Hard Definition and 1000 Threads

I know its not impossible, since us humans are cable of self healing to diseases and viruses why not operating systems? I know if there's a good AI program embedded in windows maybe can be used to search for abnormalities in its everyday operation and when found it will develop or create a file...

The school psychologist was researching the results of a third school and found them to closely fit a normal distribution with a mean completion time of 20.68 minutes and a standard deviation of 5.3 minutes. Unfortuantly, after he had finished calculating the results, he could not read of of the...

Homework Statement Is the statement true or sometimes false. Justify your answer: The determinant of a matrix is unchanged if the columns are written in reverse order. Homework Equations The Attempt at a Solution I understand that the only thing that is changed is the sign...

Homework Statement The diagram below illustrates the ballistic flight of circus daredevil, The Great Zacchini, over three ferris wheels, each 21.2 m high. Zacchini is launched at a speed of 27.6 m/s from the muzzle of the human cannon at an angle of 56.7 ° to the horizontal from a height of...

Hi, I need to calculate \Gamma(7/3)/\Gamma(1/3) is there some trick to doing this type of problem? I'm finding it really hard to do from first principles. Any help would be great, thanks!

Homework Statement A shell is fired with a muzzle velocity of 350ms/s at a target 1000m away. Calculate two angles at which the shell can be fired . Homework Equations I think these equations might help... v=u+at s=ut+1/2at^2 v^2=u^2 + 2as Hope these eqations are right. The...

Is there a function f , differentiable for all real x, such that | f (x) |< 2 and f (x)f ′ (x) ≥ sin(x)? I noticed that [f(x)*f(x)]' = 2f(x)*f'(x) = [f(x)]^2 So I tried multiplying that inequality by 2. 2f (x)f ′ (x) ≥ 2sin(x) Then I tried integrating both sides. [f(x)]^2 ≥...

Homework Statement A hydrogen atom is placed in a uniform electric field E(t) given by E(t) = Enaught*exp(-a*t) (where a is a constant) for t >0. The atom is initially in the ground state. What is the probability that, as t→∞ , the atom makes a transition to the 2p state? I know...

Homework Statement Prove that \int\sqrt{}9-x^2 dx =\frac{9\Theta}{2}+\frac{9sin2\Theta}{4}+c given that x=3sin\Theta Homework Equations The Attempt at a Solution \int\sqrt{}9-x^2 dx =\frac{(9-x^2)^{1.5}}{10x} =\frac{(-x^2)(\sqrt{-x^2+9}+9\sqrt{(-x^2)+9}}{10x}...

Hard intergral! :cry:If y = ke-x(sin2x), prove that \frac{d^2y}{dx^2} + 2\frac{dy}{dx} + 5y = 0:cry: Need help asap, No clue how to figure it out. teacher is away until next term, test next week.

I've seen this exact question in a book. (This is not homework) I've always thought this is because work has nothing to do with effort, but seeing this question on a book quite shocked me actually, is there any deeper explanation?

I have 4 p.c.s with SeaGate Barracuda ST3250310AS 250 GB Hard Disks installed in them . These pc.s have 2.7GHz AMD Athalon 64 X2 CPUs & Asus M2N68-AM SE2 Mobos . There is 2 GB DDR2 RAM installed in each of these machines (not dual-channeled) . They also have XFX GeForce 8400GS Cards . However...

I've got two calculus proofs that I can't seem to get! I was wondering if you guys could help me out a bit... 1. Homework Statement Suppose x_{n} is the sequence defined recursively by x_{1}=0 and x_{n+1}=\sqrt{5 + 2x_{n}} for n=0, 1, 2, 3, ... Prove that x_{n} converges and find...

1. Homework Statement [/b] \int e^{3x}\sqrt{1+e^{2x}dx Homework Equations Substitution Parts of Integration The Attempt at a Solution Started off using U substitution setting ex = to u. Then tried to use parts of integration. Now I am stuck.

Say compared to UCLA or Harvard, or compared to Cal State Northridge? And... Is California Polytechnic University, San Luis Obispo a UC or a CSU?

