Hard Definition and 1000 Threads

In a scattering experiment, an aluminium foil of thickness L = 10E-6 m is placed in a beam of intensity of 6E12 particles per second. The differential scattering crosss section is known to be of the form. \frac{d\sigma}{d\Omega} = A + Bcos^2 (\theta) where \theta is the...

My 18-year-old baby sister just got dumped by her boyfriend. The reason: he is going into the priesthood. This has got to be one of the strangest breakup stories I have ever heard. Poor thing is crying her eyes out. :cry: She was crazy about him.

physics B problems :( hard hard A single cable supports an 837-kg elevator car. What is the tension in the cable when the car is moving with a) constant speed, b) an upward acceleration of 3.21 m/s^2 and c) a downward acceleration of 3.21m/s^2 I'm not totally lost. Since the T is directed...

A uniform chain of 8.00 m lies stretched out on a horizontal table. 3m of it is hanging of the end of the table. Determine the speed of the chain as all of it leaves the table, assuming a coefficient of kinetic friction of 0.400. Here's what I have done so far: Let x represent the amount...

A 2.00-kg aluminum block and a 6.00-kg copper block are connected by a light string over a frictionless pulley. The two blocks are allowed to move on a fixed steel block wedge (of angle 30.0) as shown in Figure P4.53. Making use of Table 4.2, determine (a) the acceleration of the two blocks and...

Well, it's hard to me at least :frown: http://img169.imageshack.us/img169/206/questionzg0.png We are using Schroeders book and this problem was given to us from I assume the book by Reif. We haven't seem to have gotten far enough along in Schroeders book to have gone over this though. I can...

Im studing for a math competition. One of the probles is as follows fnInt( (Ln(x+1)/(x^2 +1)),x,0,1) If you don't know that notation. it means Integral from 0 to 1 of Ln(x+1)/(x^2 +1) OBVIOUSLY NO CALCULATORS... I am looking for a solution, not an answer Thanks ~rosie

i need to prove the following: 1)let a,b,c be acute angles, if tg(a)tg(b)tg(c)=1 then sin(a)sin(b)sin(c)<=1/2sqrt2 2) prove that for every x,y cos(x^2)+cos(y^2)-cos(xy)<3 for the second question i tried to use the fact that (x^2+y^2)/2>=xy and the fact that on some intervals the function cos...

I received two E-Mails from Math Is Hard today and she seems to be trapped in the old server unable to get here. She says it's a ghost town except for Wolram and Robphy who wander in and out occasionally. I think we need to get a team of dog sleds together to go up the snow bound pass and...

:cry: some other problems if anyone has any ideas 1. the coefficient of static friction between the 3.00 kg crate and the 35 degree incline is .300. What is the magnitude of the minimum force, F, that must be applied to the crate perpendicular to the incline to prevent the crate from sliding...

The press box at a baseball park is 38.0 ft above the ground. A reporter in the press box looks at an angle of 16.6° below the horizontal to see second base. What is the horizontal distance from the press box to second base? ____ ft How do you figure that out? You don't have a hypotenuse...

A treasure map directs you to start at a palm tree and walk due north for 12.0 m. You are then to turn 90° and walk 13.0 m; then turn 90° again and walk 5.00 m. For each of the four possible locations of the treasure, give the distance from the palm tree and the direction, expressed as an angle...

A torpedo boat with a mass of 50 tons is moving at 10 knots when it fires a 250-kg torpedo horizontally with the launch tube at the 30 degree angle. The torpedo has a relative velocity to the boat of 10m/s as it leaves the tube 1) Determine the momentary reduction v in forward speed of the...

I think many of us share the characteristic that when we get deeply involved in solving a hard problem (whether in math, physics, engineering or whatever), we tend to fuzz out on the world around us and get tunnel vision on the problem and possible solutions. You have to be careful to not do...

Answer selects two natural numbers from the range [2,100] (x, y). He tells one man Sum' 's' (where s = x+y) and another man 'Product' 'p' (where p = x*y). The men are asked to find x and y. Both men have perfect logic. Know that the starting numbers were selected from [2,100] And are good...

