What is Difficulty: Definition and 268 Discussions

Degree of difficulty (DD, sometimes called tariff or grade) is a concept used in several sports and other competitions to indicate the technical difficulty of a skill, performance, or course, often as a factor in scoring. Sports which incorporate a degree of difficulty in scoring include bouldering, cross-country skiing, diving, equestrianism, figure skating, freestyle skiing, gymnastics, rhythmic gymnastics, surfing, synchronized swimming and trampoline. Degree of difficulty is typically intended to be an objective measure, in sports whose scoring may also rely on subjective judgments of performance.

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  1. S

    I want to know about electricity.i am facing a huge difficulty in it.

    helo i am facing difficulty in understanding a question, help is required. does the resistor affect the current flowing in a circuit if yes why and if no why. I think it affects the current flowing through it as the resistor affects voltage. please help
  2. W

    Exploring the Difficulty of Chemistry Majors - Is Chemistry Right for Me?

    I was contemplating majoring in chemistry when I go back to university. I don't want to do this physics (not that i don't like physics nor is it that i can't - just not interested in taking the classes). Thus, I would do a Bachelors of Arts instead of science to avoid the physics. I was...
  3. O

    Time independant perturbation - Difficulty understanding derivation

    Hamiltonian is in the form ##H = H_0 + \lambda W##, where ##\lambda \ll 1## and ##W## is the perturbation. Assume the eigenstates ##\mid \psi(\lambda) \rangle## and engenenergies ##E(\lambda)## can be expanded in a power series of ##\lambda##. $$\mid \phi(\lambda) \rangle = \mid 0 \rangle +...
  4. P

    The difficulty of understanding voltage

    Hi all, first post, I hope this is the right place. As I understand, voltage is a measure of the energy given to each coloumb of charge. Therefore, a cell with a higher emf will give more joules of energy to each coloumb of charge. However, voltage is also the driving force behind getting...
  5. S

    Understanding Shear Stress in Tensile Loaded Bodies: Causes and Effects

    Hi all, I'm having problems with visualising shearforce for a body.Let us take a rectangular prism and fix one of its ends.Let the other end be subjected to a tensile force T Newtons.The normal stress acting on the cross section is the tensile force /area of cross section perpendicular to...
  6. Z

    Difficulty understanding a logical equivalence

    \exists{x}(P(x)\Rightarrow{Q(x)})\equiv{\forall{x}P(x)\Rightarrow{\exists{x}Q(x)}} I am able to derive this equivalence by using the standard equivalences of symbolic logic, but when I try to verify this semantically, with an example, I just can't see why these two expressions are equivalent...
  7. A

    Conceptual difficulty with Electromagnetic induction

    Hi all, I have a conceptual difficulty with the idea of induction of a current in a wire due to a changing magnetic field. Initially I was very comfortable with the idea. Upon seeing the typical setup of a square wire being rotated in a region of uniform magnetic field, I was happy to accept...
  8. P

    Static Equilibrium with buoyant force. High difficulty.

    Homework Statement I attached the original problem and a diagram I made with the variables on it. Basically we have a rod hanging from a wire at an angle theta with tension and the other end floating in water. So there is T=tension, weight=w=mg and buoyant force=F_b. I introduced symbols for...
  9. J

    Physics vs. Chemical engineering, difficulty

    I've heard that engineering (generally) is less difficult than physics but I've also heard that ChemE is the most difficult engineering degree to get. So which is more difficult to get: a B.S. in Physics of a B.S. in ChemE? If ChemE is eaiser, exactly how much easier is it: considerably or only...
  10. X

    Difficulty with the pullback bundle

    i attempted the first 100 pages of Walter Poor's Differential Geometric Structures, taking me about two months, and the most difficulty i had was trying to understand the utility(?) of the pullback bundle. its possible that its just a very difficult subject and the only thing that's needed is...
  11. T

    Difficulty with permutation and combination

    Right I am having an issue with the proof to permutation, I really can see the n-r-1 I think the confusion stems because it is in the general term, which throws me a bit, if possible could someone maybe write it in numbers and the underneath write in the general term if not too much trouble. The...
  12. A

