Hard Definition and 1000 Threads

  1. S

    Can We Achieve Over 200GB in 2.5 Mobile Hard Drives?

    2.5" Mobile Hard Drives Why its capacity is still at about maximum 100 GB, seldom has 120GB. When can we increase it to >200GB ? Can we increase the platter diameter to 3.5" but the drive remain flat so that it can fit nicely into the notebook? This will increase its capacity.:biggrin:
  2. J

    Finding the Period of a Physical Pendulum Attached to a Solid Sphere

    I can't figure this one out: A point of the surface of a solid sphere (radius = R) is attached directly to a pivot on the ceiling. The sphere swings back and forth as a physical pendulum with a small amplitude. What is the length of a simple pendulum that has the same period as this physical...
  3. T

    Centripitalforce problem (hard)

    Ok, I've been looking around for a answer for this , but haven't found one. So in hope for some help, ill post the problem here: A pipe has the form as a half cylinder. On the top of the cylinder its placed a item that can slide frictionfree on the cylinder. The cylinder gets a microsmal...
  4. Mk

    Preparing for Earthquakes: Keeping Bottled Water on Hand

    This week the water was out twice, the power was out for a few hours, and we just had a magnitude 5.8 earthquake 'bout five miles southeast, and 30 miles down. It was scary. We get earthquakes a lot 'round here. This one seemed pretty calm, then for about .7 seconds it was crazy! Floor musta...
  5. B

    Why do people think physics is so hard?

    I commonly hear the words "Physics" and "Genius" combined in many sentences, which seems to be a bit of a misnomer, considering that most of physics is rather simple, and only gets complicated once you have to apply hundreds of possible changing factors in a problem. Or am I just being...
  6. L

    Understanding Hard Water & Sodium Carbonate Softening

    Hey everyone, How does sodium carbonate soften hard water? Thanks, Lou
  7. Pengwuino

    Why Consider a Name Change to Math Is Hard II?

    I don't really know what MIH's name is all about, but I think i should change my name to math is hard II. I hate math, math hurts my brain :cry: :cry: :cry: :cry:
  8. S

    Urr, this doesn't seem like it should be very hard but well, good 'ol me

    For this problem assume the "EM spectrum of astrophysical relevance" is between 1m and 10^-3nm. Calculate the fraction of the visible light by assuming a) a linear scale and b)a logarithmic scale. Explain the difference.. hur? I'm guessing this is one of those math skills I've either...
  9. S

    Answers to Hard Questions for Ridiculously Difficult Extra Credit

    I would like to know the answers for these questions for my ridiculously hard extra credit. I have researched these questions and found little information and I really don't know what else to do (I need these points bad) Whats the difference between Glucose Fructose and Galactose and how does...
  10. T

    Studying Am I the only one that find ODE hard?

    I love math, but it seems love does not conquer all: last semester, my average turns out to be B+, the bare minimum required to stay in the honours program. I told my professor that I study already a lot, and he told me that perhaps I was studying the wrong way. So, how does one study for math...
  11. T

    Challenging Integral: Evaluating \int 3e^{2x}\sqrt{x+1}\ dx for ODEs

    Hi, could you please help me in evaluating this integral? \int 3e^{2x}\sqrt{x+1}\ dx I got to this point during solving one ODE and have no idea what to do with this one. Thank you.
  12. Ivan Seeking

    Can You Use a Multi-Hard Drive Dock to Boot Different OS on a Dell Laptop?

    Is it possible, or better yet, is there a product available that will plug into my Dell laptop hard drive slot, and connect to a rack of hard drives that allows for anyone to be selected as the boot drive? In fact, I don't even need access more than one drive at a time, but I do need to be able...
  13. zoobyshoe

    Is Human Evolution Responsible for Mathematical Challenges?

    http://www.origins.tv/darwin/pagetree.jpg I was googling for a hominid timeline when I stumbled on this chart which seems to be saying that all our struggles up from a primordial protoplasmic globule have been leading us to Barbi. http://www.origins.tv/darwin/trees.htm
  14. H

    Verifying a Hard Trigonometric Identitiy ()

    My Pre-Cal teacher gave us this problem today. I have worked on it for a very long time and have goten no where :confused:. I was wondering if anyone had any ideas on how to do it, or even where to start. I started it myself with using the pythagorean idenities for the left side, then the...
  15. F

    4 hard (long) problems- problem set.

