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. U

    Confused about direction of air resistance (linear and quadratic)

    Homework Statement Here I have drawn for the following scenarios: Linear Resistance FR = -k\vec{v} a)Free-fall starting from rest, downwards as positive. Now it gets trickier... b)Free-fall starting from rest, upwards as positive. My reasoning is as such: Since the...
  2. M

    Normalization of photon pulse. I'm confused

    Hi, Let's say I have a creation operator that creates a photon in some spatial mode. It has a spectral distribution given by f(\omega_{k}) So we have \mid 1_{p} \rangle=\int d\omega_{k}f(\omega_{k})a^{\dagger}_{k}\mid 0 \rangle Normalization implies that \int d\omega_{k}|f(\omega_{k})|^{2}...
  3. D

    Confused about direction in angular momentum

    Homework Statement Alright apologies I could not attach an image due to my inexperience of this but its simple to imagine. Imagine a stick which can rotate about the centre of its axis, perpendicular to its length. I.e the ends can rotate freely in a clockwise, or anti clockwise manner...
  4. S

    Confused about why beta plus decay happens

    For β- minus decay Q = m_x - m_y Whereas for β+ Q = m_x - m_y - 2m_e Where the masses are atomic masses, x and y are the parent/daughter. The SEMF can be used to find a parabolic curve showing the mass excesses for an A isobar for particular values of Z, and thus show at which Z the atom...
  5. C

    Confused with what to do with my career

    Confused with what to do with my career-CCNA or Engineering? Hi I am very new in this forum.I am leading a miserable life because of past faults.I don't want to get into much details- I am a 36 yo old man from Calcutta,India.I am a plain Bsc(General) graduate.I had no honors/specialization & my...
  6. P

    Confused about forces - can anyone help?

    In the first diagram below, there is a horizontal board and it is attached to a vertical board via a pivot, P, but is also hooked via a nail (red), and the vertical board is resting on the ground. If I am pulling on the horizontal board with force Fp, and the whole setup doesn't move, then...
  7. D

    Confused by "mv^2/L" - Average Force on Wall in Box

    Hey guys! I find it confusing to prove "mv^2/L", the average force acted by the air molecules on a wall in a box. My textbook tells me an assumption "the time during each molecules colliding with the wall of the container is negligible compared with the time elapsed between successive collision"...
  8. nomadreid

    Confused about the principle of least action

    To make the confusions both concise and explicit, I will put down some incorrect calculations, and ask for corrections Take the Lagrangian KE - PE = T - V Action = S=∫ L dt (with given limits) Principle of least action: δS= 0: S(t1)-S(t2) =0 if t1-t2 is small (using the (.) as function...
  9. J

    Confused about Bogoliubov transformation

    So I was told by my teacher today that I am doing the bogoliubov transformation wrong because I'm supposed to have 4 different vectors, i.e Instead of Ak and Bk A1k A2k and B1k B2k I'm wondering how this makes sense. I've seen papers with 2 different vectors and their complex...
  10. S

    Engineering or Medicine: Which Path Should I Choose for University?

    Really confused, need advice :( Hi, Most of you have much more experience than me, you went through the decision making process before uni so I really hope that you can help me here. I am in my final year of high school, got about 10 month left before my final exams. I am doing extremely well...
  11. T

    Confused about Taylor Expansion Strategy

    In many of my physics classes we have been using Taylor Expansions, and sometimes I get a bit confused. For example, I feel like different things are going on when one expands (1-x)^-2 vs. e^(-Ax^2), where I just have some constant in front of x^2 to help make my point. To keep things simple...
  12. D

    Integrals look easy but I'm still confused

    Integrals...look easy but I'm still confused :( Homework Statement evaluate the integral ∫(36/(2x+1)^3)dx Homework Equations dx^n/dx = nx^(n-1) The Attempt at a Solution ∫(36/(2x+1)^3)dx = 6ln[(2x+1)^3]/((2x + 1)^2) ( I know this is wrong, but why??) ∫(36/(2x+1)^3)dx =...
  13. G

    Confused about: g(x) = (x - 1)^2

    I am revising on sketching curves. But I am very confused about the following even though I have become very good at sketching graphs. An example from the book is: Given that: i) f(x) = x^3 ii) g(x) = x(x - 2) Sketch the curves with equation y=f(x + 1) and g(x +1) I don't...
  14. E

    Im so confused about electromagnetic induction. Need help please?