An ice shed powered by a rocket engine starts from rest on a large frozen lake and accelerates at 40 ft/s2. After some time t1, the rocket engine is shut down adn the sled moves with constant velocity v for a time t2. If the total distance traveled by the sled is 17500 ft and the total time is...

Ugh. My last projectile motion problem. I just don't get one thing in this problem. The initial velocity and the acceleration. Please help me with this problem: A rocket is launched at an angle of 53 degrees above the horizontal with an initial speed of 100m/s. It moves for 3s along its...

Given that the diameter of the moon is 3,480 km, and using a meterstick plus a 25¢ coin or any flat round object, estimate the distance, D, from the Earth to the Moon. Need to provide labeled diagram and calculation. And answer the question on next page. How can you improve the...

find the minimum distance between the origin and the surface z^2=[8-y^2-x^4*y^2]/2 so d=sqrt(x^2+y^2+z^2)^(1/2) where for z^2 I sub in that expression in x and y? so then I take the partials of d wrt to x and y and set those equal to 0, then I solved that system of equations and got x=+-1...

I need to attach an ATA/IDE hard drive to a Linux computer and I'm pretty clueless about how to go about it. I have installed Linux on my desktop computer's SATA hard drive (pretty much the only computer available to me that I can open up and poke around in) and I also have a linux livecd...

prove if a+b+c=1 ,a,b,c>0 so (1+1\a)(1+1\b)91+1\c)>=64

Exactly how hard is it to get in? I would probably do the mathematical logic program and maybe pre-phd program...? My thesis of my thesis is just posted... https://www.physicsforums.com/showthread.php?t=132252 Kinda sounds like I'm looking for a bridge between set theory and string...

Hi, I have been set a sheet of questions for homework and there are two which I cannot do. Any help you could give would be greatly appretiated. 1) I have tried doing this but keep getting into cycles of inputting equations into it and just going around in circles. 2) This is a two...

Question: A pyramid with horizontal square base, 6.00m on each side and a height of 4.00m is placed in a vertical electic field of 52.0 N/C. Calculate the total electric fluc through the pyramids four slanted surfaces. I know you can figure out the flux through the base = 36 m * 52.0 N/C...

Hello there ! I have been trying to figure the following problem out but unfortunately I have not had any obvious success. It is about Kinetic Energy: A stone is falling from the roof of a house down to the ground. In the last second of the fall, the stone's energy increases of 293 J. How high...

1 Celsius= 274.15kelvin Right So 274.15+274.15=548.30 Kelvin(2 Celsius) But 2 Celsius Is= 273.15 I am Confused Help

This is my 1st semester in 2nd year course, sounds to hard and I do worry. Did anyone study something like this description. ELE 302 Electric Networks Three phase circuits- 3-phase voltages, Y and delta-connections, balanced three-phase systems, power calculations, two-wattmeter power...

it is said in our book that when matter undergoes changes whether physicaly or chemically, the atoms are merely rearranged. no atom is created nor destroyed. (the law of conservation of mass) but isn't it that we are made of atom then if I am made up of atom an atom is created when I am...

Electrical Engineering Program was very, very hard. Six courses per semester, it was suicidal but manageable. I could not imagine that it was going to be so dificult in my first year of engineering program. Not many students are left in the program. I was a top student in high school but...

I have four partitions, two of Windows and two of Linux. The Windows partitions have sizes 129 GB - C drive and 4 GB - W drive. When I check the amount of used space on C drive directly by right clicking on the C drive icon and then clicking properties, I get 55.1 GB used space and 74.1 GB...

Hi everyone. Thanks for reading this post. I'm looking for a little guidance on how someone whose training is outside the hard sciences can break into a scientific career path. I know that it will inevitably involve going to back to school, but perhaps there are jobs I could do in the mean...

I have an occasion to earn some money over the summer doing that building insulation or something like that, and I'm not sure whether I can handle it, meaning is it hard to do? After all, I don't know what insulation really is but from what I got by google, you just put some stuff to warm up a...

George Washington, first President of the United States of America, is purported to have thrown a silver dollar across the Potomac River from the lawn of his home in Mt. Vernon...The Potomac is approximately 5280ft across at that point. Washington was 6foot2 and threw the coin at an initial...

