Urgent Definition and 367 Threads

I have recently bought a pc.I want to know about avira antivirus.can anyone tell me Is avira reliable? is not, Please give me some tips which antivirus I should use. This is Urgent please reply soon.

Homework Statement Problem:1→In FOLLOWING CIRCUIT CALCULATE VOLTAGE ACROSS 2Ω RESISTOR http://www.freeimagehosting.net/t/dvnne.jpg Problem:2→CALCULATE THEVENIN'S EQUIVALENT RESISTANCE ACROSS TERMINAL 'A'&'B' FOR FOLLOWING CIRCUIT http://www.freeimagehosting.net/t/6zuj4.jpg This is...

Okay. So i am planning to make this project in which i want to use two transmitters and two receivers. I want to make one of them to transmit waves that go only for say 3+ feet and another than can only transmit around 1 feet. 4 Is it possible? I know frequency plays an role and so...

I need to print the int i right next to the main, but I need to do it while I am in the if portion of the following code: int i = 7; int main() { int i = 5; cout << ::i; if(1) { int i =9; cout << ::i<<endl; } return 0; } Right now it prints 7. I need it to print 5...

I have laser drilled hole thin ceramic specimens and I am required to measure the diameter of the holes. Suggest me some methods.

Dear friends I have a problem in creating a block tridiagonal matrix. I try to create a block tridiagonal matrix in MATLAB and I tried everything but it is not working for me. I have matrices A, B, C of dimension 4*4. Elements od these matrices are dependent on (n) and in each n has different...

Sorry for other problem but very important for my lesson. http://a1112.hizliresim.com/s/7/yv46.jpg

Homework Statement x<1 Homework Equations ∬_(z<1)▒z*dx*dy/〖(1-z^**x)〗^2 The Attempt at a Solution

The Image has all the details: http://img38.imageshack.us/img38/3448/question3p.jpg Uploaded with ImageShack.us I honestly I have no Idea as to where I should begin. Any hints on how to get started?

(I will try to correctly translate this, as this is a class in french) A person on the board of a swimming pool throws a ball (ball1) at a speed of 8 m / s at an angle of 40 degrees above the horizontal. At the time of launch, the ball is 3 m above the water, and 10 m from the opposite side of...

Hello, I have an urgent question due soon, and I have no idea how to solve it.

Homework Statement I'm new to matrix mechanics in quantum mechanics and I admit that linear algebra is the weakest part of my maths toolkit but I have an operator to convert to matrix form. I'm about 85% sure I've done it right, however I can't solve for the eigenvectors. I'm sure I'm...

Urgent! Absolute value help Homework Statement Heres an example :: |5x-3| = |x+1| we were given 3 cases for this type of problem in class they went something like this:: c.1 ) Use the 0 value for the right side and change all values in respect to (introduce - to all values) (x <...

Homework Statement a particle moves to the right along the x-axis with a simple harmonic motion from x0 = 3.0cm in t=0 . if its position x is given by x = 4.0 cos (pi t + phi) , in cms ; find its period T. Homework Equations The Attempt at a Solution The problem ask me more...

For the most part I've been using the Hubble constant of: H0 = 72 km/s/Mpc but I've started seeing it expressed as: H0 = 100 h100 km/s/Mpc. what is h100 and why is it coming up in this?? I've also seen the critical density for the shape of the universe (flat/open/closed ect) as: Rhoc = 1.879...

Homework Statement A 10 Ohm resistor is held at a temp of 300K. A current of 5A is passed through the resistor for 2 mins. Ignoring changes in the source of current, what is the change of entropy in: (a) the resistor (b) the universe Homework Equations The Attempt at a Solution...

Hi, I am simulating vibrations in simulink and processing my results in matlab. I am trying plot the PSD for my acceleration results using pwlech method. When I plot the PSD plots from the methods below (NOTE:I have a sampling rate of 0.006 so that means I am using a sample frequency of...