    :confused: 1)A physics professor reaches for a well bucket of mass m, the professor hits a lever and the bucket falls into the well. The bucket is suspended from a rope of negligible mass which is wrapped around a sold cylinder of mass M and radius R. The cylinder is mounted on a frictionless...
  16. S

    Get Help with Solving a Complex Equation: Tips and Tricks

    Hello! We've got to solve the following equation: i \ Re \ z+Im \ \bar{z}+\pi=|z|+arg(z) with arg(z)\in[0,2\pi) Please don't solve it for me. Give me a hint first.
  17. Oxymoron

    Is the Set of Cosine and Polynomial Functions Dense in C(S, ℝ)?

    Question Let S = \{(x,y) \in \mathbb{R}^2\,:\,x\in[0,\pi],\,y\in[0,1]\}. Deduce whether or not, \left\{\sum_{m,n=0}^M a_{m,n}\cos(mx)y^n\,:\,a_{m,n} \in \mathbb{R}\right\} a subset of C(S,\mathbb{R}) is dense. I was thinking no. And this is not a guess. My reasoning is as...
  18. D

    Solving Complex Algebra Equations with Calculator Tips - Ti-83 Tricks

    hi this is a hard algebra qestion i have these 2 formulas 12-x^2 -2xy = 0 12-y^2 - 2xy = 0 for some reason x and y are both 2 how do you get this i tried and got y= 6/x -0.5x tried to sub into second one but gets messy any way to do this on a calculator by any chance i have a...
  19. K

    Advice Needed: Dealing with a "Rock and a Hard Place

    I need some advice. About a year ago I found out that my girlfriend had cheated on me. Two weeks ago we broke up, and I won't go into details suffice to say that we are still friends. Now a close friend of mine is having a party to celebrate his 21st this weekend and both my ex and the guy she...
  20. Q

    External Hard Drive Pros & Cons: Buyer's Guide

    I am thinking about getting an external hard drive, (just buying a harddrive and case). Can you guys give me some pros and cons of an external hard drive compared to an internal one.
  21. D

    Max Volume Hard: Find x,y,z for Maximum Volume

    Maximum Volume Hard! hey guys got this maximum volume question so bloody hard ! i got most of the steps right but got stuck on the last section (V) 1. A closed box has a surface area of 18 square metres. let the dimensions of the three sides x,y,z and let volume be V (i) write the volume V...
  22. A

    Discover the Truth About Light Speed: A Lorry Experiment Explained | 1905 Theory

    help , a hard question! hi friend , i have a question please help. there is a lorry with a boy inside it handing a lamp & there is a boy outside the lorry. When the lorry is in a stationary position both boys notice that the light is reaching to the both sides ( front & back) of the lorry at...
  23. R

    Basis, kernal, image, transformation, etc (not a hard one)

    I hope everyone could understand my matrix notation! T: M22 -----> M22; T[a b; c d] = [a+b b+c; c+d d+a] I found the the basis for ker(T) to be [1 -1; 1 -1] im having problems finding a basis for im(T)? I know that it has to be dim3! so far i have: im(T) = {[a+b b+c; c+d d+a]/ [a b...
  24. I

    I have a hard time recognizing transformations of functions.

    hello everyone can anyone give me any tips on recognizing compressions and expansions of functions? ie. vertical expansion, horizontal compression
  25. -Job-

    What is the Computational Complexity of Rearranging a Crossword Puzzle Grid?

    Given an n*n crossword puzzle grid composed of n^2 boxes (black and white), consider the problem of determining the size of the biggest square composed entirely of black boxes that can be created by first rearranging the rows and then the columns. Determine the smallest k such that O(n^k) is...
  26. D

    Can You Solve These Challenging Partial Differentiation Problems?

