Urgent Definition and 367 Threads

This is not a HW but someone said in a previous thread that it sounds like it so I will post it here because it fits the format I guess. Homework Statement I have a flat plat that is x by y. It has an unknown number of holes in it but I do know the diameter of the holes is D. I also...

Homework Statement I have searched very long time. I need the kinetic coefficient of Polystyrene of Polystyrene, or even better Polystyrene on Glass. The polystyrene we are using is the stuff that is used to insulate hot water pipe. Homework Equations We do not know the weight of the...

COP of a Refrigerant...Urgent Please Help! How do you find the COP ( Coefficient of Performance ) of a Refrigerant if you know the basic details of the refrigerant such as: Critical tempertaure Critical Pressure w Cp Also I am trying to calculate the VCC as well!? Any advice would be...

Homework Statement Solve for x. x is greater than or equal to 0 and x is less than or equal to 2pi. (4/3)sinxcosx-sin22x=0 If there is a better way to approach this question than the way I did it below, please post it. Thanks.Homework Equations N/A The Attempt at a Solution...

Urgent Help Needed- Finding the speed at the centre of mass? Please help me :( Hi, I was attempting to work through this question. Anyways, I was working from a graph, so the radius 2.5 cm, the two of them collided, it was an inelastic collision as the two objects did part ways, so how do I...

Urgent Help Needed- Finding the speed at the centre of mass? Please help me :( Hi, I was attempting to work through this question. Anyways, I was working from a graph, so the radius 2.5 cm, the two of them collided, it was an inelastic collision as the two objects did part ways, so how do I...

Mechanics Question : Maximum Load needed ?? Urgent Please Help Homework Statement http://img694.imageshack.us/img694/5462/66814773.jpg A new steel bracket was designed to support various loads being hung from the end. The designer would like to know the largest load that can be hung on...

Homework Statement In using the experiment where a scintillator is connected up to PMTs, and the data is then recorded on the computer... The muon has already lived outside the scintillator for a large amount of time before it decays in the scintillator, so how is it that the experiment...

Urgent First-Year Calculus Word Problem! Help needed ASAP! Homework Statement Hey this is a first year calculus word problem: A third design question involves our plan to provide interested tourists with a video of themselves on our biggest Ferris wheel. The idea is to place a camera on...

Homework Statement The drag coefficient works like the coefficient of friction when an object is moving through the air, but it increases its effects as the object moves faster. A skydiver plus the parachute has a combined mass of 94.0kg. if the formula for the drag coefficient of the...

Dynamics Problem..Grade 11 Urgent Help Needed! Homework Statement Paul and Mintu are attempting to push a heavy fridge across the kitchen floor. When Paul pushes it with a muscular force of 550N, the fridge accelerates from rest to 28.0cm/s in 3.5s. When Pintu pushes it with a muscular...

Homework Statement The position of a particle on the x-axis is given by x = 2t^2, due to an applied force of F = e^(2t) parallel to the x axis. a. Write an expression for the power supplied by this force as a function of time. b. Compute the instantaneous power when the particle is at x =...

Here is the question: Predict the products formed at the anode and at the cathode when NaBr(aq) is electrolysed using inert electrodes Answer: Somehow i got 2 different answers by different answer sheets One of them stated that Br2 gas (anode) and H2 gas (cathode) would be liberated...

Urgent help on static force at the top of an incline DUE TOMORROW Homework Statement A 5.0 kg block on an inclined plane (angle 37 degrees) is acted on by a horizontal force F with magnitude 50 N. The coefficient of kinetic friction between block and plane is 0.30. The coefficient of static...

For reasons of a personal nature, it's important to me that this code get cracked as soon as possible. I spent a long time on this but I simply can't get - cryptography has never been my strong point. I'd appreciate any help! Thanks so much in advance! 53Xb48ECR1602YL

Matlab: Urgent! My comp crashed and now I can't open my file anymore... it gives me this error message: http://i31.photobucket.com/albums/c374/haoming/matlab2938293.jpg Please help!

Homework Statement The quantity Z is a function of 2 variables A and B. Z=A^4/B A=1.253 (error0.005) B=20.7 (error 0.2) Calculate percentage error in Z.Homework Equations I have the relevant error expressions if Z=A/B (errorZ/Z)^2 = (errorA/A)^2 + (errorB/B)^2 if Z=A^n errorZ/Z=n.errorA/A...

