Hard Definition and 1000 Threads

2D Kinematics Please Help! I tried so hard Relative to the ground, a car has a velocity of 17.3 m/s, directed due north. Relative to this car, a truck has a velocity of 20.5 m/s directed 48.5 ° south of east. Find the (a) magnitude and (b) direction of the truck's velocity relative to the...

I'm trying to prove or disprove the following: Let a_1, ..., a_n be natural numbers such that the least common multiple of EVERY n-1 of them is equal to lcm(a_1, ..., a_n) = m. Is it true that a_i = m for some i? The method I've tried so far is to build systems of equations using the...

Homework Statement I am trying to solve problem 1.4 from Statistical Mechanics by R.K. Pathria 2nd edition. This is the problem: In a classical gas of hard spheres (of diameter \sigma), the spatial distribution of the particles is no longer uncorrelated. Rougly speaking, the presence of n...

Hi guys I need help with my pc I use for my projects and programming.It doesn't want to boot from the hard drive and really need it to because I have some very important information in it. I am not good with hardware(hope one day i will) but have tried everything I can to get it working...

"Hard" Spectrum What exactly is meant when a spectrum is said to be "hard" or "soft", or "harder"/"softer" compared to a different spectrum? Cheers, Nick

Hello all. I have a dell inspiron 1525 laptop, and I've had it for about 4 months. I've been downloading music here and there, but nothing too major. Earlier this week I realized that my computer had used about 70gb of memory, and I had no idea where it was. So I downloaded a disk analyzer...

Homework Statement A cannon is firing from an elevated position 100 m above a target 800 m away. The ititial velocity of the cannon is 500 m/s. Homework Equations Vx = VCOSq Vy = VSINq a = (Vf - Vi)/(t) Vf = Vi + a t s = 0.5 (Vo +Vf)t Vf2 = Vo2 + 2aS S = Vit + 0.5at2...

I started learning limits and I have some difficulties qith this question; Find the limits or say why they do not exist. a)lim_{x\rightarrow2}\frac{\left|x^2 + x -6\right|}{x-2} b) lim_{x\rightarrow0}\frac{\sqrt{4-x}-2}{\sqrt{x+1}-1} 3. The Attempt at a Solution a)we have an...

It's done me good service since 2002, but about three days ago, my desktop machine refused to boot. So I did some digging on the Microsoft help site, configured my BIOS to boot from CD, and stuck in my Windows XP disk to attempt to repair Windows. Attempted to start Recovery Console, but it...

Homework Statement A long line connecting Earth and the Moon, at what distance from Earth's centre would an object have to be located so that the gravitational attractive force of Earth on the object was equal in magnitude and opposite in direction from the gravitational attractive force of...

I am solving the following simple looking nonlinear PDE: (\partial f / \partial t)^2 - (\partial f / \partial r)^2 = 1 Using different tricks and ansatzs I've obtained the following analytic solutions so far: f(r,t) = a\, t + b\, r + c, \,\,\,\, a^2 - b^2=1. f(r,t) =...

My background is calculus through differential equations and linear algebra at a community college. How hard is an intro to probability theory at a school like UCLA?http://www.math.ucla.edu/ugrad/courses/math170ab/170Aoutline.shtml I'm thinking about taking it this fall.

I was out in the bushes this weekend. Monday I managed to get stung hard by a hornet. Much worse than the usual flyby stinging since I was managing to squash it at the time. Don't recall seeing these before. It had a yellow jacket color pattern, but skinny with a straight rather than...

http://img295.imageshack.us/img295/2538/q1qj1.th.jpg http://img410.imageshack.us/img410/307/a12ku8.th.jpg I am having trouble with the final part of this question - part f; I can do all the previous parts. I have attached the questions and markscheme, and so woulkd appreciate it if someone...

What do you know about the hard sphere model? and for this model used for colloids and polimers in fluids?

