What is Cut: Definition and 266 Discussions

In civil engineering, a cut or cutting is where soil or rock from a relative rise along a route is removed. The term is also used in river management to speed a waterway's flow by short-cutting a meander.
Cuts are typically used in road, rail, and canal construction to reduce the length and grade of a route. Cut and fill construction uses the spoils from cuts to fill in defiles to cost-effectively create relatively straight routes at steady grades.
Cuts are used as alternatives to indirect routes, embankments, or viaducts. They also have the advantage of comparatively lower noise pollution than elevated or at-grade solutions.

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  1. N

    Transfer functions and cut off frequency

    Homework Statement RC parallel circuit with the resistor first and the capacitor next. find the transfer function H(jw) resistor first then capacitor transfer function of a circuit with resister serial then capacitor and resister parallel I have absolutely no background in...
  2. L

    MHB Maximizing the weight of a cylinder cut from a sphere

    A sphere weighs P kg what is the weight of the higher straight circular cylinder that can cut from the sphere? Answer sqrt(3)P/3
  3. S

    Dilemma? - Am I cut out to pursue masters in physics

    Dilemma? -- Am I cut out to pursue masters in physics I'm in my life at a juncture where i have eagerness and enthusiasm to pursue masters in physics but due to prior experience I'm a bit reluctant. I enrolled for masters in physics 2 years back but dropped out in the final year due to...
  4. M

    Determining internal force with section cut on structure

    Homework Statement Homework Equations The Attempt at a Solution Hello, my problem seems to be that I have two values that are possible for the Force FG, but I also am not considering the internal forces F_DE and F_FE. I'm not sure how to go about finding those if they are important for...
  5. R

    How does Hay differ from fresh cut grasses

    If you have an animal, such as a Horse or rabbit which feeds on Hay, what (if any) nutritional difference is there between "Hay" and "fresh grass". Obviously, Hay is grass that has been sun dried to make it more storable. Are there chemical or protein changes that occur to grass that has been...
  6. Tesladude

    How can I cut out 60hz reception from transformer?

    I just made an amp for a friend giving about 30 watts x2. but it is in a small project box and I am receiving 60hz coming into the input of the amps. I have done tests and it is the EM field of the transformer, I have 2 trimpots on the inputs to the amplifier and have been able to cut out this...
  7. M

    Finding g(-i) using branch cuts in ln(1-z^2)

    Homework Statement Given that g(z) = ln(1-z^2), defined on \mathbb{C}\backslash \left(-\infty, 1\right], i.e. the branch cut is from -\infty to 1 along the real axis. Find g(-i) given g(i) = ln(2). Homework Equations The Attempt at a Solution I tried drawing it out but I'm having...
  8. E

    Geometric expressions for a quarter circle cut at an arbitrary point

    Homework Statement I am after finding general geometric expressions for a quarter-circle that is split into two segments along either its domain or range (they are equal). I.e. Taking the circle shown in Figure 1 and concentrating on the upper right quadrant, I am after expressions for the...
  9. E

    What happends when you cut something in half?

    What happends to atoms when you cut something in half, say a sheet of paper. In a solid, atoms are packed tightly, so I was curious and wondering of this is even a valid question.
  10. I

    Am I cut out for this? Entering 2nd year undergrad.

    I'm attending a college in the top 10 in math/physics. I did really well in HS, scored in the 99th percentile, etc. That whole time I guess I'd be considered depressed. I was lazy and slept through all my classes. Never turned in work. I was unmotivated. This started in late elementary school...
  11. CrimsonFlash

    Branch Cut for (lnz)^2: Determining Branch Points and Range

    Homework Statement It is simply the same as the one for lnz i.e. does it go from 0 to ∞? Also, is there any proper way to figure out branch points of a function? Homework Equations The Attempt at a Solution
  12. L

    Image of a Convex Lens Cut in Half Horizontally

    Hello everyone, A friend of mine came up with this question in class and I really do not have a good answer. Suppose you have a convex lens that has been cut in half horizontally and the top half removed. The question is: Will the bottom half of the lens still form an image? I really...
  13. A

    What is w cut particle physics?