Hello, I am thinking of applying for the above course and just trying to gauge how difficult it is really. I have a 2:1 in physics from Cambridge, and although at times I felt like I was knocking my head against a brick wall overall I think I might have pulled to a first if the exams had...

I'm trying to understand why tennis balls have a higher bounce on clay courts than on hard courts. I understand that the amount of friction is greater on clay so as to slow the ball's vertical speed down and create a steeper angle of reflection. But I don't see how that explains why the...

My course is supposed to go from basic vector algebra to extrema, curl and divergence, (stopping before multiple integration) I don't need any help on this assignment I am just wondering how hard it looks compared to everything else. http://tinypic.com/r/2ly29u8/6

Homework Statement There's a cylindrical conductor of radius d, whose linear charge density is \lambda which is situated at a distance D from a infinite conductor plane. 1)Calculate the potential in the region that starts from the plane and ends at infinity (hence the cylindrical conductor...

Homework Statement (Take g = 10 m/s2 in this question.) The ends of a light inextensible string, of length 0.7 m, are attached to two fixed points A and B at the same horizontal level, where AQ = 0.4 m and QB = 0.1 m. A particle of mass 0.2 kg is attached to the string at the point P, where...

Hi How do you solve this equations analyticaly without solving a 4th degree polynomial sqrt(x)+y=11; x+sqrt(y)=7 Thanks

Do you have hard water? Do you use a filtration system? I get a lot of build up on the faucet and on glass dishes that sit out for a while with water in them (like the cat's 2nd water dish that I don't change every day). Can hard water cause kidney stones or other health problems?

[b]1. E=hf "find the energy level of light with a frequency of 4.3 x 10 so the 14th jules [b]2. E=hf [b]3. Have no clue, tried multiplying Plancks constant by frequency but idk if its right

I need some general information about hard coatings and their basic oxides, but I cannot find any good links... Is it possible that you could know a link or two?

I'm new here and this is my first post, so I'ld like to give you all a hearty hello right at the beginning! Long story short, I'm in high-school and I'm wondering whether I should go nuts and take part of every single competition and olympiade etc to impress the universities I wish to apply for...

Hi all, have been wondering, why is it that when you put your hand in water, it's soft and there is hardly any resistance, but when you jump into it like from 100m above, you will most probably kill yourself? Is it because there is not enough time for the forces to distribute across the water...

Hi! I´m a senior high school student and I´m doing a school project about the conservation laws. I enjoy physics very much and I come asking you for advice. This is not a homework question. After doing most of my work for the school project, I´ve been told that you can get a deeper knowledge...

Which disciplines would you call "Hard Sciences" vs. "Soft Sciences"? As you all know, from time to time people will say there are the soft and hard sciences. Although it's not always clear where the distinctions are, it's generally believed they are there. For the poll, please rate these...

Homework Statement See picture for clarity. There are 2 infinite wires carrying a current i, one wire does it in the upward direction and the other wire in the downward direction. They are separated by a distance L+2d. Between them lies a circuit such that the part that moves with a velocity v...

I recently installed a new hard drive as my old one was damaged. I couldn't retrieve anything from my old hard drive so I had lost some items of software (for example, I had to buy a new webcam as I no longer had the driver for my old one). However, for some reason my speakers do not work with...

What do you like to do to wind down? Let me set the scene. You have arrived home after work/class. Do you hit the books with a vengeance or do you play video games all night?

Homework Statement I'm struggling with this question here from my QM class. I have read all my material on Spin (both Griffiths, and a chapter in an Icelandic book). I'we done some problems, but I really have no Idea where to start with this one. It goes something like this: Two particles...

Homework Statement What is the lattice energy of KI? Given the information below. Heat of formation for KI = -328 kJ/mol Heat of sublimation for K = 89.20 kJ/mol Ionization energy for K = 419 kJ/mol Bond dissociation energy for I2 = 149 kJ/mol Electron affinity for I = - 295...