Urgent help with physics incline problem! A block of mass m is on an inclined ramp. The coefficient of static friction between the block and the ramp is µs. There is also a wall on the ramp situated below the block (see diagram). http://img15.imageshack.us/img15/6056/image13pj.jpg a)...

urgent EMM question Homework Statement find the vector potential a distance s from an infinite straight wire carrying current I, check that dell dot A=0 and dellxA=B... ok i know the answer is A=A(s) z, in cylindricals. A(s)=(mu*I/2*pi)ln(s/a)z when a is a constant. can someone please...

I've looked all over the internet, and can't find a decent explanation. Could someone please explain why the stefan-boltzmann radiation law of I = oT^4 be explained in classical mechanics rather then quantum? It's urgent, sorry to be pushy. Cheers.

Waves and Sound Vibrations Question Urgent Please Help?? Homework Statement A mass suspended from the end of a spring vibrates up and down 25 times in 50s. What ar ethe frequency and period of the vibration. Homework Equations F = 1/T T = 2(pie)3.14(squrroot)L/g The Attempt at a...

Urgent!Isothermal process Hi guys. i have a very short question. In an isothermal process, change is temperature is zero, so change in internal energy is zero, thus Q=W. The part that i am confused is that if Q=mc(deltaT) then should be a change in temperature in the isothermal process? Thanks...

Urgent...Communication Question Homework Statement A 1kHz sinusoidal frequency modulates a carrier at 146.52MHz with a peak deviation of 5kHz.Evaluate the exact magnitude spectra of FM signal if Ec=1. Sketch your result. Using carson's rule, evaluate the approximate bandwidth of the FM...

Homework Statement A car that is accelerating uniformly travels 18 m in the fifth second of its motion. Calculate acceleration. I've tried to answer this a million different ways. If it's in the fifth second on motion that means it has traveled for four seconds, yes? And I'm not sure...

Hello ladies and gentleman. I need help ONLY because...my project is due tomorrow. BUT dear sirs and siresses, do not fret. I only need some help in some areas (let us hope). My project is entitled When the World will End. I wanted to make a somewhat, vague creative project, so I chose this...

can someone pls tell me how you can get the value of 'a' or the gradient in a quadratic equation by analysing the quadratic graph as a reminder the equation is y=ax^{}2+ bx + c

Homework Statement http://www.strings.ph.qmul.ac.uk/~russo/QP/r06QPHYEX.pdf Question 3. The Attempt at a Solution I can easily derive the equation I need, which is: lamda = h/p Which after some playing around with K.E =1/2mv^2 etc we obtain: lambda (de brogile) = h/SQRT(2mKE)...

1. Integrate on the interval [0, 1]: (x2 - 1)/(x2 + 1) 2. No relevant equations. 3. S x2/(x2 + 1) - [S 1/(x2 + 1)] = S (x2 + 1) - 1/(x2 + 1) - [(arctan x)] = S -1 - [(arctan x)] = -x - arctan x I can plug in the numbers on my own, but I would like to know if what I've done...

I've been having trouble understanding why my answers are always different to the solutions and I found that there's two equations: {-b ± SQRT(b^2 - 4ac)}/2a and {-b ± SQRT(b^2 -ac)}/2a I don't know when to use either equation, always having used the first, and for someone at my level to...

The problem is as follows: Decide if the following pairs of orbitals overlap to form a σ bond, π bond, or no bond at all. Explain your reasoning in each case, including a sketch of the orbitals. Assume the bond lies along the z-axis. (a) 2pz and 2pz (b) 2py and 2px (c) sp3 and 2pz (d)...

Urgent calculation: design a construction lift... the construction lift is used in a building construction project. the construction will raise building materials from ground level to any height up to 12.2m. The life will be at the top of a rigid scaffold that is not a part of the design...

Hi I am really stuck on the following and have an exam on it in 2 days. Can somebody please help me. A particle of mass m collides elastically at an angle of 90 degrees with a lighter particle of mass km. Initially both particles had a speed u. After the collision the particles move apart...

Hi I am really stuck on the following and have an exam on it in 2 days. Can somebody please help me. I have attempted it but think I have done it all wrong. (I have indicated how many marks each part of the question is worth at the side). a. A particle of mass m moves at constant velocity v...

