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. P

    How Do You Tackle Partial Differentiation with Trigonometric Functions?

    Homework Statement If x = yz and y = 2sin(y+z), find dx/dy and d^2x/dy^2 Homework Equations The Attempt at a Solution I am beyond confused at how to even start this one, the problem is not like any of the examples in my book. I know x = ydz + zdy but don't know how to deal...
  2. J

    Easy question has me confused (Inclined plane)

    It seems to be an easy question but for some reason I can't figure it out. Homework Statement If the 10 lb block A slides down the plane with a constant velocity when θ = 30°, determine the acceleration of the block when θ = 45°. Homework Equations F = ma The Attempt at a...
  3. F

    Question about RMS power, confused a little

    Hi everyone, I have a question maybe one of you can help me out. I have been working on a solid state tesla coil made with mosfets and a sg3524 PWM chip, I have got it working and am in the process of adding a current limiter to it (Mosfets can get expensive). The current limiter works with a...
  4. I

    Solving Pendulum Motion: Vo, Angle 48', Horizontal & Vertical Positions

    1. There is a pendulum of Length 2.1m. Its bob has speed Vo when the cord makes the angle 48' with the vertical. a) what is the speed of bob in lowest posotioin if Vo=8m/s? What is the least value Vo could have is pendulum is to swing down and then up to: b) a horizontal position c) a...
  5. T

    Confused about Vertical Windmills

    I'm thinking of building a small vertical-axis wind turbine as a project over school vacation. By small I mean maybe three feet across and three or four feet high. I'm trying to come up with the best design. This type of turbine is good at generating torque, not RPM's, so I want to try to...
  6. G

    Very Confused Static Pressure?

    Hi, I am trying to calculate as best but simply as i can the (approx) thrust from a propeller.. and my research shows i have to calculate: prop velocity(pv) = pitch * rpm with pv i can then use Bernoulli's equation to calulate the pressure and multiply it by the propeller surface area...
  7. M

    Confused about water/compressed air

    This is my first post in this forum. First and foremost, big thanks to anyone who takes time out to help me with this. I work for a fire protection company; one thing i service is fire hydrants. I recently discovered this and do not understand why this is happening: A hydrant contains...
  8. B

    Confused on Gravity: Is Gravitational Force Strong Enough for a Black Hole?

    I'm confused! Gravity is the weakest force...right. How is it possible to hypothesize that a black hole scenario of gravitation being stong enough that nothing else can escape?
  9. Z

    A little confused in Zero Input response

    Guys I know how to solve the simple ones but this one has complex roots I have to find the zero input response (D-1)(D2+1)y(t)=(D2+2)f(t) y(0)=4 y'(0)=3 y''(0)=3 D2= D square. Y' = first derivative Y''= secondI know the roots are +1, j and -j But I don't know how to solve or...
  10. E

    Contrails/Vapor on plane wings? confused

    In the case of a could of vapor forming on the top of a planes wing, I understand that this depends on the relative humidity, and that due to the drop in pressure above the wing (bernoulli..lift..etc), there is a drop in temperature. It is said that the drop in temperature brings the water in...
  11. turin

    Confused about the concept of equality

    Ever since I took a "high-level" math class (grad level topology), I have been baffled. This baffling has been further confounded by a couple of math-methods courses in which the professor was a highly gifted and recognized mathematical physicist, and so very careful (and picky) about the...
  12. S

    So confused with 5' to 3' end of DNA molecule

    Hello everyone, Quick questions. What do they mean by different polarities in anti parallel DNA strands. Are they referring to some chemical polarity or simply the fact they run in opposite directions. I'm confused with DNA replication. DNA polymerase can only synthesize DNA in 5' to 3'...
  13. S

    Confused? Let's Clarify Homework Solutions!

