework Statement Find the derivative of f(x): f(x)= 1/ ((ln(x)^2)) Homework Equations f(x)= ln(x) f'(x)= 1/((ln(x)) The Attempt at a Solution Dx(1/ln(x)^2) = Dx((ln(x))^-2)= -2*(ln(x)^-3) * Dx(ln(x)) = -2*(ln(x)^-3) * 1/x = -2/(x*ln(x)^3) Are these the correct...
  49. G

    Confused with working out the span of a set of vectors in R^2

    Hi everyone! I have the following problem which I don't understand... It is already solved, but there are three questions I have regarding it. The problem says: "Let S be the set of all vectors x=(x_{1}, x_{2}) in \Re^{2} such that x_{1}=1. What is the span of S?" And here is the answer...
  50. M

    Problem related to work Confused between two answers.

    Homework Statement How much work must you perform to lift a 5 kg bag from the floor to the countertop, 1 meter above the floor? 2. The attempt at a solution A. You could say that any force greater than the weight of the bag would lift it up. Thus, the weight is 50 N and the force...
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