The images tell it all. Please help someone. http://image.cramster.com/answer-board/image/200941884006337564080009162509346.jpg on this diagram, the expression IL(t) should read I(t). http://image.cramster.com/answer-board/image/2009418845296337564112974787505740.jpg

Homework Statement Prove that if X[n]->L, X[n] doesn't equal 0 for all n, L doesn't equal 0 and Y[n]->M, then (Y[n]/X[n])->(M/L). Homework Equations They only give you the squeeze theroem and that if X[n] converges then it's limit is unique. O and the definition. A sequence of reals has...

Urgent help need ! Bubble sort ! hi all, I was asked to built a C programme using bubble sort. here is the Question. TASK A PCB manufacturing company requires a software program to convert a series of a table of drill data to minimise the movement of the drill bed to speed up production...

Hihi, Let's say I have the linear equations ,A 2x +3y +4z 5x+6y-7z 5x-4y+3z then I can always write as a matrix multiplication A= B*x matrix B = 2 3 4 5 6 -7 5 -4 3 times matrix x x y z Then., how can I tell MATLAB to express in the matrix multiplication form so...

Magnetic Field Problem! Urgent! HELP! PLEASE! MAGE IS ATTACHED! COPY URL into address bar.. harmonphys.info/magnetism%20problems.doc The magnitude of the magnetic field in teslas at a distance d from a long straight wire carrying a current I is given by the relation B = 2 X 10 7 I/d. The two...

A force of 8.4 N holds an ideal spring with a 31.9 N/m spring constant in compression. How much potential energy is stored in the spring? I would think it would be PE =mgh to get m you divide the force/g but now I am not sure what to do after that. Any help would be great!

Homework Statement In a shipping company distribution center, an open cart of mass 51.0kg is rolling to the left at a speed of 5.50m/s (see the figure). You can ignore friction between the cart and the floor. A 10.0kg package slides down a chute that is inclined at 37degrees from the...

Poisson's Ratio coursework - Urgent help needed! hello, I'm currently working on a coursework for my A2 physics on Poisson's ratio i'm finding the ratio for aluminuim using aluminuim foil and strain gauges, adding masses to a clamp on the end of the foil (so foil is under tension) and...

Homework Statement The coordinates of a the vertices of a triangle are given: A(x1,y1,z1) B(x2,y2,z2) C(x3,y3,z3) and the sides opposite each vertex are a,b,c respectively. Find the coordinates of the incentre. The Attempt at a Solution I have been frequently using the formula...

1. Homework Statement We usually ignore the kinetic energy of the moving coils of a spring, but let's try to get a reasonable approximation to this. Consider a spring of mass M, equilibrium length L0, and spring constant k. The work done to stretch or compress the spring by a distance L is...

Homework Statement A 2kg block and an 8kg block are both attached to an ideal spring for which k=200 N/m and both are initially at rest on a horizontal frictionless surface. In an initial experiment a 0.1kg ball of clay is thrown at the 2kg block. The clay is moving horizontally with speed v...

Please Help ...Urgent ! Don't know how to solve 1. Homework Statement [/b] 3 concentric spherical shells r = 1, r = 2, and r = 3m and have charge distributions 2micro C/m^2, -4microC/m^2, and 5 microC/m^2. Calculate the flux through r = 1.5m and r = 2.5m How to Do? please help...don't know...

Homework Statement Find an equation of the tangent line to the curve y=2x-x^2 at the point (2, -4). Homework Equations y=2x-x^2 The Attempt at a Solution I do not have any idea how to do any derivative, other than the equation to do so. Please note that we have been given the...

Urgent ! Center of mass and relevant stuffs Homework Statement A vertical spring of constant k is attached at the bottom to a platform of mass mp, and at the top to a massless cup. The platform rests on a scale. A ball of mass mb is placed in the cup. What is the reading on the sacle when...

Hi, I am studying an engineering program in university. I have a piece of lab coursework to do and I am struggling to find information on it. The lab report was based on 'The discharge of a capacitor with time using an oscilloscope' It sounds silly but what is the theory of a capacitor...

Homework Statement http://img166.imageshack.us/img166/6047/cilinderox6.jpg Homework Equations Tangent Acceleration, Linear Acceleration The Attempt at a Solution I tried to made a free body diagram but i got confused with the inclined plane I am stuck there. Also with the...

Urgent question but simple problem:Phase difference Homework Statement What is the phase relationship between voltage and current? i = 5sin(wt+30) V = 10sin(wt+140) Homework Equations The Attempt at a Solution it seems that drawing using cartesian, the voltage is leading the...