Hard Definition and 1000 Threads

Hi everyone, For fun, I decided to check out some problems from a math competition designed for advanced high school students. I came across this problem that I can't seem to figure out. The contestants are suppose to be able to get it in 3 minutes (it's part of a 20 question test given in...

Summer has started and I know a lot of college students have already made their schedule for fall. Post them here! I'll start... Engineering Mechanics Thermal Science Nuclear System Dynamics/Control Numerical Methods and Fortran Nuclear Engineering Lab I'm also considering adding...

I am currently self-studying Apostol's Calculus, and I am able to grasp what he's teaching. I've also read a proof based books and feel comfortable with proofs. Will baby Rudin be too hard to self-study from? People say he is terse. People also say Apostol is dry, but I don't think it is so bad.

Would you say Mech is one of the harder engineers? Most of the prospecting Mech students I know are incredibly smart. I'm probably going to be an average student going into there. Is the competition for a job really tough in Mech for me then? How much drafting is in it? How much is it by...

There was a recent thread about community college, and the fact that many students who enroll aren't ready. A few people commented that those students are better off starting work in a menial job rather than going to college, then possibly entering the same menial job. Suppose that you're...

Homework Statement I really need to know what to do with this to solve it. dm/dt=-km(t) I was given the second step, dm/m=-k(t)dt, and wondered if someone could explain why you do that? I know that after that step you have to integrate. If anyone could explain logm=-kt+c? I don't know where...

Hi, i am running a hard disks molecular dynamics simulation. I would like to compare the radial distribution function obtained from my simulation with the theoretical radial distribution function. May i know what is the theoretical radial distribution function? Or what data do people normally...

Some time ago Halton Arp made a prediction that big red shifted galaxies are connected to smaller red shifted galaxies. Does anybody know what exactly was his prediction. Anyway so NASA and The Hubble Heritage Team tried to discredit him using this image: But look what happens when...

I have problem with prooving those two identities. Any help would be much appriciated! Show that: a) \begin{Bmatrix} m+n+1\\ m \end{Bmatrix} = \sum_{k=0}^{m} k \begin{Bmatrix} n+k\\k \end{Bmatrix} b) \sum_{k=0}^{n} \begin{pmatrix} n\\k \end{pmatrix}...

Homework Statement A very light rigid rod with a length of 0.516 m extends straight out from one end of a meter stick. The combination is suspended from a pivot at the upper end of the rod as shown in the following figure. The combination is then pulled out by a small angle and released. a)...

http://www.cmi.ac.in/admissions/sample-qp/ugmath2010.pdf It's a sample entrance exam at a university for their Mathematics and Computer Science course. Three year long, so I suppose one should think of the level of difficulty and breadth/depth of material as comparable to second year college...

Hard Riddle i guess! This is a tough one for me and i can't guess what is really the answer. Maybe one intellegent person here could do so. I am found on every playground. I am found in every office building I am long... but also short I am fat but sometimes skinny I make dogs bark...

I just took a first semester of a first year physics course for scientists and engineers. Even though I thought that course work was rather rigorous, I did well and got an A in the course. I'm thinking about going into biophysics, but need to have a GPA in the range of 4.0-3.9 since I plan to...

And what happens if one doesn't?

I have 2 P.C.s as follows P.C.1 : 865G/GVM3-V (MS -7101 V2.0) M-ATX MicroStar Motherboard Pentium 4 Dual Core Processor 80 GB WD Hard Disk 1.5 Gb/s 512 MB DDR1 RAM 250 Watt Power Supply Bought in 2006 P.C.2 : M2N68-AM SE2 ASUS Motherboard ATHALON...

I'm taking calculus for scientists and engineers and was wondering how much harder are upper division courses like partial differential equations, ordinary differential equations, and complex analysis than calculus?

Is it really so difficult to get a position as an assistant professor then crawl up the ranks? Is there anyone here who has done it and succeeded? Anyone who has tried and failed? Are there any statistics on the matter?