    I first thought that electromagnetic induction disobeyed the law of conservation of energy since there is another current created by another current by changing it (AC). but then there is Lenz law that says when you have yourself an current and also a changing magnetic flux, there will be an...
  15. R

    What is the weight of the wretched Bananas in Newtons? I'm so confused

    What is the weight of the wretched Bananas in Newtons? I'm so confused... Ok so I tried to list out all of the stuff I was given. Spring constant: k = 16.0 N/m Amplitude: A = 0.2 m Maximum speed: v = 0.434 m/s Maximum Kinetic Energy = Maximum Spring/Potential Energy (1/2)mv2 = (1/2)kA2...
  16. M

    I'm confused about this integral

    i'm trying to prove - or disprove ! - the following : -\ln x\frac{\left \{ x^{1/n} \right \}}{2n^{3}}=\frac{1}{2\pi i}\int_{-i\infty}^{i\infty}\frac{s}{\left((ns)^{2}-1\right)^{2}} x^{s}ds where \left \{ x^{1/n} \right \} is the fractional part of x^{1/n} for x\in \mathbb{R}:x>1 , n\in...
  17. M

    Confused with resting membrane potential

    hello world long time no see..actually I've been very confused with this resting membrane potential I've sooo many questions but i'll only ask one question for now .at rest the membrane of nerve cell is permeable to potassium , potassium goes outside the cell along its concentration gradient...
  18. G

    Confused about Special Theory of Relativity?

    Hi, I have a question (or maybe more) about special relativity. I'm reading The Fabric of the Cosmos by Brian Greene right now, and what I got from one of the sections is confusing. I might be understanding it wrong, or maybe what he's saying is wrong, or maybe it's just right. So this is what...
  19. L

    Find Center of Mass for an open box Confused about steps for this problem

    Homework Statement An appliance box has a square base with sides of length L, and has rectangular sides with a height of 3L. The top of the box is missing. The box is made from cardboard of uniform thickness and density. What is the height of the center of mass of this open box, with respect...
  20. T

    Confused about the answer given by vcaa on electric power

    hello! I was going over some questions on the vcaa site and there was this question in the year 2006 physics exam two. It was question ten. Here's the question (page 7 question 10) http://www.vcaa.vic.edu.au/Documents/exams/physics/2006physics2-w.pdf The answer said that in order to find...
  21. C

    Is pH Affected by Negative Ions in a Solution?

    1. If the statement ph=-log([H+] is true, then how come a solution can be acidic when carbonate is present? I have been told that even if carbonate does not accept H+ the solution will still be basic just by the presence of CO3(2-)? The confusion is this: ph only depends on [H+] then how come...
  22. N

    Conservation of momentum problem. Very confused Speed of Bullet?

    In Fig. 9-58a, a 3.50 g bullet is fired horizontally at two blocks at rest on a frictionless table. The bullet passes through block 1 (mass 1.20 kg) and embeds itself in block 2 (mass 1.80 kg). The blocks end up with speeds v1 = 0.630 m/s and v2 = 1.40 m/s (Fig. 9-58b). Neglecting the material...
  23. S

    Extremely confused about EQS boundary conditions

    I'm having a tremendously hard time understanding the connection between macro and micro scale electrostatics and how (if?) they're described EQS boundary conditions. I understand that in a medium with mobile ions, an applied current or field will lead to the establishment of an electric double...
  24. W

    Confused about Maxwells Equations in potential formulation

    As i understand it, the Maxwell equations in potential form (in the Lorenz gauge) are basically 4 independent wave equations for the 3 components of A and the 1 component of Phi, with J and ρ acting as source terms: Now from the usual formulation of the Maxwell equations and from experience...
  25. C

    Does a Nullspace Spanned by the Zero Vector Indicate Its Dimension Is Zero?

