Bit Definition and 380 Threads

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 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

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 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...

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...

Homework Statement A house has well insulated walls. It contains a vol of 100m^3 of air at 300K a) calculate the E required to increase the T of the diatomic gas by 1.00C b) If this E could be used to lift an object of mass m through a height of 2.00m what is the mass of m? Homework...

Homework Statement You have Joe and John playing catch in space. Joe throws the ball to John with a velocity of 7.5 m/s. Given Variables Joe's mass is 60.9 kg John's mass is 79.8kg Ball's mass is 6.5kg Find: A) Joe's velocity after he throws the ball. B) John's velocity after he...

I graduated from high school about a year ago, during which time i had taken some college classes and had managed to get my A+ certification, along with 2 lvls of cisco certification. after that i got a decent job, but decided the field was not for me. so here i am now, trying to presue my child...

What I need is that when a certain key (on a keypad) is pressed it would output a corresponding binary number. I have completed this with an HC11 in assembly language. My professor says that the HC11 is over kill and that a micro pic would do this for little money. I am new to micro pics and...

Homework Statement Using basic gates and/or building blocks, design a logic circuit that takes in a 4 bit input and will compute the number of 1s in the input. Homework Equations The Attempt at a Solution I have no idea where to start can anyone help please.

this 600-page book is now available for pre-order at Amazon https://www.amazon.com/dp/3540714227/?tag=pfamazon01-20 It's not my perfect cup of tea, but I am glad it is coming out because it helps give substance to the research area of Quantum Cosmology and make the field more visible. The...

[SOLVED] Little bit of convex analysis on a Hilbert space Homework Statement Let H be a Hilbert space over R and f:H-->R a function that is bounded below, convex and lower semi continuous (i.e., f(x) \leq \liminf_{y\rightarrow x}f(y) for all x in H). (a) For all x in H and lambda>0, show that...

Work and Electrostatics - Help! Homework Statement I need to place equal and oppositve charges on a piano and at the top of a 5.0 meter ramp in order to move a 1000 kg box up a 30 degree frictionless ramp. The box has a charge of +Q and the top has a -Q. A) What magnitude charges do I...

I won't be around tomorrow night to enjoy the annual near-beer and Nyquil New Year's Eve countdown (I actually have real life friends to spend the evening with this year :biggrin:), so I thought I'd wish everyone a Happy New Year a bit early, and at least get the party started. Hopefully by...

Homework Statement f''(x) = SQRT(x) - 2 cos(x) What is f(x)? (all possible solutions) Homework Equations - The Attempt at a Solution Well here is what i got: f'(x) = (2/3)x^(3/2) - 2 sin(x) + C f(x) = (2/3)(2/5)x^(5/2) + 2 cos(x) + C + D thus final answer is: f(x) = (4/15)x^(5/2) + 2...

[SOLVED] Stretching things out a bit, I Can anyone help me with this problem? You have a spring with force constant 450 N/m. How much work do you do in (a) stretching the spring from its relaxed position to an extension of 10 cm. (b) stretching it an additional 10 cm. (c) allowing it to...

Missed some class notes due to being sick. Anyway have a tutorial question I need some help with as I missed out on the subject. For an 8 bit ADC, how many clock pulses are required for an exact mid-signed range. I think 4, appreciate if someone can advise. TIA

Shifting a double-wide variable -- bit twiddling I have a number too long to fit into the largest variable size (unsigned long long, 64 bits in this case) so I'm storing it in two variables, left and right. I want to shift it -- and to do it quickly, as I'll do this more than 1e12 times. The...

Does anyone know of a DIN-unit or something similar that works as a rs232toAnalogVoltage-converter thanks! /tj