    Difficulty understanding Newtonian mechanics with stationary force

    I apologize if this seems much too "freshman", and may come across as annoyingly simple to some more trained or educated on this board. However I will ask the question anyways as I have failed to find an answer elsewhere. Under Newton's Second Law of Motion, f=ma. thus F = kg (m/s^2)...
  13. A

    Difficulty in analyzing automotive tire in workbench

    Hi, I am trying to analyze the effects of pressure on the automotive t=ire by modeling and simulating the same in ANSYS workbench. However, I am having trouble applying material conditions to the model. I wish to use mooney rivlin material but when I apply that based on the guidance given by...
  14. S

    Difficulty with accumulations points

    Homework Statement Hi guys, I'm having real difficulty with understanding accumulation points. I don' really know why that is since others seem to understand the concept fine but I'm very lost. For example, I'm practicing some questions and one of the is : If S is the set of rational...
  15. djh101

    Courses How would you rank these math courses in terms of difficulty?

    I'm trying to keep a balance in difficulty next quarter and would appreciate some feedback as to the difficulty of these classes. The four I'm choosing between are Linear Algebra (upper division), Linear and Nonlinear Systems of Differential Equations, Ordinary Differential Equations, and...
  16. F

    Choosing a school for upper div. physics - difficulty?

    Hello all, I am preparing to transfer to a University of California campus as a junior from a community college. I am applying to several campuses next month and I'd like some guidance in choosing a school for when the time comes to select one. One of the major things I am thinking about...
  17. DeusAbscondus

    MHB Factoring Difficulties: Derivative of $(3x+1)^2(2x-3)^3$

    I'm trying to find the derivative of: $$f(x)=(3x+1)^2(2x-3)^3 \text{ by using the product method}$$ Here is my working out so far, using product rule:$u'v+uv'$ $$\frac{d}{dx} (3x+1)^2(2x-3)^3= 2(3x+1)\cdot 3 *(2x-3)^3+(3x+1)^2\cdot3(2x-3)^2\cdot2$$ Simplified...
  18. R

    Engineering Difficulty finding work with a BS in engineering.

    First post, but I've lurked this site for a few years. I was wondering if anyone has found themselves in a similar situation or had any advice. I currently have a B.S. in Nuclear engineering, graduated about 10 months ago, and have had zero success in finding related work. During school I...
  19. D

    Is Freshman Physics Too Difficult for Non-Calculus Students?

    Hi everyone. I am currently attending the University of Washington, and after talking to a few advisers it has become apparent to me that Physics 121 (first course in the calculus based physics series) is not recommended to people that haven't taken the entire calculus series yet. They explained...
  20. E

    Difficulty in differential form of gauss law

    hi all, im new at electromagnetics and vector calculus, so facing these trivial problems. The differential form of gauss's law for empty space states ∇E = ρ/ε .The right side refers to charge density at the point of calculation of divergence? If a point charge(or a small uniformly charged...
  21. N

    Difficulty level of pre-IPhO exams in india.

    my basics and concepts in physics are relatively the best among my classmates but i have not done expected amount of problems that require IPhO. i am from India and first level NSEP is on 25 november 2012 so i have about 100 days for problem practice. I have collected the following books -...
  22. T

    Raising an Object with Force mg: Intuition and Physics

    If the force applied on ab object due to gravity is -mg why is applying a force of mg give upward raise the object if the two forces are equal and opposite in direction. I would think the object would remain still until you apply a force greater than mg.
  23. O

    Difficulty understanding invariant 'c' implications

    In our world where 'c' is large, most people intuitively understand Galilean addition of velocities at everyday speeds i.e. if someone stands 40m behind me and rolls a ball towards me at 10m/s (assuming we are not moving relative to each other) it takes 4s to reach me. If we repeat the...
  24. D

    Difficulty to find this integral

    Hello! I'm doing some calculus exercises and I'm having some difficulty to find the right answer. Homework Statement The integral is \int \frac{1}{\sqrt{5x+8}}dx and the exercise tell me to solve this by using (a) u=5x+8 and (b) u=\sqrt{5x+8} Homework Equations The Attempt at a Solution This...
  25. D