    I am a little confused about dimensions, if the nullspace of a matrix is spanned by the 0 vector, does that mean the dimension of the nullspace of this matrix is 0? In the problems I attached, both A and B reduced to the identity matrix. Note (2) is supposed to be dim(N(B)) and dim(col(B))...
  26. K

    Confused: What to do after Master's?

    Confused: What to do after Master's?? Hello Everyone. I am currently enrolled as a Master's student with bachelor's in mechanical engineering. I am now in my final year. But i have remained confused over what to do after my master's. I am confused between taking up a job, entrepreneurship(i am...
  27. sankalpmittal

    Confused regarding conservative and non conservative force

    Confused regarding conservative and non conservative force... Ok , so here is my explanation : Suppose I take a box at a height 5m from a reference point upwards. Work done by gravity on the block is -mg(5) J. Upwards is taken as positive and downwards as negative. Then I again take that box...
  28. V

    Confused about definition of wavelength

    Wavelength of a sinusoidal wave is defined as the spatial period of the wave, which can be measured between any two points on the wave where the shape repeats. But if my wave is defined as a function of time (like those of a simple harmonic oscillator), how can you say the distance along the...
  29. S

    Confused on when to take derivative

    Here is a question we did in class...Why in the answer do we take the derivatve? How do we know to take the derivative? What in the problem would have set us off to look for the derivative and set to 0? Consider an economy that is composed of identical individuals who live for two periods...
  30. N

    How Does Compounded Interest Affect My CD Investment Over Three Years?

    Eve deposited $8.000 in a 3-year certificate of deposit, which pays 2.2% compounded monthly. Find the account value at the end of the 3rd year and the amount of interest earned during the whole 3-year period. I think i use the payment to a sinking fund formula but i am not sure. possible...
  31. twoski

    What Are the Different Addressing Modes Used in Assembly Language?

    Homework Statement I have a homework question: Calculate the effective address and determine the addressing mode that is specified for each memory operand in the following statements. (a) MOV EAX, [label1] ; label1 is at location 0x00D5A360 (b) MOV EAX, [EBX] ; EBX points to location...
  32. F

    Confused by Chemistry? Get Answers Here!

    Is it just so chemistry is extra confusing to students? I don't understand...
  33. S

    Confused as to what constitutes a manifold?

    I am having trouble getting a set definition of what constitutes a manifold for example , I have the real plane R^2, and the sphere s = {(x,y,z)|(x,y,z)£R^2, x^2+y^2+z^2=1} Note £, is meant to be "element of". And I have a continuous function f mapping the real plane onto s such that...
  34. C

    Confused on how nothing can be faster then light

    I'm confused on how it would be impossible to be faster then light, is it your acceleration? or is it how fast you are going in comparison to some other frame of reference (I do see that phrase being thrown around here)? Because if 2 objects are moving towards each other at more than half the...
  35. J

    Confused about electrodymagnetism

    I`m not a physics expert and have loads of questions about electro magnetism, both classical and quantum. What is a field made of ? in classical it is essentially nothing but how does the force from the charge propagate through empty space. In quantum it says that its a cloud of virtual photons...
  36. Z

    What Is the Galois Group of x^5 - 1 Over Q?

    Homework Statement I'm trying to find the galois group of x^5 - 1 over Q, and then for each subgroup of the galois group identify which subfield is fixed. Homework Equations The Attempt at a Solution If w = exp(2*I*PI/5), then the roots not in Q are w, w^2, w^3, w^4. Its fairly...
  37. H

    Understanding Unpolarized Spin States in Quantum Mechanics

    I am confused about mixed quantum states, if the only observable states are pure eigenstates, since we have to measure to observe, what is the physical meaning of a mixed state?
  38. B

    Confused by surface charge and voltages

    How can a conducting sphere have no voltage at the surface, and yet have a surface charge when there's a charge outside of the sphere? Wouldn't the surface charge create voltage at the surface?
  39. R

    Why Does My Calculated Answer Differ from the Marked One on a Physics Test?