    Homework Statement http://img692.imageshack.us/img692/6661/36979008.jpg Homework Equations The Attempt at a Solution whats wrong with it? I am 100% sure and i can explain each one! the first one equals 3 right? second one should be true because 0/0 can be any number.. (thats...
  14. C

    Rotation question. Please Im so confused

    Rotation question. Plz please please help. I am so confused Homework Statement Two masses m1 and m2 are connected by light cables to the perimeters of two cylinders of radii r1 and r2 respectively, as shown in the diagram above. The cylinders are rigidly connected to each other but are...
  15. D

    Confused about probability solution

    Here is the problem. If you roll 5 six-sided dice at the same time, what is the probability that the sum of the roll is 20? This is the solution that someone did. The problem can be viewed as distributing 20 identical objects into 5 containers so that each has between 1 and 6 objects...
  16. Q

    How Do You Calculate Probabilities Correctly in Different Scenarios?

    A box contains 5 white balls, 3 red balls and 2 green balls. The balls are taken from box. With replacement and taking a total of 3 balls, P(all balls have different colour)=(5/10)x(3/10)x(2/10) x 3! =0.18 This answer is the same as at the back of the book. My explanation is that a white, red...
  17. S

    Confused about symmetries and canonical transformations

    this is a problem confusing me, which is in the book named Principles of Quantum Mechanics by R. Shankar. This problem is not about quantum mechanics, but just in the chapter of Review of Classical Mechanics. (The ******** is just to avoid to be deleted). The problem is in the attachment...
  18. fluidistic

    Confused about charged rotating disk-Magnetism, reference frame

    For some reason I've thought about the following case : A uniformly non conductor charged disk is rotating with an angular velocity \vec \omega. If I see it in front of me I'd observe a magnetic field since moving charges produce a current which produce a magnetic field according to Ampere's...
  19. N

    Net ionic equation and Redox equation confused

    Homework Statement Write the net ionic equation for H2SO4(aq) to the KMnO4(aq)Homework Equations The Attempt at a Solution I am confused on which one should i write. The first method is to list all the species, then use the data book to find which one is the strong OA and SRA. Multiply one or...
  20. J

    What to choose for co-domain, somewhat confused

    When you choose the co-domain can it just be anything that is greater than the range (i.e. the image)? In general, should the co-domain just be whatever space it maps to: R^2, R^3, etc. whereas the range is a subset of that space such as R^+ (all positive reals)?
  21. I_am_learning

    What is the Nature of Material Waves in Quantum Mechanics?

    So far I have learned these (correct me If I am wrong) A photon can be considered both an wave and particle. The wave equivalent of the photon is the superposition of Electric and Magnetic Field Waves. Similarly, De Broglie expanded this concept into matter. He proposed that Every matter has...
  22. J

    Hydrostatics- need volume of submerged block- confused

    hydrostatics- bouyancy-need volume of submerged block- confused Homework Statement Need help with #11 attached tank has 2m of water gate is 1 m wide pulley is 1/2 m above water specific weight of concrete is 23.6 kN/m3 need to find volume of water to keep gate closed Homework...
  23. A

    COnfused: what is the derivative of ln(2x)?

    Homework Statement What is the derivative of ln(2x)? I was just thinking about this, and I got 2 answers. I am in Calc 2 right now. Homework Equations Derivative of ln(x) = 1/x The Attempt at a Solution Since d/dx lna = (1/a)*(derivative of a) Thus d/dx ln2x = (1/2x)*(2)...
  24. V

    What is the Proof for J(-m) = [(-1)^m][J(m)]?

    Homework Statement Prove J(-m) = [(-1)^m][J(m)] (Note: by "J(-m)" I mean "subscript (-m)") Homework Equations J(-m) = sum [((-1)^n) * (x/2)^(2n-m)]/[n! \Gamma(n - m + 1)] J(m) should be obvious. The Attempt at a Solution I tried just plugging in the above formulas hoping to get a...
  25. Monocerotis

    Solving Exponential Equations SO CONFUSED ?

