Bit Definition and 398 Threads

i can't understand the transistor completely i can understand how it works but this stupid conventional current is confusing me completely please can anyone give a lengthy explanation on working of transistor CE CB CC types. i don't understand all these types of transistor i.e how current...

Hello there, I've been here before to ask for help with my fears about the LHC a while ago. Suffice to say I eventually overcame them thanks to the help from some members of this forum and that of Michaelangelo Mangano of CERN. However recently I've decided to revisit the old LHC Defense forums...

Towers of hanoi induction-- slight bit i don't understand Homework Statement I am trying to prove towers of hanoi. Now I am on the induction part and there is a part I don't get. I have the whole thing, but i don't understand a couple lines.Homework Equations The Attempt at a Solution WTS...

For first order linear differential equations when is it alright to use the dy/y-b/a = -adt form and when you must use the integration factor technique? In general i was able to obtain a solution using both methods. Also, how do i draw a direction field which contains both t and y variables...

This is so wrong! And just a little bit funny! http://www.msnbc.msn.com/id/32581670/ns/today-today_pets_and_animals/displaymode/1247/?beginSlide=1" I have to admit, I did chuckle at some of these pix :redface:. Poor, poor doggies.

So my mother mentioned to a co-worker, who is a "math guy," that I was interested in math. The co-worker subsequently gave her a piece of paper with the following written on it to give me to to "solve" or "prove" in my mother's words, yet I am unsure what to do. Here is what was on the paper...

Homework Statement Solve the differential equation R\frac{dq}{dt} + \frac{q}{C} = v_0 R is resistance, q is charge, t is time, C is capacitance, and v_0 is the EMF of the power supply.Homework Equations First-order linear differential equation solving method The Attempt at a Solution This is a...

So here i am, trying to understand a lossless transmission line that has open-circuit termination. So i start with the generic Zi, the equivalent impedance seen by the source, then allow the load impedance (Zl) to approach infinity. As you can see, i have no idea how to do it. It's been way to...

My high school career, there's a bit of a problem... Well, I am learning a bunch of math outside of school, but I don't really fall into the category of a person that likes math. I look like a skater kid. I'm sure you're going to say something like "looks don't matter" or whatever, but people...

I thought i had made my career decision, after transfering engineering school and going from a Computer Engineering program to an Electrical Engineering program. I thought EE was right for me and i enjoyed my first Circuit Class though i didn't do to well the first time. I haven't taken any...

So, i was thinking about this and figured out this: depending on electron orbit and, corespondingly, speed around the nuclei and energy of the photon, if the electron makes full cycle by the time it re-emits that photon the material is reflective - electron is in the same position where it...

We are so far at the end of school semester , and our first physics teacher have been changed , bringing a new teacher having a different kind in teaching and a different way in solving problems. I used to get on physics 97 over 100 , NOW, I got 70/100. What I'm trying to say is that I...

Find the area of the given function, rotated about the y axis The Area below the line y=2 and above y=sin(x) from 0-\pi I did this rotated around the X AXIS no problem, I found the area of the disk to be \pi(4-sin^{2}(x)) The volume around the X AXIS to...

Hello there, I joined in pondering a pretty weird question. You see the Space Shuttle being given a "Piggy Back" on NASA's B747-200. But what if someone was to strap a completley standard, non modified 1988 Vauxhall Astra onto the top of a Boeing 747- 400, Take off to a crusing altitude of...

Homework Statement 2iz^2 - (3-8i)z -6 + 7i Homework Equations z = \frac{-b +/- \sqrt{b^2 - 4ac}}{2a} The Attempt at a Solution Right, here goes... a = 2i b = -3 + 8i (is this correct? Or would it be better to leave it as 3-8i?) c = (-6 + 7i) so using these: z =...

how to proof if the solution set of a second order diffential equation af''+bf'+cf=0 is a real vector space w.r.t. the usual opeations?

Homework Statement The variance of an observable Qhat in a state with wavefunction psi is, (delta Qhat)2=<(Qhat-<Qhat>)2> Show that this can be written as, (delta Qhat)2=<Qhat2>-<Qhat>2 Homework Equations As above. The Attempt at a Solution (delta...

