Thanks Definition and 224 Threads

Hey guys, Do the quarks determine the element? If I have a atom that has let's say 5 neutrons and 5 protons, and then all of a sudden one of the quarks changes from a down quark to a up quark, this will then change the ratio/amount of protons and neutrons thus changing the element? What...

I'm thankful for your service :approve:.

Can someone explain the following statement for me? The best you can, would really appreciate it. "A wave function or wavefunction is a probability amplitude in quantum mechanics describing the quantum state of a particle and how it behaves. " I am trying to learn/understand how something...

Homework Statement Air is being pumped into a spherical balloon. Suppose we know the surface area of the balloon increases at a rate of 20cm^2/s when its radius is 4cm. What is the rate its volume is changing at that instant?Homework Equations The Attempt at a Solution I went... dv/dt = 4∏...

I'm an engineer student and I'm trying to build such a solar heating system that it is drum with two layers, inner one is a metal (aluminium alloy I'm thinking) water container and outer layer is made of polymer, with air gap in-between. When suns come out, it radiates through the polymer and on...

Homework Statement Ok, you can see the question and how far I got from the image. Lim x--> infinity So, let's take the LEFT side: how does 3x-1 / x turn into just 3? I know the answer is 3, but from where you can see in the pic, that is where I get stuck, and don't know how to go on...

#1: Homework Statement A projectile is launched at an angle of 64.9 degrees with the horizontal (x axis) at some unknown velocity. After 4.6 seconds, the object's angle of trajectory is 40.3 degrees above the horizontal. What is the object's vertical displacement at this time in meters...

i have some physics problems, please help me, thanks! Question 1: Question 2: Question 3:

It's been two years as of two days ago that I joined you all here on PF. In that time I have gone through several life changes, including leaving the active duty air force and moving to Arizona. I don't think I can describe the impact this forum and all you wonderful people have had on me in a...

Homework Statement Here is the problem: Homework Equations The Attempt at a Solution I need help RIGHT from step one. Now, step one I would suppose I need to evaluate g(x) ? Which, would be x must be greater than or equal to -5. Correct? Then what?

Homework Statement Ok, just doing a re-fresher here! 2x^2 - 7x - 2 Factor it... First, let me ask you guys, when you see this, what is the FIRST thing you think of doing? The Attempt at a Solution For me... And I do not think this is correct. I would first automatically...

Homework Statement Just doing some review, and I keep getting the wrong answer. Can someone explain this for me please? The equation of the straight line through the points (-€2; 1) and (2; 3) is Book says the correct answer is 2y = x + 4 What are the steps to get 2y = x + 4 ...

Homework Statement a human cannonball in 1940 soared over three ferris wheels, each 18 meters high covering a horizontal distance of 10.63 meters. Assuming that the point of projection is 2.50 meters above the ground and that he landed safely on a net placed at the same level, find his initial...

you folks do a lot of work that many of us seldom see... cleaning up after trolls, gently advising advisors, keeping it a dignified place. Thank You ! old jim

Hello every one, I do not know if this thread is in the right place, if it is not I can repost in appropriate place. I do not want to bother any admins or high users because of my error. I always had a passion for physics theoretic but never found myself good at math. Currently I am pushing...

Homework Statement Assume that you travel through space to a strange universe where the allowable values for the quantum numbers are quite different from those in our own universe. In this new universe, s orbitals may contain a total of 2 electrons, p orbitals may contain a total of 4...

Homework Statement I have to write the formula for Chloroform. As seen in this image: Now I know it has 3 atoms of CL, 1 atom of C, and 1 atom of H. I know the answer is CHCl3 But...why is that order. Why not Cl3CH ? Homework Equations The Attempt at a Solution

I have uploaded the journals which related to the brushless dc motor. I encountered the problems as i don't know how to simulate the voltage source inverter of the Brushless dc motor system (the generation of inverter line to line voltages) and the hysteresis current block. i really need help...