    As is shown in the website http://www-sldnt.slac.stanford.edu/snowmass/Software/EvtGen/documentation/pylist.txt is the pythia particle/parton data code, could someone tell me the meaning of parameters "col" "anti" and "w-cut". Any comments are very welcome.
  14. P

    Volume of two pieces of a sphere cut by a plane

    Homework Statement Consider the unit sphere x^{2} + y^{2} + z^{2} = 1 Find the volume of the two pieces of the sphere when the sphere is cut by a plane at z=a.The Attempt at a Solution My interpretation is that a is a point on the z-axis that the plane cuts at. So the height of the segment...
  15. skate_nerd

    MHB Implicit surface area, sphere cut by two plane

    Got a little problem here, just want to make sure what I'm doing is right because it's a little different from anything I've done that is using the same formula initially. So there's a sphere denoted as \(\Omega\): $$x^2+y^2+z^2=R^2$$ and its cut by two planes \(z=a\) & \(z=b\) where...
  16. C

    Resistance Wire Cut and Splice - Too Much Current Now

    Hey Guys - Long time reader, first time poster. I am attempting to develop a prototype of a new product. Part of this product will involve a good length of resitive wire that will generate heat. To accomplish this I cannibalized an electric blanket for the resistive wire and power controller...
  17. L

    Could a lightsaber cut through adamantium?

    The title says it all...Do you think a lightsaber could cut through adamantium? Why or why not?
  18. B

    MHB Trig problem: max square cut from circle

    [SOLVED]Trig problem: max square cut from circle Since this one is homework related, ill ask this as a procession so that I can make sure that I am grasping the logic. the question is that with a round log with a diameter of 16cm, what is the strongest log that can be cut where the strength =...
  19. S

    Center of Mass with Circle that has a Cut Out

    Homework Statement Find the center of mass of a 5kg circle with a radius of 4m with a circle that has a radius of 2m cut out from it. Homework Equations The Attempt at a Solution To be completely honest, I do not know where to start. I do know how to find the center of mass when...
  20. C

    How to cut power when given max voltage reached?

    Hi all I need to disconnect the power once a given voltage drop at some component (a capacitor in this case) is reached. For example at first the voltage between the leads is 0 and starts climbing up once there is power. When the voltage reaches 2.0 V, I want the power to be cut off...
  21. N

    Mellin's inversion integral, branch cut problem

    I recently had to solve a problem in which i had to find the inverse laplace transform of some function with a branch cut from - ∞ to 0, so i used a contour avoiding that branch cut like this http://www.solitaryroad.com/c916/ole19.gif my problem is as follows: i know the contributions from...
  22. J

    Complex inversion formula (branch cut issue)

    Hi, first time trying to to use the complex inversion formula and I'm confusing myself. I'm trying to find L^-1{ ln(1 + (1/s))} I can see that there is an essential pole at s=0 (is this even right? The power series has an infinite amount of z^n's in the denominator..) and branch points at...
  23. J

    Proving Existence and Uniqueness of Cut C for A+C=B

    Homework Statement Show that for any two Dedekind cuts A,B, there exists a unique cut C such that A+C=B 2. The attempt at a solution In order to prove this, I need to prove the existence and uniqueness of such a cut. For the existence, I started by considering a cut for which this works...
  24. G

    How massive does a planet have to be to cut time in half?