    HI GUYS i just have some hard problems on partial differentiation... hope you guys can help out 1. find "day z / day y" its the funny backwards 6 symbols instead of the normal differntiation symbole if z=4y^3 * sqrt(x) - ln(4xy^3) + 2x i did this: i diffenriated 4y^3 * sqrt(x) with...
  27. M

    How to Use Implicit Differentiation to Solve for y' in xy^1/2 = 1 + x^2y

    How do I correctly differentiate this using implicit differentiation: xy^1/2 = 1 + x^2y I got to here before I started wondering how I would properly isolate y': ((1/2xy)^-1/2)y + y'x = 2xy + x^2y' How far off the beaten path...
  28. I

    Torque and Force Equilibrium in a Rotating Plank

    I have soluted these so but I need an explanation of what I've done. An even 2,23m long plank is turn-able around its one end. The plank is hold up in an horisontial way with a vertical upp-force on 268 N The force works at 1,52 from the turn-able point. Decide the planks mass. What I did...
  29. I

    How Do You Calculate Backward Power and Forces in Physics Problems?

    A competition-cyclist closing the goal. Towards the end-rush she raises her speed from 12m/s to 20m/s on 6.5s. The Cyclist and the cycles masses are together 70kg. Calculate acceleration The accleration is 1,23 no problem i calculated that but the next question is hard. The Cyclist pushes...
  30. B

    Mastering Kirchhoff's Law: Solving for 5 Currents in a Complex Circuit

    The point is to find currents i1,2,3,4, and 5 in the picture. R1 = 14 Ohms R2 = 6 Ohms This is my work so far. 5 Currents, 5 Loops, 5 Equations, that is the rule (or so I think) The way I am looking at it, there are 6 Loops, so if someone could reduce it to 5 that'd be of some help...
  31. T

    Hard word prob involving cars (HELP ME)

    Ok, here is the prob. You are arguing over a cell phone while trailing an unmarked police cruiser by 25m; both you and the cruiser are traveling at 110km/h. Your argument diverts your attention from the police cruiser for 2.0s (long enough to look at the phone and yell "I won't do that!"). At...
  32. Norman

    How to attract more women to hard sciences?

    Any ideas from our very astute members on getting more women involved in math and science? Think of all the brain power we are missing out on? Would it take a dramatic change in culture? I guess I am taking a fairly egocentric view here, since I am only familiar with the US. Are their any...
  33. H

    Relativity question for Hard SciFi writing

    I'm working on writing some hard science fiction stuff, and I have a question I was hoping you guys could help me with. See, my training is primarily in math and chemistry, and it's been quite some time since I've really had any dealings with more than just the most basic concepts in general...
  34. M

    Projectile Motion Problem. Very HARD

    Well... for me. A Basketball Star covers 2.80m horizontally in a jump to dunk the ball. His motion through space can be modeled as that of a particle at a point called his center of mass. His center of mass is at elevation 1.02 m when he leaves the floor. It reaches a maximun height of 1.85...
  35. I

    Solve a Challenging Kinematics Question: Depth of a Shaft after 6.2 seconds

    I was wondering how u solve this kinematics question: a banana peel is dropped from rest down a shaft. 6.2 s later the sound of the banana hitting the ground is heard. how deep is the shaft i think: v1= 0m/s a=9.8m/s^2 i'm reallu stuck on this one.. don't know where to go from here.
  36. K

    Can the Vector Sum OC Lie on, Inside, or Outside the Circle?

    Hard Vector Question Much Help Needed! Points A and B are any two points on a cirlce with a center O. The heads of Vectors OA and OB lie on the circle. Vector OC is the sum of OA and OB . In the Diagram, the head of OC lies outside the circle. Explain your answer to each question. a.)Is it...
  37. D

    How Can I Convert My Old Laptop Hard Drives into External Hard Drives?