Homework Statement y' - 3y = 13cos(2t) y(0)=1Homework Equations y' = sY(s) - y(0)The Attempt at a Solution heres all my work.. i am confused as to why its not matching book solution.. i think (geussing) that I probably messing up the decomposition step..thanks for any help with this...

RPM to Pulley Question Please Help Thanks! I have a log splitter that uses a gas engine 3600 RPM the drive pulley is 1.5"OD diameter and the driven pulley is 18.25" diameter (Super Splitter is the brand name) So from what i calculated was the driven pulley weighs in at 75lbs and spins at about...

Homework Statement 4y'' - 4y' + y = 0 y(1) = -4 y'(1) = 0 Homework Equations getting the coeff's gets messier and messier.. am i doing something wrong? The Attempt at a Solution 4y'' - 4y' + y = 0 y'' - y' - (1/4)y = 0 r_1 = r_2 = 1/2 general soln: y(t) = c_1e^(t/2) +...

I have worked several different jobs, such as a mechanic for 7 years, logger for 4 years and a welder for 3 years. long stories for each, but i am mechanically inclined. Everywhere i have gone i have been able to look at different things and figure them out quickly, how to fix them and how they...

Voltage Drop Between Sender & Receiver ...( help needed ASAP , Thanks in advance ) hello every body I'm EE student and I'm new member here ... in a deep need for your help & knowledge I'm doing some reading about the power transmitted from the sender to the receiver end , As we all know...

Homework Statement Below is the image of the question I am having trouble with. B) and C) I need help with! Homework Equations The Attempt at a Solution Can anyone point me in the right direction? B and C are my trouble questions. I don't know how to prove that the...

Homework Statement A 320 kg wooden raft floats on a lake in equilibrium. When a 75 kg man steps carefully onto the raft, it floats 3.5 cm deeper into the water. When he steps off, the raft oscillates for a while. I figured out that the force constant is 21,000 Nm - first off, is that...

Homework Statement Ok, below is the question. I am having trouble with getting started. Like the first steps. A and B are the questions I am having trouble with. "A 1.00 kg glider attached to a spring with a force constant of 25.0 N/m oscillates on a frictionless, horizontal air track. At t...

Thanks to the American Physical Society for my New Calendar! Not only is the calendar nice, but the envelope it came in is just the right size for me to work out all my new equations without having to spring for an easel-size paper tablet or a chalkboard! (I'm a little on the cheap side!)...

Homework Statement http://bhs-jones-physics.wikispaces.com/file/view/torque+wkst.pdf questions 2 3 4 5 please!

Homework Statement I am not understanding this. This is the question, and the correct solutions for the question I need help with. I really don't understand how to get the answer here! Can anyone help me? First steps? Question: Answer: Homework Equations The...

I have the infinite series... \sum n^n/n! somehow, I need to use the Ratio Test... and shoe that the resulting limit is equal to e. I can't figure out what I am doing wrong algebraically. Right now I have simplified this limit to lim((n+1)^n/n^n). Please Help... Thanks.

Homework Statement This is not a homework question, but rather a review question. I have the answer, ill post below, but have no idea how to get to the answer :) Question: "A constant force of 90.0N acts on a ball while it has a displacement of 1.40m at 10 degrees below the x-axis. The...

Homework Statement Here is the question: "A ball moves through the air, and experiences a force of air resistance, in addition to the force of gravity. While it moves, its total mechanical energy decreases by 15J, and its gravitational potential evergy decreases by 25J" A: What is the...

Homework Statement Im working on some typical "Ramp being pulled up an incline" questions and have trouble understanding something. An example question where it stats a box is being pulled up a ramp like the image below: Image: http://i43.tinypic.com/jb486q.jpg Now, first: In order...

Homework Statement Here is the question I am having issues with... Below are my questions regarding it. Homework Equations The Attempt at a Solution Now when looking at this, first I would assume I use conservation of momentum. (K + Ug + Us)i = (K + Ug + Us)f + Ff d...