    Linear Expansion: Accurately Measuring with Tape Measures/Rulers

    Ok So I was told to think about what would happen if you tried measure something with a metal ruler or tape measure in an environment that would cause negative linear expansion; so the ruler gets smaller. How would the accuracy be affected if the tape measure/ ruler was calibrated at a greater...
  26. R

    Difficulty of abstract algebra in relation to calculus

    How difficult is abstract algebra or group theory, plus complex analysis in relation to calculus?
  27. Z

    Engineering Engineering major having physics difficulty

    As the title implies, I am a current engineering major currently having difficulty in the physics material that I need to study for my major. I am in a position where I am considering a possible major change because I am currently questioning if I will be able to make it through the physics that...
  28. D

    Difficulty to find this integral

    Homework Statement Hi! I'm not being able to solve this integral: \int \sqrt{2ax}\; dx We have started with integral yesterday and I don't know much yet. Homework Equations The Attempt at a Solution This is what I tried to solve the integral \int \sqrt{2ax}\; dx = \int...
  29. M

    Is Number Theory Too Much to Handle with Other Physics Courses?

    I was planning on just taking physics courses next quarter (3, maybe 4 total) but I have an interest in taking a number theory course. Would it be too much to pile on with QM, Relativity, a physics-based math course, and part II of E&M? I know this question is impossible to answer because each...
  30. jfizzix

    Chemical potential vs pressure and temperature; difficulty with Fermi gases

    For any system where the thermodynamic limit exists, we know that the internal energy U, the entropy σ, the total particle number N and the total volume V are all extensive. Because of this, we know that the Euler relation holds true U = -PV + \tauσ + \muN and that the chemical potential...
  31. D

    Difficulty to find this limit of trigonometric function

    Homework Statement Hello! I'm having some trouble to find this limit \lim_{x\rightarrow \pi}\frac{senx}{x-\pi } Also, limits like this one \lim_{x\rightarrow \frac{\pi}2{}}\frac{1-senx}{2x-\pi } confuse me a lot!Homework Equations The Attempt at a Solution I don't even know where to start! I...
  32. D

    Why Does This Limit Calculation Fail?

    Homework Statement Hello! I'm having difficulty to find this limit: \lim_{x\rightarrow -1}(\sqrt[3]{\frac{x^3+1}{x+1}})Homework Equations The Attempt at a Solution This is what I'm trying to do to solve this limit: Let \frac{x^3+1}{x+1}=u then \lim_{x\rightarrow -1}(\sqrt[3]{u}) =...
  33. D

    Struggling to Solve a Limit: \lim_{x\rightarrow -1}(\sqrt[3]{\frac{x^3+1}{x+1}})

    Hello! I'm having difficulty to find this limit: \lim_{x\rightarrow -1}(\sqrt[3]{\frac{x^3+1}{x+1}}) This is what I'm trying to do to solve this limit: Let \frac{x^3+1}{x+1}=u then \lim_{x\rightarrow -1}(\sqrt[3]{u}) = \lim_{x\rightarrow -1}(\sqrt[3]{-1}) I know something is wrong I'm just not...
  34. G

    Learning Tensor Basics: Overcoming Difficulties

    I am learning about tensors. Can somebody give me some help. Thanks.
  35. H

    Difficulty in finding upper limit of x

    I've come across the following question: ∫∫∫6xy dxdydz where R lies under the planez=x+y+1 and above the region in the xy-plane bounded by y=0,y=√x and x=1. Now the limits would be: √x→y→0 ; x+(√x)+1→z→2 and ?→x→1 Now I can't get the upper limit of x as a...
  36. Thinkor

    Schwartzschild metric difficulty

    I am trying to understand how the Schwartzschild metric works and coming to the conclusion that if I drop an object that it will not fall to the Earth but just stay there when I open my hand. Therefore, I'm confident I have made a mistake, but I don't see where it is. Here is the metric...
  37. Y

    Difficulty with relativistic units, eV/c^2

    I'm having some difficulty in working with units of mass at the quantum level. This difficulty most clearly manifests itself when I'm doing a Compton scattering problem. Recall that Compton scattering is given by \Delta \lambda =\frac{h}{m_{e}c}(1-cos(\theta )) and that the rest mass of an...
  38. S

    Extreme difficulty with a concavity problem

    Homework Statement 1. Determine the largest open interval where the function f(x)=2x-5/x+3 is increasing AND concave up (at the same time) Homework Equations The Attempt at a Solution I've run through the problem and arrived at a second derivative of f''(x)= -22/(x+3)^3...
  39. C

    Programs PHD comprehensive exams difficulty by major?