    I have three laptops which no longer work. I want to take the hard drives out of them and make external hard drives for my new laptop. What do I need to do? I have no idea where to even start.
  38. V

    Defining Matter: Can You Help Me Generate Ideas?

    Care to venture ideas? i need some...
  39. B

    Is Punishment Justifiable Under Hard Determinism?

    *It is often held that punishment under pure (hard?) determinism is irrational as the criminal had "no free choice" NoT to commit a crime, and cannot thus be held responsible. Of course, I will have to cite my sources for this statement (no doubt about it!), but moving on... But, why must...
  40. Les Sleeth

    Is Archaeology More of a Hard Science than a Social Science?

    With the development of scientific techniques, archaeology has become more than digging for artifacts and buried communities. It seems to have become a broader field sometimes generalized as prehistory. An argument a historian friend of mine and I have had is over the importance of prehistory...
  41. D

    Projectory: Super Hard Apparently From The Military Gah Hard

    Projectory: Super Hard Apparently From The Military! Gah Hard hey all i got a very difficult question, apparently some guy from the military working with projectory wrote this and below is the questions and i could not do sections 7 & 8 at all below i have posted my answers not sure if theya...
  42. D

    How to Find Vector Components and Parametric Equations for Plane Intersections?

    hi all got some problems with vectors so waswondering if anyone can check what I've done is correct thanks question1. find the vector component of 2i+j-k in the direction of i-3j+2k basically i use the rule a=(v*w^)*w^ w^= i-3j+2k / sqrt(14) thus v=2i+j-k therefore a=(2i+j-k)*(...
  43. Evo

    Why are parents putting so much pressure on their kids?

    My daughter is a bit distressed, she got a call yesterday from a friend to tell her that a girl they knew had just stabbed her mother to death. My daughter's best friend had been the girl's debate mentor last year. She was a nice, intelligent girl, but was known to do drugs and party hard...
  44. D

    Can Boolean Algebra Simplify Complex Logical Expressions?

    Boolean Algebra Hard! hey all, got stuck on some boolean algebra just wondering if you all can check my working out thanks :) basically the ` represent bar's and in the example no. 1 the p is barred, r is barred,and the overall function is barred hope you get the gist of things thanks 1...
  45. U

    Troubleshooting Hard Disk Reformatting Issues

    I am trying to reformat my hdd when something weird happened. I have a P4 desktop and I wanted to reinstall everything on there. So I booted from the windows CD and it formatted and installed windows XP sp1... when the computer restarted, it said that some file was missing and it wouldn't start...
  46. R

    What Is the Minimum Tension Needed to Move a Toaster on a Countertop?

    This one's not too hard...A 1.30kg toaster is not plugged in. The coeffficient of static friction b/t the toaster and horizontal countertop is .350. To make the toaster start moving, you carelessly pull on its electric cord. a) for the cord tension to be as small as possible, you should pull...
  47. J

    How can I uninstall Windows 2000 and keep Windows XP on my computer?

    I purchased my father a computer that had windows 2000 on it. He wanted me to upgrade it to xp, so I purchased a windows xp oem disk from new egg. I installed it on the computer. I thought that it would simple upgrade to xp, but now windows xp and 2000 are on his computer simultaniously! When...
  48. K

    Magnetising a hard magnetic material

    Is it possible to magnetize steel (hard magnetic material) with an ac source?
  49. R

    Hard Drive Problem: Troubleshooting a Quamtun Bigfoot 6.5 Gb

    I found an old hard drive in a suitcase. It belonged to my old Compaq computer. It is seven years old. Quamtun Bigfoot 6.5 Gb. It was the main hard drive in that computer. I tried to install it in my new Compaa, which is also a Pressario, but only a year old. It is in the second ide drive as...
  50. Astronuc

    Our Hard Drive Which art internal Volume C by name

    Our Morning Prayer :biggrin: Our Hard Drive Which art internal Volume C by name; Thy code be clean, Thy fonts be seen On screen as they are on paper. Give us this day our documents, And lead us not into fragmentation But deliver us our data. For thine is the SCSI, And the EISA...
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