I'm researching neutron moderators and I want to model how many collisions are required for fast neutrons to be moderated to thermal temperatures and the distribution of energy absorbed by the moderator during the process. I have quickly worked out the %age velocity reduction for the simple head...

I will have a B.S. in Applied physics with a minor in Computation. Graduating in one week. I have been applying to jobs left and right and haven't gotten one call back. It has been very discouraging. I have been applying to Lockheed, Ball, Nasa, Northrop and Grumman... Besides the...

Homework Statement lim n->infinity (4^x + 7^x)^(1/x) Homework Equations Not applicable (?) The Attempt at a Solution Tried taking "plugging" infinity for n but I keep getting 1, is this right? Seems too easy to be just 1? Thank you.

Homework Statement the integral is x*tanh(sinh^-1(2gx/c))) Homework Equations n/a The Attempt at a Solution I cannot figure out how to integrate this! Even Maple can't do it :( Any help would be greatly appreciated! Thank you!

I took some practice online SAT questions yesterday. I thought the math ones were easy, or at least seem possible to grasp if one studies it. The English grammar correction part was extremely hard for me even though its one of my best subjects; most of the answers were subjective and really...

Homework Statement tanh{[(2 *g*t)/(c)]+[(2*g*exp(-rt))/(r*c)]-[(2*)/(r*c)]} in terms of t Homework Equations when I plug into maple I get -(1/4)*c*ln(tanh(2*g*(t+1/r(e^(-rt))-1/r)/c)-1)/g-(1/4)*c*ln(tanh(2*g*(t+1/r(e^(-rt))-1/r)/c)+1)/g The Attempt at a Solution This cannot be...

Do you guys ever get this tingly feeling in your brain after you spend a long time trying to figure out how to solve a problem (eg mathematical proof) and finally getting it?

\int \frac{\cos^2 x}{(1+\epsilon\cos x)^3}\,dx Where, \epsilon > 0 is a real number constant.

Hi, I'm just graduate high school and i'll be in college in the next 2 months, I choosed Mechatronics engineering, anyway, I've been thinking about enroll MIT at Master degree, i wonder that how hard do i have to work to made it. DO i have to spend my every single minute with the subject...

Homework Statement The spring in the figure has a spring constant of 1300 N/m . It is compressed 13.0cm , then launches a 200g block. The horizontal surface is frictionless, but the block's coefficient of kinetic friction on the incline is 0.180. What distance does the block sail through...

I know these kind of topics suck but I'd like some opinions on the schedule I'm planning next fall. I heard EM was hard and I was curious to see if that plus all the rest was a lot to handle. Especially as my first real EE semester Circuit analysis II Introduction to Digital Systems...

Homework Statement A computer hard drive disk with a diameter of 3.5 inches rotates at 7200 rpm. The “read head” is positioned exactly halfway from the axis of rotation to the outer edge of the disk. What is the tangential speed in m/s of a point on the disk under the read head...

HI, sorry about the english can you help me with this question? box initially contains 10 black balls and 10 white balls. The following experiment is repeated indefinitely 20 times : A ball is drawn from the box; if the ball is black it is put back in the box, otherwise it is left out. what...

Java problem ArrayList problem, **URGENT** hard question Introduction: You are part of a team working on a software system for a mobile phone company. The team is working on the development of the component that will be used for storing text messages. The initial design has a structure using...

I still have a long ways to go but it seems like many of the jobs require a master's degree. Due to some past mistakes, I may not be able to maintain my 3.0 that I currently have all the way through until graduation.

Homework Statement Figure 7-40 shows a cord attached to a cart that can slide along a frictionless horizontal rail aligned along an x axis. The left end of the cord is pulled over a pulley, of negligible mass and friction and at cord height h = 1.6 m, so the cart slides from x1 = 4.0 m to x2...

Problem: A 30-foot ladder rests vertically against a wall. A bug starts at the bottom of the ladder and climbs up at a rate of 3.5 feet per minute. At the same time, the foot of the ladder is being pulled along the ground at a rate of 1.5 feet per minute until the top of the ladder reaches the...