    I was browsing through a few schools websites, and apparently, UCR, UCLA and UCSD do not force Chemistry PHD candidates to take a written comprehensive exam! However, the Physics PHD candidates take a brutal and long comprehensive exam consisting of 2-3 quarters each of advanced quantum...
  40. P

    [Help] Genus: Having difficulty to fully understand it.

    Hi I'm having trouble to fully understand the concept of Genus: https://en.wikipedia.org/wiki/Genus_(mathematics) Those examples are preety simple to me Genus = number of handles/holes. But what the wikipedia doesn't cover (at least visually) is when these handles or holes share space like...
  41. B

    My hunch on the difficulty of higher math

    Just about all of the problems in my calculus textbook range on average range between 4 and 8 steps. Once you know the algorithm the problems are usually easy and routine. It is simply a matter of understanding what the algorithm requires. Ironically the hardest part about math is...
  42. Dembadon

    Testing Why do professors curve exams?

    I'm taking a combinatorics course this semester (from the math department), and my professor said the exams are usually devised so that the average score is a 60%, and then they're curved. I've seen this method of exam development with other professors, so I wanted to get some input to help...
  43. A

    A Conceptual Difficulty regarding Potentials

    Plz help me out with this difficulty. Here is a figure showing two conducting spheres(haven't drawn all EF lines):- Here is the problem, Suppose one of the spheres is charged with a charge +Q, other is neutral , so charges will get induced as shown in figure. The left portion of orange...
  44. A

    Courses Which College Course Will Be the Most Challenging Next Semester?

    Hey PF. I've got a month of break before classes start again, so naturally I'm going to spend it nose-down in books like a good little nerd. Trouble is, I don't want to use a shotgun approach to self-study; I'd rather use a focused approach on what I think might present the greatest difficulty...
  45. K

    Having difficulty comprehending a problem in Peskin's text

    In his "an introduction to quantum field theory", problem 5.4 (c), he describes a bound state of positronium as |B(k)\rangle=\sqrt{2M}\int{\frac{d^{3}p}{(2\pi)^{3}}\psi_{i}(p)a^{\dagger}_{p+\frac{k}{2}}\Sigma^{i}b^{\dagger}_{-p+\frac{k}{2}}|0\rangle} where \psi_{i}(p) are the p-orbtal...
  46. W

    Difficulty finding integral answer to set function

    Note: as i was typing this post, i think i figured out the answer but i want to confirm. Question: let A denote the set of points that are interior to, or on the boundary of, a square with opposite verties at the points (0,0) and (1,1). let Q(A) = ∫∫dydx if C, a subset of A, is the set...
  47. S

    Difficulty - Signals and Systems

    Hi In my notes I came across the following sentences:- Any signal consisting of the system's characteristic mode is sustained by the system on its own. The system offers no obstacle to this signal. Not getting what it means. Please, a little help needed. :-) Thanks salil
  48. S

    Courses Difficulty of lower division courses vs. upper division (undergraduate)

    Within the next year, I'm transferring from the local community college to the state university to complete my BS in chemical engineering. Right now I have about 3.5 gpa in my lower division courses (math, chem, physics, intro engineering, etc). Obviously, I'm going to work as hard as I can to...
  49. P

    Is Feynman's QFT Unitarity Issue Resolved?

    From Richard Feynman's Nobel Prize Speech. It must be clearly understood that in all this work, I was representing the conventional electrodynamics with retarded interaction, and not my half-advanced and half-retarded theory corresponding to (1). I merely use (1) to guess at forms. And, one...
  50. S

    Can Practice Help Improve Algebraic Difficulty?

    Hi, I suffer from immense algebraic difficulty. I always understand the material in math 90-100%, but I always flunk on tests (last I got 12%...) because I'm so clumsy with numbers. Are there any practices that focus specifically on that?
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