Hard Definition and 1000 Threads

Hard for me to say "Bye" to you-Tears for Physics I'm a undergraduate student in China,in a un-famous University,studying technology,which is because I didn't get enough marks in the exam of the entrance to university,and rejected by physics school.As you know or not,MARKS is everything in...

Homework Statement Test to see whether the following series converges \sum_{n=1}^\infty \sqrt[n]{2}-1 Homework Equations All we've done so far is integral test, ratio test, and root tests.The Attempt at a Solution As n approaches infinity, the term apporaches 0, so it may or may not...

Homework Statement Two long parallel wires, each with a mass per unit length of 40g/m, are supported in a horizontal plane by 6 cm long strings, as shown in the figure below. Each wire carries the same current I, causing the wires to repel each other so that the angle (theta) between the...

This is from my brother: I'm graduating this May, and I'm still unable to find any job offers. I interviewed with Fujitsu a few weeks ago but they haven't contacted me since. I'm a 4th yr Chemical Engineering major at UC Berkeley, but my GPA's low (2.8) and I haven't done any research or...

Homework Statement if you knew that the acceleration of a body is inversely proportional with square the time from the time interval (t=2'' to t=10''), and at t=2'' its velocity was V=-15 m/sec., and at t=10'' its velocity was V=-0.36 m/sec. if its postion from the origin point at t=2'' is...

Hello everyone :) As I was thinking about the logical outcomes of hard determinism, I found a weird one which states hard determinism is not necessarily true If hard determinism is true, Every single event at present will be due to the past events and all those past events due to the...

Homework Statement Question 20 You are traveling at constant speed in an airtight car with a balloon floating motionless next to you. Suddenly, you slam on the brakes so as to stop the car quickly. During decceleration, with respect to the car the balloon (a) moves forward; (b) remains...

hi guys, I'm not sure if this is the right place for this thread, but i'll do it anyways... I'm currently majoring in electrical engineering and having a hard time with physics... i already finished and don't really have problems when it comes to math like calculus I, II, III, and diffy-q...

not going to lie... this thing got me pretty frustrated. :bugeye: : you're going to need the picture in the link (print it or copy it on a piece of paper, it's pretty easy to draw. http://aycu37.webshots.com/image/10476/2004406912463755374_rs.jpg - The letters A-P are to be arranged in the...

|1|4|6|9| |D|-|-|-| |S|K|J|A| |Y|U|J|-| |S|G|B|-| |Q|F|J|A| |L|H|U|-| i would love to see anyone break this one i found it on a nothere site that said you could give it away but it took me 5 computer programs that crack encrypted text like that and a few books took me for ever.

A pond of water at 0°C is covered with a layer of ice 4.50 cm thick. If the air temperature stays constant at -11.0°C, how much time does it take for the thickness of the ice to increase to 9.00 cm? Hint: To solve this problem, use the heat conduction equation, dQ/dt = kA delta T/x and...

1. An object (height o) is placed at an object distance S in front of a converging lens. The lens is placed at a distance d<Si (image distance) in front of a very thick glass plate (index of refraction n, thickness larger than image distance). The surface of the glass plate is perpendicular to...

Homework Statement A hemisphere of radius a centered at the origin carriers a total charge Q uniformly distributed over its curved surface. Find the e-field at a point h on the z-axis. Homework Equations d\vec{E} = \frac{1}{4\pi\epsilon} \frac{dq}{R^2}\hat{R} The Attempt at a Solution Can...

Who can slove this one: f(x) = [ln(x) {{1-e^(3x)}^3}] / [{1+e^(3x)}^3x] f '(x) = ¿¿¿¿??

This is more of a question for study purposes...I've been studying a little bit for my Dynamics exam, but I just don't feel like doing these problems is going to prepare me for the exam well. Does anyone know of a good online source for dynamics problems?

Hello, I'm stuck making a hard desission. I am a second semester sophamore at a small private school and I would like to graduate with a dual major in Physics and Computer Science with a minor in Business Admin. The only thing that bothers me is that my school only offers a B.A. in physics...

I have a SATA hard drive that I need to format, but the only person I know with a SATA system is my boss...so when he left today, I opened his computer. He has two SATA hard drives, and I unplugged one and connected mine. It didn't recognize the new disk, and plugged his back in. Although I...

Homework Statement There are n > 3 points in the plane such that any three of the points form a triangle of area \leq 1. Show that all n points lie in a triangle of area \leq 4. Homework Equations None. The Attempt at a Solution This is hard to discribe since it is...

Homework Statement A trough has an isosceles trapezoidal cross section as shown in the diagram. Water is draining from the trough at 0.2m^3/s At what rate is the surface rea of the water decreasing? Dimensions are: base width=0.4m, top width= 0.8m...

Homework Statement I have a linear map T:M(2x2) -------> M(2x2) defined by T(B) = [2 3; 4 0] * B Find a 4 × 4 matrix representation of this linear transformation with respect to the basis of M(2×2) Homework Equations T(B) = [2 3; 4 0] * B and the basis for M(2X2) is: [1 0; 0...

The hard iron bar called irony, that is. The irony of toothaches. My sadistic dentist informs me, my wisdom teeth are coming in all wrong and will necessarily need amputation. Poor hypocrite me, I had declared I'd sooner die naturally than go under the knife; now I've given in, to schedule the...

A "Possibly easy for you, but hard for me" Question about Sudoku How to calculate the maximum number of valid patterns on a 9x9 Sudoku board? I was coding a flash application which is basically a "sudoku solver". This question is not related with qhat I'm doing but just curious. Please...

I need to know how to completely wipe my Hard Drive on a Windows XP. There is a virus that will not get off no matter what I do, I have run all antivirus and antispyware devices there are and I would much rather wipe my HDD right now. So anyone know anything I could do.

Interesting problem I came across, yet I'm having some trouble with it: Here are a few of the next generation of experiments currently being planned for constraining cosmological models. Not all of these are groundbased: DES:https://www.darkenergysurvey.org/"...

Hi, so recently I bought an external hard drive and started transferring my data into that to get more space in my internal one. I then noticed that I've used up almost 50% of my c drive but I don't know what it's used for and don't see anything that would use up this much memory. Is there any...

I am currently a student in a Engineering based calculus class and well things are about average in terms of my performance, Just there is one thing that I just don't get and for that matter have never gotten. That is trig functions, I just don't understand them. I've tried memorizing and...

Hi I tried this question a couple times, couldn't figure it out, thought maybe you guys could help. 1. The maximum load that can safely be supported by a rope in an overhead hoist is 400N. What is the maximum acceleration that can safely be given to a 25kg object being hoisted vertically...

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...