    Solving Exponential Equations SO CONFUSED ? Homework Statement I'm trying to solve problems like these a) 2(3y-2) = 18 b) 27(33x+1) = 3 c) 2x+2 - 2x = 48 d) 10z+4 + 10z+3 = 11 Homework Equations Laws of exponential values. The Attempt at a Solution b) 2(3y-2) = 18 6y-2 = 18...
  26. N

    Why Is Linear Algebra So Challenging to Understand?

    I had a quiz last Thursday about matrices, and I thought I knew what I was doing, but when I got there, nothing made sense to me. I'm pretty frustrated because I'm having a lot of trouble grasping any of the concepts I'm learning in linear algebra, while I'm doing fine in my "regular" math...
  27. S

    Confused lost and demoralised >.<

    Hi guys i am currently a year 1 student and i am doing physics major and i am having a tough time now :grumpy: Even though what i am learning now is the basic of physics, sometimes i find myself lost during lecture and can't make any sense of what the lecturer is saying. Is this a common thing...
  28. M

    What role do currents play in the Meissner effect?

    Ok. So I'm really confused. The variation in perspectives by physics authors has really left me worried. With the meissner effect, are the currents induced in the surface of the super-conductor eddy currents? If not what type of currents are they? Could you provide a justification, as no text...
  29. N

    Confused on next step in finding instantaneous velocity

    Homework Statement In a time of t seconds, a particle moves a distance of s meters from its starting point, where s=3t^2+13. Find the average velocity between t=1 and t=1+h if (i) h=0.1 (ii) h=0.01 (iii) h=0.001 Use the obtained answers to estimate the instantaneous velocity of the...
  30. S

    Discovering My True Passion: From Computer Science Student to Aerospace Engineer

    I'm currently an 18 yrs old computer science student who love fancy 3D graphics. I really love computers since childhood years that's the reason why I took this course. But right now I'm an incoming 3rd year student and noticed that I don't like what I'm doing here in school. Though I love what...
  31. B

    Velocity/Acceleration word problem. I'm so confused

    Homework Statement You are traveling at 20 m/s and the stop light turns yellow. You have to make an insantaneous decision: Do i brake before the intersection or do I hit the gas pedal and beat the light? Keep in mind that this particular intersection is photo-enforced, and an $85 traffic...
  32. U

    I'm confused about power and voltage.

    I know power is what causes devices to function in a circuit. What role does the voltage have in a circuit?
  33. J

    How Does Calculus Integrate with Physics Concepts like Electric Fields and Flux?

    Homework Statement Integration I am soooo lost. I don't even know if this is the right forum... But where is the bridge between Calculus and Physics? I can Integrate equations, but when it comes to physics, i for one, don't know when to integrate; two, i don't see how you find the...
  34. S

    Confused by bioelectrical phenomenon

    Hey, first post in this forum! Ive been reading a lot of books related to biology and the more I read the more confusing the subject of electricity in living organisms gets. For example, a lot of books introduce membrane potentials as something that can be measured using two microelectrodes...
  35. A

    Confused with a certain aspect of special relativity

    I am confused with a certain aspect of special relativity. Here is my reasoning... Someone in a rocket, traveling at 0.99c ages slower and thus would be younger after returning to Earth than his twin brother. I understand the 'light clock' explanation of this. Here's where I'm getting...
  36. S

    Conservation of momentum, confused about variables

    Homework Statement In a conservation of momentum lab, two objects were collided together, velocity before and after the collision were measured. The problem asks how the momentum compares before and after I'm really confused about the variables here... In the hypothesis it asks to...
  37. Xezlec

    Pair of moving charges - confused

    Pair of moving charges -- confused Here was a subject I thought I kind of had a grasp on, but apparently my understanding of SR is not very good at all! We have 2 charges, a positive and a negative one. I'm holding one in each hand, and I'm running forward, so their attraction is...
  38. A