Last night Tsu fell and broke her hip, and immediate surgery was required. She will be in surgery tonight and should be able to come home tomorrow. As of right now, she is in the hospital waiting for an operating room, and I came home for some odds and ends, and food. Apparently she just...

im stuck on the top question on part B i can do the difference of 2 squares on the LHS but how do i get rid of the cosec²x - cot²x ?? Thanks

[SOLVED] I think of it as hard proof by induction Homework Statement given for the sequence a_1,a_2,a_3,a_4,...,a_1=1 and that a_{n+1}=(a_n+\frac{1}{a_n})^{\lambda} where\lambda>1.Prove by mathematical induction that,for n \geq 2 a_n \geq 2^{g(n)} where g(n)=\lambda^{n-1}...

when I was running a standard check on my HDD I found when I ran my disk filler (to completely delete my files PM me if you don't understand) i found 2Gb would not write i checked the binary point only to find it was empty.. absolutely nothing (just before anyone says my OS is on a separate part...

I just graduated this May with a B.S. in applied and pure mathematics. I plan on coming back next semester to do 3 research projects and reapply for graduate school, but in the meantime I was hoping to find a summer job. I am having an absolute nightmare finding a job. I would have thought...

I have a HP iPaq 1900 that only has an SD card slot and an iPod hard drive with 20gb and ata 6. SD cards are too expensive and I want to make use of my hard drive. Is there a way you can think of that can connect the hard drive to the iPaq? I was thinking of buying an SD card...

Hello everybody.. my name is Rohan Prabhu and I am tanked. The results of the various entrance exams to colleges that i gave have started coming in.. and i have tanked like hell in all of them. Now there are two options in front of me: Either take whatever college I get.. whatever degree I get...

Help me….my hard disk is damaged! Hi everyone , I am employed as a manager in a firm. I have a problem that I had like to talk about. My system was working fine the other day, but while copying a file by nero….the system hanged and I had to restart it. But I got a disk boot failure error. Then...

Hello! I need to know whether the hard disk is on or off during the following states (in windows vista): -During Standby -During Hybrid Standby -During Hibernation Note that I mean by on that the hard disk is spinning regardless if it is reading,writing or doing nothing. Please I need...

heat! so hard. true or false 1.The entropy of a system can never decrease 2.All Carnot engines are reversible 3.It is impossible have a net transfer of heat from a cold reservoir to a warm reservoir 4.A refrigerator lowers the entropy of the volume inside 5.If the temperature...

hard kinematic problem, need...help...pls:) Homework Statement A policeman (on a motorcycle, with the engine going) is hiding behind a bush on the side of the road when a speeding truck passes with a speed of 96.5 km/h. As the truck passess he sets off with an acceleration of 1.83 m/s, which...

Homework Statement Solve the equation: cos2x - sinx = (1/2) for [0,2pi). Homework Equations sin^2x + cos^2 = 1 The Attempt at a Solution cos^2(2x) - sin^2x = 1 1 = 1 Infinite Solutions?

I am trying to prove that the Limit as p approaches infinity of {integral from 0 to 1[|f(t)|^p dt]}^(1/p) is in fact equal to the max of |f(x)| between [0,1]. Any suggestions I am sure I need to set the limit to less than or equal to and greater than or equal to the max but i don't quite...

kinematic question, i think it's hard:( Homework Statement Two camels leave the spinx at time 52.5 s apart. The first moves off with a uniform acceleration of 1.30 m/s2, which it maintains for 1.92 s. It then continues with the acquired speed. The second camel moves of with a uniform...

I'm just wondering why PMMA (polymethylmethacrylate) is hydrophobic and does not attract water. I can't find anything that explains this on a molecular level :S

So my computer is just over 1 year old. I put it on sleep a lot rather than shutting it down (but I don't think this hurts the hard drive). Is there any reason for worry? According to HD Sentinel, the percent health is 88%. According to "Failure Trends in a Large Disk Drive Population", my hard...

Homework Statement Evaluate: \int\int \phi \nabla(\frac{1}{R}) - \frac{1}{R}\nabla\phi * \vec{n} dS a) over the surface of the ellipsoid 1/9\,{x}^{2}+1/16\,{y}^{2}+1/25\,{z}^{2}=1 > where \phi={x}^{2}+{y}^{2}-2\,{z}^{2}+4 Homework Equations The Attempt at a...