Urgent! Thermodynamic refrigerator Homework Statement One mole of a monatomic ideal gas is allowed to expand isothermally from an initial volume of 10 liters to a final volume of 15 liters, the temperature being maintained at 400K. The work delivered is used to drive a thermodynamic...

As I needn't use graphic calculator at school, I'm still not very familiar with my newly bought algebra fx2.0 plus:-( and I'm now having troubles. :-( Can this calculator find area between curves? also, can it find area bounced by a polar curve? I can only find area under curve by...

Homework Statement A man floating in water was spotted by fishermen on a boat. Before taking him on board, the man was put on a fish scale to see how much he weighed. The reading on the scale oscillated between 72kg and 178kg. The wave speed was measured to be 16 m/s. The wave height was 3 m...

Urgent! Mechanical Properties at high temperature At first, My cordial respect to all members. I need help regarding my research study. I read a paper by Yaguchi, M., T. Ogata, and T. Sakai, Creep strength of high chromium steels welded parts under multiaxial stress conditions...

Homework Statement \int_{0}^{1} \int_{0}^{1} (xy) dx dy = [\int_{0}^{1} (x) dx] [\int_{0}^{1} (y) dy] Its use to prove the convolution formula.. Homework Equations The Attempt at a Solution

Urgent! Acceleration of an ice block given mass Homework Statement A 42 kg block of ice slides down a slope of 30 degrees. Assuming friction is negligible, what is the acceleration of the block down the incline? Homework Equations Fnet=max W=mg The Attempt at a Solution I have...

In a test that was held many weeks ago.. We were asked whether concentration will affect the strength. The answer given by the teacher is yes.. As based on the concept of pOH... But i strongly disagree and i had a debate with my lecturer. . I said it should be based on Kb or percentage...

Ladder Problem (urgent) A light of negligible mass and length d is supported on a rough floor and leans against a smooth vertical wall makeing an angle (theta) with the floor. The coefficent of friction between the ladder and floor is M. If a painter climbs the ladder up distance x, what...

Urgent! About Impedance the total ohm of this impedance ( 30+j40 ) is 50ohm. but wat is the conjugate impedance ?? 30-j40? total ohm is wat? 30+j40 is 50ohm solution is square root of (302+402)

BBC 2, 9pm, Horizon: What is reality? GET WATCHING!

Homework Statement Use a double integral to find the area of the region D, where D={(x,y) contained in R2 | 4x2+12xy+13y2+40y<=-75} Hint: complete the square I have a hard time getting the region, i should complete the square to get a formula in R2 that describes the region, i tried to...

[Urgent] Surface area Homework Statement Hi there, sorry for the hurry, I had a big problem this weekend and I couldn't study. I have my exam tomorrow, and need help with this. I'm finishing with the topic, and I have almost studied all what I had to study, but this exercise resulted...

Homework Statement A searchlight is rotating from a point 'P' positioned 50m from the prison walls. The rotation of the light is represented by the equation d = 50sec2pi(t), where d is the distance in meters, from the light to the wall, and 't' is time in minutes. a) graph the the path...

Show the following: If A and B are n x n matrices such that A - B is singular then A2 - AB + BA - B2 is also singular. I really have no clue how to solve this, but I am guessing that AB does not equal BA, I don't know how that can help or be relevant but just in case Thanks alot...

Homework Statement A linear equation in form: dy/dx + P(x)y = 0 is said to be homogeneous since Q(x)=0. a) show that y=0 is a trivial solution (wasn't even taught what a trivial solution is) b) show that y=y[SIZE="2"]1(x) is a solution and k is a constant, then y=ky[SIZE="2"]1x is also...

Homework Statement Please find the attachment for vectors. If I know \alpha, \beta & \theta (colored angles) how can I find the angle between vectors C and D in terms of \alpha, \beta & \theta ? Homework Equations Cross product & dot product The Attempt at a Solution

Homework Statement Suppose we have the following forces: F1=[5i]kN F2=[-4j]kN F3= unknown force 30 degrees from + y-axis. How do you determine the magnitude of F3 such that the resultant FR for all three forces is a minimum? Thanks in advance.