That Barbie(cue) thread got me to wikipedia Barbie, and there it says that the phrase barbie said was not "Math is Hard" but instead "Math Class is Tough" And they had a source too :rolleyes: Source: http://query.nytimes.com/gst/fullpage.html?res=9E0CE7DE103AF932A15753C1A964958260MIH is this...

Calculus II is giving me a hard time! Im embarrased to say this but I've taken Cal II 2 times already and can't get passed it. I don't understand what I am doing wrong. I am taking it this summer for the sake of getting it all over with quickly. I was confident when I went into class because I...

I am trying to hook up my old hard drive to my newer computer. I've done this before on a different computer with success, but this time it won't work. My old hard drive is from a Windows 98 computer. It is a Quantum Bigfoot TX. My newer computer is Windows XP. I unplugged my CD/R cables...

Okay so I have this calculus teacher who is crazy and gave us this problem on an exam. I don't know how to figure it out and I tried getting explanations but they were really hard and complicated.:confused: :confused: :confused: So here is the problem x^2 [f(x)]^4 + xf(x) = 6 f(2) = 1...

:confused: Can someone help me please? :cry: My teacher for Math Summer Camp gave me this Problem. She never told us the answer, I would really like to know. What number comes next? 22272 24742 25862766 2674

Congrats to Finland and Lordi to their first victory in the Eurovision Song Contest!:biggrin: :biggrin: :biggrin: I don't even know what to say about the performance...:biggrin: :eek: :-p http://eurovision.lordi.org/ http://www.eurovision.tv/english/index.htm http://www.lordi.org/

In general, places like MIT or Caltech or Stanford, and other places that aren't as "good"(yah I know good's relative and subjective, hence the quotes)I was talking to a guy who had a 3.9 GPA, research experience, and from my own personal knowledge really good at math, and he didn't even get a...

Ok i need help on this for my grade, very crucial. I have 100 posts on another forum, not much but I hope it will give me a little credibility. I am willing to pay 50$ via paypal if you are willing to talk with me individually, but only if you know what you are doing and how to solve this...

I want to know how hard is each of these forms of Science&Technology. I studied Electronics ENgineering for 2 semesters and that stuff was hard! I didn't know electronics could be so hard. So witht hat I decding to go into another field. I want to know the difficulty level of each of the...

I just came across the biography of George Dantzig. From http://en.wikipedia.org/wiki/George_Dantzig" Gosh!

I have a problem which i ahve simplified to this http://img63.imageshack.us/img63/3998/bigproblem7hg.jpg I want to calculate the reaction forces but how? Torque equation give this 2F=0 Force equations give this 2F=0 Thx for any help given ...

I have a desktop with two hard drives in it. I'd like to use it for audio recording, so it must be exceptionally quiet. At the present time the loudest components in my computer are the already quiet hard drives. In order to contain this sound I plan to surround my hard drives, with some...

http://img325.imageshack.us/img325/1876/mathproblem2gt.jpg Need help solving these in the MOST CREATIVE way possible. Thanks

g(x) is a function of x that we do not know its form. y(t) =(1/2) integral 0-->t [ sin(2t-2x)*g(x) ]dx i tried to use integration by substitution and by parts but the problem is that g(x) has an unknown form. the actual problem is that y" +cy' +dy = g(t) y(0) = y0 y'(0) = y'0...

For one of my classes I need to implement a model of a charged particle that is giong through electric and magnetic fields. I can assume these constants: m=1 q=1 x(0)=0 t-scan: [0 1] Now the questions: 1) Simulate the constant acceleration analytic case and plot the result. Add the...

When I was in college I had a recording of The ThreePenny Opera, the well known Broadway/English translation by Marc Blitzstein, and some kids from Germany who'd heard it complained that it was a poor translation: the original was much down and dirtier, more crude and gritty. Every once in a...

Ok, so up until this morning I thought my hard drive was only 20GB (Dell Latitude D800), because that is the size of my C drive and no other drives are visible when I open My Computer. But this morning I was thinking there is no way my computer only came with 20GB, so I went into the System...