    While I was studying I downloaded and printed a previous old test which already answered I tried to re-solve the questions by myself but there is one question made me confused as I get a result mentioned in the options but the marked answer is different. I am talking about question 3 in the...
  40. Z

    Is it too late to switch to a physics degree at 38 years old?

    Hi, I have just a few basic questions. I was in the army for about 6 years then worked as a CCNA for about 6 years before being layed off, entire company was farmed out to Philippians I believe. I am a disabled vet with a wife and 2 year old. I was accepted into the VA's chapter 31 program...
  41. M

    Confused with mechanical waves

    Hello, I am having issues understanding all the waves, there are a lot of equations involving sine and cosine..and then all the various ways frequencies are looked at. I'm talking about pendulums, oscillators, standing waves, and sound waves. They all look similar in there form, but it is a...
  42. R

    Trigonometric substitution. Pretty confused where constant comes from. (fixed)

    Find ∫from .6 to 0 x^2/ sqrt(9-25x^2) dx My teacher worked this on the board a little confused O obviously the trig sub is asintheta. But it isn't in the right form yet. So get it there you pull out a 25 --) sqrt(25(9/25) - x^2 ) 5sqrt((9/25)-x^2 so x= (3/5) sintheta so dx = 3/5costheta. so...
  43. S

    How Do You Calculate Potential Energy for Different Orientations of a Brick?

    Homework Statement A 1.57 kg brick measures 20.0 cm x 8.00 cm x 5.50 cm. Taking the zero of potential energy when the brick lies on its broadest face. (a) What is the potential energy when the brick is standing on end? Note: You can treat the brick as though all its mass is concentrated at its...
  44. C

    Confused about conditional statements and vectors?

    A conditional statement is of the form A→B. Truth tables suggest that the converse, B→A ≠ A→B. It is also known that any two vectors A and B are perpendicular if and only if their dot products are zero. My confusion is... A dot B = 0 → A and B are perpendicular. The converse is...
  45. L

    Probability Question (Simple, but I am confused)

    Homework Statement 1. The question asks for the value of P(~A and ~B) - What equation to use? The Attempt at a Solution 1. I am confused though, is P(~A and ~B) same as 1 - P(A and B) or should I use, Pnot(A or B), and this is equivalent to 1 - P (A or B) ?Extra question... There is also...
  46. C

    Confused on how to set up my S and S' frames for Lorentz Transformation

    1. The question states: "Two lights are placed along the x-axis at positions x1 = 3.00 m and x2 = 5.00 m. The lights flash at times t1 = 1.00 ns and t2 = 9.00 ns. An observer in a rest frame moving to the right sees the lights flash in the same location. Assume that the origins of the two rest...
  47. E

    Special Relativity Energy Problem a little confused

    Homework Statement At Earth's location, the intensity of sunlight is 1.5kW/m^2. if no energy escaped earth, by how much would Earth's mass increase in 1 day? Homework Equations ΔE=Δmc^2+ΔKE Rearth=6.378x10^3 The Attempt at a Solution I know that the change in kinetic energy does...
  48. A

    Confused on Vector Math: Find Resultant Vector

    Homework Statement Homework Equations x^2 + y^2 = r^2 The Attempt at a Solution I understand everything, but the last segment. What vector B when added to vector A, gives a resultant vector with no x component and a negative y component 3.34 units in length? So 3.34 = Sqr Root [(0^2) +...
  49. S

    Medical What is the action of acetylcholine and anticholinesterase. Confused

    What is the action of acetylcholine and anticholinesterase. Confused! Hello everyone, Ok Acetylchlone is released from postganglionic parasympathetic fibres and preganglionic nerve fibres of both sympathetic and parasympathetic nerves. It also cause muscle contraction in neuromuscular...
  50. S

    Lorentz transformation Problem, Confused on setting it up

    So this is my first course in upper level physics, and I'm still trying to figure out special relativity. The problem: Two events occur at the same place in a certain inertial frame and are separated by a time interval of 4sec. What is the spatial separation between these two events in an...
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