Homework Statement Design an experiment to determine the temperature outside. Materials: 2 blocks of wood stop watch Measuring tape The Attempt at a Solution I believe it has something to do with measuring the rate of flow of a viscous liquid down a ramp. The colder the...

Well it's very hard for me anyway! In both of the following expressions I have to make x the subject. Can anybody break them down for me and explain step by step how to solve them? 1. ax/b + cx/d = e 2. a/bx + c/d = e From looking at the answers I know that the solutions are as...

Can some one get smart in physics by hard working? What do you think? Have a nice day!

My wife's computer hard drive failed the other day. She backed up her data, but on a partition on the same drive. The failure was mechanical, the spindle motor froze up. So accessing the backup partition was also out of the question. I was afraid we were doomed, but I read about people who...

Hard problemT_T Charge on capacitor?? Homework Statement A 6.0 uF capacitor is charged up to 12V and subsequently connected through a witch to a 100ohm resistor. At t=0, the switch is closed. What's the charge on the capacitor 6.0ms(=.0006sec which is RC) after the switch is closed...

Homework Statement A line corresponding to light of the wavelength 519.8 nm is observed at an angle 12 degrees in the second-order spectrum of a diffraction grating. The grating is 1 cm in width, what is the line spacing of the grating? how many per centimetre? what is the lowest order...

original link: http://www.maths.cam.ac.uk/teaching/pastpapers/2001/Part_IA/PaperIA_2.pdf" Question 11F Dipkomsky, a desperado in the wild West, is surrounded by an enemy gang and fighting tooth and nail for his survival. He has m guns, m > 1, pointing in different directions and tries...

Homework Statement http://img163.imageshack.us/img163/7010/78614537.jpg o= student The position of the teacher is (d) from the mirror. mirror is 6m a) Calculate the maximum distance(d) of the corridor from the mirror b) Trace the diagram. Draw the ray diagram to support your calculation...

Homework Statement Prove that the product of two (nxn) non-singular matrixes A and B is non singular and that (AB)^{-1} = B^{-1}A^{-1} Homework Equations The Attempt at a Solution Well AI = A^{-1) we could perhaps try asing AA^{-1} and BB^{-1} ?? Hopeless. What type of...

Hi, In this other thread https://www.physicsforums.com/showthread.php?t=354424" I was hoping to get a scientific answer to my question. Apparently this was not an easy question or hypothesis that was easily falsified. I was sorry to see the subject turned into a unpleasant debate which ended up...

I have one test and i need to study classical mechanics , electromagnetism , statistical mechanics and quantum mechanics, anyone have some tips for maximize the time ??

My 1 TB external hard drive which currently houses about 850 gbs worth of media is having an issue. It won't display in my computer but it displays in disk management in black as 931 gb of unalloacted space. When I right click I can't assign it to a drive letter. When disk management pops...

I've heard from PhdComics, a fair few members here, and from a person I know that's not from the internets that becoming a professor is basically impossible. I have a hard time believing this. It seems to me that if you get a PhD at a decent university, did a legitimate thesis, and found a...

Problem: Given that the \Lambda has Q=0, B=1, S=-1 and the K(+) has Q=1, B=0, S=1 and the K− is its antiparticle, show that the following reactions are suitable for making strange particles. Calculate the threshold kinetic energy of the beam for producing these reactions in a ‘fixed target’...

Homework Statement the motion of a particle of mass m=10kg is described by the equation x= y= where x and y are in meters and t in seconds. Determine the velocity acceleration of the particle and the force acting on it. Homework Equations The Attempt at a Solution

go to an average 4 year college like the University of Santa Barbara , and have grades of C and just a few A's or B's , as opposed to if you have all A's and are going to Berkley ? Really curious about how employers view grades and what school you went to in making a hiring decision

Okay, here goes. The first one to figure it out will receive an HTML code in their email address (please give me yours when you answer) that is a virtual pet.:smile: Good luck! *** A man is coming from Switzerland on a train after his successful eye surgery. His eyesight was still poor, so if...