Hi! To start off I am an archer. I'm currently a freshmen working towards my degree but have not yet made it to physics. The issue is that I need to create a calculator that I can use to find the speed of an arrow being shot from a bow when I have X (the weight behind the string) and Y (the...

Design a 2 bit multiplier circuit. The design should include: a)truth table b)simplified logic expression c)logic circuit d)implementation of the circuit using NAND gates only. *Anybody able to help me? Actually that is my quiz on last week, but my lecturer note dint mention about this...

Homework Statement Two forces, F1 and F2, act at a point. F1 has a magnitude of 8.60 N and is directed at an angle of 63.0 (DEGREES) above the negative x-axis in the second quadrant. F2 has a magnitude of 6.00 N and is directed at an angle of 53.2 (DEGREES) below the negative x-axis in the...

Homework Statement An electric drill bit starts from rest and rotates with a constant angular acceleration. After the drill has rotated through a certain angle, the magnitude of the centripetal acceleration is twice the magnitude of the tangential acceleration. What is the angle? Homework...

Homework Statement A 16 KB memory has a 16 bit wordsize. How many 16 bit words total can be stored in this memory? Homework Equations None given The Attempt at a Solution I tried many things. My answer were 2e12, 2e13, and 2e14. All of these were wrong. Please help soon (if you...

Homework Statement A raindrop falls from rest through mist. Its velocity vms−1 vertically downward, at time t seconds after it starts to fall is modeled by the differential equation (1+t)\frac{dv}{dt} + 3v = (1+t)g-6 Solve the differential equation to show that...

Hi, I have used Compaq Visual Fortran 6.5 for years. Recently bought a new PC with Intel Core2 Quad Q6600 processor and Windows Vista 64 bit Home Premium OS (yes, likely a mistake on the OS). I wish to use Code I wrote in the past and take advantage of 64bit processor, memory, etc. I...

I need some help how to build 8 bit up/down counter for my tracking ADC. All ideas are welcome.

Drill problem, linear speed of drill bit help please [b]1. For a 12.7mm diameter drill bit turning at a constant 1250 rev/min find a) the maximum linear speed of any part of the bit; b) the maximum radial acceleration of any part of the bit [b]2. i switched the revs per minutes into...

Hi, I am not the greatest at math but I found an interesting probability question for you guys to think through. It has to do with the popular peer-to-peer program called BitTorrent, which people use to share files on the internet, typically ranging in file size from 5MB for a single song, to...

The axis of a disk with radius of 0.05m is fitted into a slot that forms an angle of 30degs with the vertical axis. The disk is at rest when it is placed in contact with a convayor belt moving at contsant speed. The coefficent of kenetic friction between the disk and the belt is 0.2 and there is...

Does anyone know how the diamonds in a diamond drill bit are attached to the drill? I tried google but didn't find much help regarding this question. I did find a picture of a diamond tipped drill: http://www.diamond-drill-bit-and-tool.com/Diamond-Drill/MAIN.htm But no explanation of how...

Homework Statement A 1kHz analogue signal is to be encoded using 8-level Pulse Code Modulator. This specification results in a bit rate of 5.5K bits/sec. The signal is to be transmitted over a 1 km distance with a 10kHz bandwidth on a Frequency Modulated, F.M., Carrier. The carrier frequency...

Homework Statement arccos(cos2\Pi) The Attempt at a Solution cos of 2\Pi =1 how do I get the arccos of 1? Without a calculator. Thanks

Homework Statement I am having trouble understanding the bit error probability equation. I need to determine the bit error probability for a coursework. I am given a noise sample and asked to determine the SNR and bit error probability for a signal voltage of 0.5 V. The noise is given as an...

I'm trying to relearn some trig for a math placement test to put me into a calculus class and am having trouble with one particular problem. One of the example problems is as follows: Find cos^2(2x)+sin^2(2x) I know the trig identity cos^2(x)+sin^2(x)=1 but I don't know how to apply this...