    Heat Transfer Problem Confused

    I'm super confused about this problem. I don't even know where to start. It seems very simple, but I just can't figure it out.. An electrical resistor is connected to a battery. After a brief transient, the resistor assumes a nearly uniform, steady-state temperature of 95 degrees C, while the...
  39. P

    Confused about the proof of U = U + U, where U is a subspace

    Homework Statement Hi I need help understanding a proof. This is my first time in a pure math class, so proofs of this type are a little weird to me. If U is a subspace of the vectorspace V, what is U+U? Homework Equations The proof: (v_{1}+v_{2})\in U+U As v_{1},v_{2}\in...
  40. T

    How Does the Poluly Equation Explain Speed and Pressure at a Microscopic Level?

    So many years. I always confused in some principle(i mean sharp pointed)questiones. first one is the biggest one. How to explain the Poluly equation(i mean the relationship between the speed and pressure) in the level of microcosmical. (spoted! i mean the level of microcosmical but not...
  41. W

    Problem from Griffiths confused me

    I'll explain the problem. \cdots \cdots \cdots \cdots \cdots \cdots \ldots=====|====== \cdots \cdots || LOOP | LOOP || --> V \cdots \cdots ||=====|=====|| \cdots \cdots <-x-> ..| \cdots \cdots [Dotted area indicates field] In the usual discussion of motional emf, all...
  42. Q

    [HELP] Confused about EMF induced in rotating coil

    Ok, now I got another question while doing electromagnetic induction questions. I know flux linkage=NBA and in a rotating coil, Flux linkage=NBA cos wt, which differentiated (Faraday's Law) wrt time gives E=NBAw sin wt, where w = angular frequency. However, when the plane of the coil is...
  43. G

    Confused About Van der Waals' & Ionic Solids

    Homework Statement Homework Equations The Attempt at a Solution I think Graphite is a Van der Waals' Solid and, er, salt would be an ionic. But I really don't have much of a clue about what the second part is going on about! Thanks! :)
  44. E

    Solving Current & Power Problems: Confused Beginner

    Problem 1 Just starting on the Current & Power chapter and I'm a little confused. I know they're just basic definitions and concepts, but I'm having trouble wrapping my head around it. Easy questions follow, but I'm lost. Homework Statement How many electrons flow past a point in a...
  45. S

    Newton's Second Law and Tension - very confused

    This is not a homework problem so I am ignoring the template. I was watching Walter Lewin's video lectures and this experiment he performs intrigues me. I have given it a thought for over an hour but have no answer as to which and why will that string break. I have uploaded the experiment...
  46. S

    Confused about Velocity Based Time Dilation

    I've been twisting and turning my brain to figure this out but I need some explanation: Following the twin paradox, I've learned that aging does occur, but I thought that time dilation was relative to the observer and the 'observee'? So if aging does occur then doesn't that mean that there is...
  47. A

    Confused by an example in Brian Greene's book and SR in general

    Hi there. I've been reading Brian Greene's book "An Elegant Universe" for the sake of curiosity and one of his examples to demonstrate special relativity really confuses me about the entire concept. To start, this is my current understanding of SR, so please correct me if I am wrong: -The...
  48. N

    Is it too late for me to pursue a career in engineering and science?

    I am going to be a high school senior, on my way to receiving an IB diploma, as well as having taken AP European History (5), AP Chemistry (5), AP Music Theory (4, but taken as an independent study) and am enrolled in AP Calculus AB (might switch to BC). So far I have taken two IB tests...
  49. P

    Equilibrium constant varying with temperature but confused

    Homework Statement OK. so i have a separation science lab report write up to do which involves the equilibrium of the tri-iodide ion dissociating into iodine and iodide. I know the concentrations at room temperature (which is very cold, about 10 degrees C, where i come from!), and thus the...
  50. R

    Do you wonder why people get confused?

    Read this. Electric flux is a measure of the number of electric field lines passing through an area. To calculate the flux through a particular surface, multiply the surface area by the component of the electric field perpendicular to the surface. If the electric field is parallel to the...
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