    With respect to time in empty space, how massive does a planet have to be to affect the time to the point where the planet's time runs half the speed of empty space time?
  25. I

    Improper Integral With Branch Cut

    I understand most of the problem, but have yet to understand where a particular term came from. The problem is as follows: Homework Statement Show that (0 to ∞)∫dx/[(x2+1)√x] = π/√2 Hint: f(z)=z−1/2/(z2+ 1) = e(−1/2) log z /(z2+ 1). The Attempt at a Solution I actually have a solutions...
  26. G

    Why do blackholes cut off from the rest of the universe

    This is from Hawking's Brief History of Time: I don't see why the black hole is cut off from the rest of the universe. The black hole is still there and it's still made of ordinary matter, just a more dense than other matter. Is it because time stops in a black hole? Or that nothing can...
  27. E

    Geometric expressions for a spandrel cut at an arbitrary point

    Homework Statement I am after finding general geometric expressions for a quarter-circular spandrel that is split into two segments along either its domain or range (they are equal). I.e. Taking the geometry provided in the sketch below (Figure 1) I am after expressions for area and centroids...
  28. G

    Medical Why Doesn't Diatomaceous Earth Cut Humans?

    Diatomaceous Earth is a very fine white powder, used for insect control among other things. According to my research on the webernets, it works by "cutting up" the exoskeletons of insects, and drying them out resulting in death. Because this substance works through mechanical means rather than...
  29. S

    Laser cutting device to cut paper of few mm from a red laser pointer

    Hi, i wanted to make a laser cutting device, not the big one but a small device just to cut a few mm thick paper. I just learned from a site(www.ehow.com/m/how_6692865_make-homemade-cutting-laser.html) that you can actually convert a laser pointer to a laser cutting device by rotating the...
  30. H

    Find the continuous branch cut of a complex logarythm

    Homework Statement Find the continuous branch cut of a complex logarythm for C\[iy:y=>0] One of the complex numbers, for example, is -4i Homework Equations I don´t understand what to do with the subset. How could I find the continuous branch cut in the subset? The Attempt at a...
  31. 0

    How to restart my computer after power cut?

    Hi, my computer is running 24h with a software which controls an electric equipement. This software is working as a PLC, so when i start this software i have to specify the date, time and the number of cycle which it must start. Problem: during a power cut, my computer is running in UPS...
  32. J

    Proving that this set is a Dedekind cut.

    Homework Statement Homework Equations In the above proplem, A is a dedekind cut. To be a cut: 1. A \not= \mathbf{Q} and A \not = \emptyset 2. If r \in A, then all s \in A for all s \in \mathbf{Q} such that s < r 3. A has no maximum I know the 3 properties by heart, but the...
  33. K

    Volume of sphere cut by two parrallel planes

    Homework Statement A sphere of radius R with centre at the origin is cut by two parallel planes at z=\pm a, where a<R. Write, in cylindrical coordinates, a triple integral which gives the volume of that part of the sphere between the two planes. Evaluate the volume by first performing the r,θ...
  34. P

    Does Cut Hair Contain Nuclear DNA?

    Is it true that hair that is cut from your head (not pulled), does not contain any nuclear dna ? My understanding of hair structure is that it is a matrix with at least some dead cells present in various layers. Eg the outside cuticle is made of flattened cells . Feughelman, Max Mechanical...
  35. P

    The Mass cut - The relation between 44Ti and 56Ni in supenovae remnants

    Would it be possible if you would help me with a quick question, (as none of the staff here, or postgraduates can answer this question)? My group are designing a gamma ray telescope to look at nucleosynthesis in Supernovae. We have found a thing called the 'mass cut' (the separation between...
  36. C

    Energy Cut off(s) in Gaussian 09 PBC calculations

    Hello Everyone, I am a PhD student working in the field of mineral and material processing. One part of my project involves use of DFT calculations to study adsorption of small to mid sized molecules on mineral crystals. I am using Gaussian 09 simulation package and currently I am in the...
  37. Government$

    Is a Career in Statistics, Actuarial, and Financial Mathematics Right for Me?