Physicists have anxiously devised one philosophical interpretation of quantum mechanics after another. http://pawst.com/post/586113-new-scientist-in-the-beginning-was-the-bit" with a macroscopic apparatus in the laboratory, which eliminates all possibilities but one.

Homework Statement Using the normal distribution for different modulation techniques over rayleigh fading , we have to derive SNR values for different Diversity techniques such as selection combining, Equal Gain Combining and Maximal Ratio Combining. Now for Non-coherent BPSK I have to...

Homework Statement A 4-bit arithmetic and logic unit (ALU) is to be designed for a 4-bit microprocessor. The ALU has two 4-bit wide inputs, labelled ii and i2 and a 4-bit output labelled out. In addition there is a carry-out bit. Design the ALU so that it implements the following functions...

I seem to have a destructive cycle of wanting to do one thing one day (like physics) and something different the next (like math or computer science). I'm really anxious right now and I have a feeling of impending doom unless I can smarten the hell up. I'm not sure what's going on because I...

confused... just a little bit though... difference between (x,y), and <x,y> the first one is a scalor, and the second one is a vector, but how...i'm not even sure how to say it...the second one with the <> what does the number mean if they're not coordinates? thanks

Homework Statement A pickup truck with a steel bed is carrying a steel file cabinet. If the truck's speed is 27 m/s, what is the shortest distance (m) in which it can stop without the file cabinet sliding? (Use µs = 0.8 for the coefficient of static friction of steel on steel.) Homework...

16 bit 2's complement adder. Due tomorrow! You are given two adders. Each adder has two 8-bit operand inputs and a 1-bit carry input. Each adder calculates the sum of the two 8-bit 2's complement operands and the 1-bit carry and outputs an 8-bit sum and a 1-bit 2's complement overflow bit...

Is it possible to construct 2 devices which simultaneously generate (the same) random bits indefinitely? No matter how far apart spatially they are. And I don't mean a pseudorandom number generator with the same seed. I mean something like sharing entangled particles, but without the need to...

Hello, I am trying to figure out how many effective bits of color depth are carried in the red channel of a number of averaged pixels. For instance, a single 24 bit pixel carries 8 bits per color channel (RGB). Therefore, you can generate 2^8 = 256 red levels, 2^8 = 256 green levels...

"Define a * b, for a,b \in R by a * b = ab+a+b. What we just have done is defined a new operation *, in terms of the well known ones multiplication and addition." Is there a real number which is the identity under the operation * ? Lets call this number e. A number for which a * e = e * a...

Ok, I have been to these forums a lot in the past year or so and I have learned a lot and asked a lot. But recently my past year has just been a drag - it is my first year in university and I know that some or maybe even majority will say it is only first year. But I don't think it is that, I...

Integration Issues...a bit urgent Hey having problems with five of my assignment questions, any help would be appreciated. Homework Statement (problems attached) Homework Equations The Attempt at a Solution For the first one, I tried to solve it by using the sin-1 x as 'u'...

Homework Statement folks, I have a small problem understanding a function as to what its doing: I have run this program in C++. I will comment the lines of code as per my understanding. Your insight would be useful unsigned int myfunc(unsigned int n) { // for n here I took 1200...

It's seems to be the accepted thing that global warming is bad, but is it such a bad thing? The dinosaurs certaintly preferred a more warmer climate. Look at the facts:- 1. The ice caps are melting - so what? What we lose on the south pole we gain on the north pole, we might lose a...

Homework Statement Find a recurrence relation for the number of bit strings of length n that contain three consecutive 0s. The Attempt at a Solution Divide the bit strings into two condition: one that have three consecutive 0s, another that does not. Let x_i denote the bit strings of...

Long time lurker, first time poster. I'd like to preface this by saying that I've spent many an hour glued to my monitor due to the very thoughtful and often eloquent posts on this forum. I am an undergraduate physics major who until recently was an economics major. This semester I began...

cr and lr circuits help.. exam in a bit and I'm stuck! okay so here's my question : how is the peak voltage across the resistance (in a cr circuit) or the induction (in an rl circuit) = \pmV_{m}/(1-e^{-T/2\tau}) V_{m} is the max voltage of the pulse train. the m denotes max both...