Homework Statement Hey all. Below is the question and picture related to it. "Three uniform metre sticks each of mass M are attached together as follows: Stick 1 lies along the y-axis from y = 0 to y = 1.0m. Stick 2 lies along the x-axis from x = 0 to x = 1.0m. Stick 3 makes an angle of 60...

help with buoyancy question thanks! An object denser than water rests on the bot- tom of a container full of water. The object has volume V and a density p = 4 pw, where pw is the density of water. What supporting force N does the con- tainer bottom exert on the object, in terms of pw...

Homework Statement A 12kg wad of clay is hurled horizontally at a 100g wooden block initially at rest on a horizontal surface. The clay sticks to the block. After impact, the block slides 7.50m before coming to rest. If the coefficient of friction between the bloack and the surface is .650...

Homework Statement Below is a snapshot of the question I can't seem to solve. I can't seem to find in my textbook how to work out this problem...:( Any pointers? Thanks! Homework Equations The Attempt at a Solution

help with oscillation problem! thanks i have no idea how to do this. could someone please explain how to do this. thank you, really appreciate it A mass of 311 g connected to a light spring of force constant 37.2 N/m oscillates on a horizontal, frictionless track. The amplitude of the...

Homework Statement I am getting ready for a midterm, and I got a list of stuff to study for the exam. Since I was put into the class late, I missed some intro stuff. Can some of you, whom probably know some good resources, give me a link or show me a sample code of the following: ...

Homework Statement Ok, I just finished my code for my program. And its not compiling, and I am not sure what's wrong. Below is an image of the errors and the code. http://i55.tinypic.com/in8x0y.png And my full code is below here: MOD NOTE: I indented the code below to make it...

Homework Statement Ok, I am doing a problem where I am finding the acceleration of a mass sliding down a ramp. I am now inputting the variables into Newtons 2nd law, and have the correct equation, but its not giving me the right answer. What am I doing wrong. Here is the quation...

Homework Statement Image below shows the questions. I need help with B and C - Finding the acceleration and the force... Homework Equations The Attempt at a Solution I am not sure how to find acceleration going down a ramp. So, B and C

Homework Statement Its a simple temp conversion program. NOW, my problem is when ever I enter a temperature to convert, it just keeps repeating NON stop until i hit ctr-C - Here is the code below. What am i missing and how do i fix this little error? / This program ...This program...

Homework Statement "A pail is suspended from a vertical rope, wrapped around a winch, so that the pail can be raised or lowered inside a well. The weight of the emply pail is 4 N. Suppose the pail is descending vertically with increasing speed. Is the tension in the rope larger than...

I thought you all might want to take a look at this degree inferred on me from a prestigious community college :smile: , that finally appeared in the mail almost 6 months after I earned it. [PLAIN]http://img710.imageshack.us/img710/218/imag0058cg.jpg I don't think it's any big deal (worth...

Homework Statement Ok here is the problem: 100 loaves of bread are to be distributed such that the quantities form an arithmetric sequence, among 5 people. The first 2 together receive 1/7 of the remaining 3, together. How much (loaves and fractions) does each receive? Homework...

in diode why there is creation of depletion region? advanced thanks.

Linear Algerbra Equation help :) Thanks Homework Statement Problem 20. Solve for x : 1.25x − 6 = x 1.25x −x = 6 (1.25 − 1)x = 6 On combining the like terms on the left. .25 x = 6 x = 24. On multiplying both sides by 4. Homework Equations The Attempt...

this problem was discussed by our professor . but I am a lil bit confused on it ! thanks ! help ! FIVE COPLANAR FORCES ACT ON AN OBJECT AND THEIR RESULTANT ! our prof use this formula ! Bx=Bsin(degree) By=Bcos(degree) ANSER: VECTORS X-COMPONENTS...