    Actually i am planning to study Statistics, Actuarial and Financial Mathematics rather then pure math or applied math. I am 18 years old and currently in 3rd grade of high school currently planning to study math but i have some doubts should i study it. Two and half years ago i ran into some...
  38. B

    Branch cut of the principle value log

    Homework Statement Find the branch points of g(z) = log(z(z+1)/(z-1)) and defining a branch of g as the principle branch of the logarithm find the location of the branch cuts. Homework Equations The Attempt at a Solution Since g(z) = log(z) + log(z+1) - log(z-1) the branch points are 0, 1...
  39. A

    Electric Field of a Spherical Shell Cut in Half

    Homework Statement A metallic spherical shell of radius a is cut in half at its equator. The two halves are separated very slightly and are maintained at potentials +V_{0} and -V_{0}. I am trying to find the electric field at the center of the sphere. Homework Equations The equation for...
  40. B

    Explain why long wave radio does not cut out in tunnel.

    Homework Statement Explain why if your car is tuned to FM, it cuts out when you enter a tunnel but doesn’t if you are tuned to long wave reception. (λ of FM: 3m, λ of long wave: 1500m) Homework Equations The Attempt at a Solution Well, what I think is that.. As the λ of the long...
  41. W

    Can Anyone Succeed in Engineering with Hard Work and Practice?

    Hello, I wanted to know what people's opinions are on if you need to have a brain that was meant for engineering to get through the classes. To clarify, I am good at math (getting an A right now in 2nd semester calculus), but I am not very good at physics. I don't plan on being an actual...
  42. S

    When using the method of sections to find a force in a truss, how to orient the cut?

    Homework Statement So, there is method of joints and method of sections to find the force of specific members of the trusses. They only give examples where the section was cut vertically or diagonally. Can it also be cut in a semi-circle? I tried it out and it didn't give the right answer...
  43. V

    Short cut tricks to find resistance of large/messed resistance's network.

    Today our physics teacher teach us how to find resistance of a network of resistance that is messed to heavily(example all sides of a cube are resistance find resistance). Ok those are very good methods, but it seems that they are not result of experiments done by genius persons it seems that...
  44. E

    Old vs new unitarity cut methods

    Hey folks, I've been stumbeling recently about new unitarity methods to obtain one-loop amplitudes by cutting them in all possible channels thereby reducing the full amplitude to products of tree amplitudes (pioneered by Bern, Dixon, Kosower, Dunbar). From what I understand from my QFT...
  45. Femme_physics

    I've cut the isolated band of my earphones

    So I've cut the isolated band of my earphones to see what's inside (my cheap earphones quit working). I expected to see copper. And I have. But, there is also a red wire and a blue wire amongst the copper. At they dyed copper, or a different metal...
  46. L

    Arc welding plant power cut off

    I have an arc welding plant and I realized that I am wasting energy when it is not used but powered on. Can anyone please suggest a way to get rid of this problem? That is, plant gets "active" when it is welding and is "idling" when it is not welding.
  47. K

    Can we represent pi as a dedeking cut in the rationals

    Hi , I only recently read the construction of reals from rationals. I could grasp that \sqrt{2} can be represented as the set of rationals given by {x\in Q : x2 < 2 } . As we know this set is defined purely in terms of Q. Is there a dedekind cut representation for pi as well ? I read...
  48. 5

    Wire cut to shape circle and square so total area is maximum or minimum

    Homework Statement A piece of wire 40 cm long is cut into two pieces. One piece is bent into the shape of a square and the other is bent into the shape of a circle. How should the wire be cut so that the total area enclosed is a (a) maximum and (b) minimum? Homework Equations Area...
  49. E

    MATLAB Cut and paste Matlab coding into Latex for equations

    Hi guys, I have to do a lot of equations in a report, and I was wondering if there is a package for Latex so that I can just cut and paste matlab/excel coding straight into Latex and it will set it out properly. i.e. so that instead of typing \frac{5+x}{4} I can just write (5+x)/4?
  50. K

    Galois Theory Intro Cut Short - Seeking Resources

    I was taking a lecture series this summer at my school where a professor was introducing us to introductory Galois theory. It was a very 'slack' introduction, without too much rigour. However, about a month in (only 3-4, 3 hr lectures) they stopped due to outstanding circumstances. I was a...
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