!Desperate!This Dynamics Problem is Killing ME! Homework Statement We have ben dealing with General Plane motion of a rigid body and this problem has been getting the best of me for some time now I know from the text that the answers are \omega_a=14 rad/s \omega_b=28.8 rad/s and...

and theoretical science: I have somebody I want to set straight about the difference between unproven theories: and proven hard science that is used daily. The answer coming from a real scientist or engineer will have more of an impact then coming from me. Can anyone here give a lucid...

!For The Love of GOD! Diff Eq Homework Statement I have done this problem 3 times. I am getting a sign error somewhere and I cannot find it. When I solve this DE and then plug it back into the original, it is not checking out! Can anybody see my error? I would really appreciate a second...

\frac{5x-5y-bx+by}{5x-5y+bx-by} i can't cancel anything i can't factor anything please help

hi, everyone. Do anyone here can suggest where, which book or website can learn more bout the theory behind the magnetic hard disk, and it current technology? i.e. spintronic...

This is my first post and while I have more degrees than a thermometer none af them have anything to do with this forum. However, I love cosmology and have a few questions from the untrained perspective. I have written and published that the obvious is often the most difficult to see. I have...

[SOLVED] Forces, Acceleration...Hard Stuff (HELP!) A trailer with loaded weight Fg is being pulled by a vehicle with a force P. The trailer is loaded such that its center of mass is located as shown. Neglect the force of rolling friction and let a represent the x component of the...

Alright guys here it is: My teacher asked us to think about a bonus question. He wants us to use torque to find the mass of the sliding mass on the center beam balance (the one that moves through 0,100,200...ect.) How do i do this?!

Problem with Work Done by Friction, Velocities--Extremely Hard Homework Statement Here is the known data: The track has to be 1500m max, less track can be used. There is a minimum of 3 hills (you decided how steep and how high they are). There are two turns (track makes one lap). The...

Some time ago I was wondering about disconnecting my alternator from my race car just during a quarter-mile drag run. The lesser friction on the motor's drive belt system would be ideal. Then I realized that spinning the alternator itself is not that much of a problem, it spins pretty freely...

Let's say I have a one-kilogram object, and I drop it from heights of 1 meter and 2 meters, respectively, ignoring air resistance/friction and so forth. Are the following statements true? The objects hit the ground with the same force since the mass and acceleration (due to gravity) do not...

Does anyone know of any programs/methods for this? I had a disk crap out on me over the weekend and there are some email I didn't have backed up that I would like to try and recover. I tried repairing it with chkdsk and the Windows Recovery Console to no avail. Thanks...CS

Problem Determine the differential and total cross sections for scattering from a "hard sphere" of radius R ("hard" means impenetrable). Relevant Formulae \sigma (\Omega) d \Omega = \frac{number \ of \ particles \ scattered \ into \ solid \ angle \ per \ unit \ time}{incident \ intensity}...

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Homework Statement Prove that Neither <xp>=∫ψ* x(ħ/i)(∂/∂x) ψ dx nor <xp>=∫ψ* x(ħ/i)(∂/∂x)xψ dx is acceptable because both lead to imaginary value.Show that <xp>=∫ψ* x(ħ/i)(∂/∂x) ψ dx + ∫ψ* x(ħ/i)(∂/∂x)xψ dx leads to real value.Does <xp>=<x><p> ? Homework Equations...

Consider triangle ABC,the continues charges distribution lies on the side of BC with the linear charge density such as m,prove that the direction of electric force in the point A lies on the bisector of the viewing angle BAC

someone pls help A worker bee is ready to fly out and gather pollen, but on her way out of the hive she meets a fellow bee worker who tells her there is a pollen source 0.3km southeast of the hive. however, before the outgoing bee leaves the hive, she meets another incoming bee and she tells...

Hard Motion Question- Help? I am really stuck on this motion question, can anyone help please?:confused: "A balloon is 30.00m above the ground and is rising vertically with a uniform speed when a coin is dropped from it. If the coin reaches the ground in 4.00 seconds, what is the speed of...