Hi, I place an object on a rough surface. It is clear that the static friction will increase as you increase the elevation of the surface since there is a bigger component of weight acting down the plane surface. But will the max static friction -i.e. friction at the verge of slipping...

Homework Statement Hi guys, I was working on some few Trigonometric questions and since my book doesn't have an answer sheet, I thought it would be a good idea to scan it and then upload so I someone could review my answers and tell me where I went wrong. There are 14 questions but I left...

hello all Im trying to solve the equation: i*dV/dt = d^2V/dz^2 + V*sqrt(1-V^2) I want to try by the split step Fourier method. My problem is that most of the code/solvers I saw that implement the SSFM method are when the evolution is in space not in time, meaning the first derivative is d/dz...

Hello everyone, Am having a research about the use of fiber optics in illuminating a room for example by taking solar power. What are the formulas that are used in order to know how much length do we need and how many fibers we need in order to have for example the power of a 60 watt lamp...

So essentially, I have not come to a decision in spite that today, May 1st, I must inform the colleges that accepted me where I am going to study for the next four years. My choices are: MIT, Harvard, Yale and Princeton. I am at my wit's end; here is the gist of it: a) I want to study...

Help me to solve this equation....Urgent Hi Friends Can anyone tell me the solution of this equation exp(-4Ax){D^4-8AD^3+16(A^2)D^2}+i/(constant)=0 where i is complex no. A is a constant D indicates dy/dx or y'(x) Please Reply ASAP Thanks in Advance vinodjoshi

Hi guys, So I have gotten my assignment for my DE class and fortunately for me, someone had already posted up the questions on the net. Here it is: http://www.cengage.com/math/book_con...e/Project3.pdf I have posted this in the DE section, which i think is the wrong section to post in...

Random Sampe of size n from distribution with pdf f(x;p)={(lnp)^x}/px! for x=0,1,...; p>1 and 0 otherwise Find CRLB for p? My problem is finding E[x] which is somekind of maclaurin series but can't figure out which one? Please any suggestions? Thanks

Homework Statement If the rotation of a planet of radius 5.99x10^6 m and free-fall acceleration 7.87 m/s^2 increased to the point that the centripetal acceleration was equal to the gravitational acceleration at the equator, what would be the tangential speed of a person standing at the...

Sorry about the somewhat extreme thread but I'm sort of desperate. I missed nearly the whole rotation unit cause of illness and I need to find the MOI for a lab that's due tomorrow. I'm confused about what to plug in where. The lab goal is to find the MOI of a rod of uniform density swinging...

Homework Statement A cylindrical copper rod and an iron rod with exactly the same dimensions are welded together end to end. The outside end of the copper rod is held at 130 C, and the outside end of the iron rod is held at 0 C What is the temperature at the midpoint where the rods are joined...

Homework Statement 1. an object is thrown vertically up from a window that is 3.6m above the ground. Its initial speed is 2.8m/s. Homework Equations N/a The Attempt at a Solution Is the time the object takes to ascend equal to the amount of time it takes to descend?

Can't figure this out! Urgent Homework Statement http://img222.imageshack.us/img222/2470/63809024.png Homework Equations No Idea... The Attempt at a Solution If anyone can solve this then i will be very grateful!

I am confused in a thing that is on wikipedia and need to know ur answers on this.This is from the last part of derivation for comton shift. From the RHS, you take the square of hf so it becomes h^2 f^2 + h^2f ' ^2 +2h^2ff 'cos theta now how can it take the common from the below...

If you increase the area of the parachute what would happen? (select all that apply) A. parachute will descend slower B. parachute will move upward C. parachute's drag force will increase D. Nothing changes On the windy day, why is it difficult to ride a bike? (select all that apply)...

Homework Statement An observer in frame S standing at the origin observes two flashes of coloredlight separated spatially by delta x=2400 m. A blue flash occurs first, followed by a red flash 5 microseconds later. An observer in S' moving along x-axis at speed v relative to S also observes the...