Now, I'm not going to ask anyone to do my assignments. I just want help understanding how to calculate tension so that I can complete my work by myself. I may give examples from my assignments, but I don't want anyone to just work it out and post answers - I want to understand. I'm new to...

Homework Statement f(t)= sin(t), so as expected the period goes from 0 to 2pi. But 2pi to 4 pi is function is ZERO, and then starts up again from 4pi to 6pi, then zero from 6pi to 8pi,etc So basically sin(t) that skips every other period. Homework Equations The Attempt at a...

Homework Statement A car is brought from 100 km/h to 0 km/h in 2 seconds. A student with a mass of 73kg(not wearing a seat belt) flies through the air toward the dashboard which is 0.650m away. He smashes into the dashboard and it takes 0.25 seconds to slow him to the velocity of the car at...

Hard Time Understanding "If A C B, then A U B = B" Homework Statement Understand how "If A \supseteq B, then A U B = B" is possible. Homework Equations None. The Attempt at a Solution Since A U B = B, it can be separated into two cases. That is, 1) A U B \subseteq B 2) B...

I have big problems solving this integration: \int_{-a}^{a}\sqrt{a^2-x^2}e^{i(kx-wt)}dx I did an substitution with: x=a*sin(u) Which gave me: \int_{-{pi}/2}^{{pi}/2}a^2cos^2(u)e^{i(kasin(u)-wt)}du But i don't know if that did it any better, cause i can't figure out how to go on from...

tension or is it to hard to work out with physics ? Hi there, I have posted somthing the same, however new evedence has come up. Some say the force thus tension on the muscles has the same average, let's just say for now the force thus tensions are the same. We are using say the bench press...

Statics...is this problem easy or hard? Yes, I know, easy and hard are relative statements, but I mean easy or hard compared to the other stuff I posted here-- if anyone remembers. Homework Statement A uniform beam, AB, whose length is 2 meters and mass is 10 kg is supported in its tip, A, by...

A mass moving with some initial speed hits a very very long NOT massless spring. Friction is ignored. Will all of the kinetic energy that the mass had become the springs potential energy? And when the spring itself would start to move? To me it smells like a nonelastic collision where all the...

Homework Statement A 360 nm thick oil film floats on the surface of the water. The indices of refraction of the oil and the water are 1.50 and 1.33, respectively. The surface of the oil is illuminated from above at normal incidence with white light. The two wavelengths of light in the 400 nm...

Homework Statement A 360 nm thick oil film floats on the surface of the water. The indices of refraction of the oil and the water are 1.50 and 1.33, respectively. The surface of the oil is illuminated from above at normal incidence with white light. The two wavelengths of light in the 400 nm...

Do most students find it more difficult than analysis and abstract algebra?

I'm having a hard time getting scholarships. As a senior in high school, I got one that is about $2,000 a year, but that is all that I've gotten. My parents make enough that I am not considered for the semi-need based ones, and I'm not outstanding enough that I can really get the super...

hard physics question! help please Homework Statement How do I solve the 2 questions below?: Questions 23 24 A 0.l kilogram block is attached to an initially unstretched spring of force constant k = 40 Newtons per meter as shown above. The block is released from rest at time t = 0. (the...

When choosing my classes, I've always picked the easier class rather than taking the harder just so I can get a higher grade. (For example, I took Calc III last semester rather than Honors Calc III). Do you guys think this is a bad idea? If I want to go to graduate school wouldn't picking the...

How hard is it to study astrophysics?? I am starting uni next year and I was thinking about astrophysics.. So can anyone tell me how hard is it (i know it's diferent from person to person but i was thinking you could take more objective approach to this matter) and do you have to be a "genius"...

I see a hard disk drive (Q:) in my Computer directory but I don't know what it is. I recently reinstalled Windows and everything is fine except for this. I can't access it, it doesn't appear in Disk Management (when I right-click my computer icon and click Manage). Here's a screenshot of what...