Final Definition and 1000 Threads

Hello, this is the first time I post here, so if this is not in the correct section please let me know... I'm working on solving the first final project in peskin - Radiation of gluon jets. In this project we assume a simplified model for the gluon - it is a massive vector boson (with a...

I encountered a problem related to merchandise allocation. We are given the present available quantity of an item and its demand for every store. Quantity to be allocated is also given. The requirement is to allocate units in such a way that the "final available quantity-Demand%" is the same for...

Let me explain my situation in short terms. 1. to get a degree here(malaysia), we'll need to work on an undergraduate final year project which is sort of alike thesis? basically an undergraduate research program. 2. I like theoretical or computational physics. Well, perhaps the math, quantum...

PLEASE HELP ME TO ANSWER THIS QUESTION I AM STUCK An ice cube of 75 g is drop into a glass containing 330 g of water at a temperature of 22 ' Celsius. The ice is at 0 ' Celsius and melts so that the temperature of the water decreases. Calculate the final temperature of the water when all...

Homework Statement A rock is tossed straight up with a speed of 20 m/s. When it returns, it falls into a hole 10 m deep. What is the rock's velocity as it hits the bottom of the hole? Homework Equations V = Vo + at Y - Yo = Vot + .5at2 v2 = vo2 + 2a(Y - Yo) Y - Yo = .5(Vo + V)t...

Homework Statement A 54.0 g ice cube, initially at 0°C, is dropped into a Styrofoam cup containing 327 g of water, initially at 19.4°C. What is the final temperature of the water, if no heat is transferred to the Styrofoam or the surroundings? Homework Equations Q=mc(delta)T...

Homework Statement A rock climber stands on top of a 50-m-high cliff overhanging a pool of water. He throws two stones vertically downward 1.0 s apart and observes they cause a single splash. The initial speed of the first stone was 2.0 m/s. a) How long after the release of the first stone...

http://www.nag.co.uk/sc22wg5/ It looks like Fortran 2008 is going through its final steps of standardization. What does this mean for scientific computing? Since people still use Fortran 90 despite new revisions up to 2003, will this go under the radar, or will this be a new and useful...

Homework Statement A 5 g lead bullet moving at 343 m/s is stopped in a block of wood. All of the kinetic energy goes into heat energy added to the bullet. The initial temperature of the bullet is 24 degrees C. What is the final temperature of the bullet in degrees C? (cPb = 0.128 kJ/kg . K...

I had a question about the final value theorem: lim sF(s) S->0 = lim F(t) t->infinity I was told I can only use this if I know that a final value exists for f, or in other words that f(infinity) exists. How can I check if it exists? If I have F(s), the only way...

i'm about 1.5-2 years away from graduation and I'm thinking about what i might build for my senior project. i was thinking of a pneumatic vehicle of some sort, maybe a go cart or motorcycle, which uses modified pneumatic wrenches as motors. some of these wrenches seem to make a decent amount...

Our team are doing "Electric Powered Wheelbarrow". Can some one help me where can find the theory. This Wheelbarrow using electric engine instead of petrol or diesel engine. 1.) Where can find the dimension of the wheelbarrow? 2.) 2D or 3D Drawing? I just want the drawing that shows every...

Whatever you think of the shuttle as an effective way of getting stuff to orbit it's still a cool piece of engineering. Here is a time-lapse movie of it's last day at work. http://www.airspacemag.com/multimedia/videos/Go-For-Launch.html ps. sorry you have to watch a 20sec ad first...

Homework Statement Its the end of the year in my AP chemistry class and one section of our lab final includes finding the molar mass of an unknown gas. we are given a balloon filled with the gas and we must conduct any tests to figure the molar mass outHomework Equations pv=nrt i believe the...

Homework Statement A student pulled a box of books weighing 68kg by a rope at an angle of 58 degrees above the horizontal plane of the floor. The floor has a coefficient of kinetic friction of µk=.27. What is the acceleration of the box of books? Homework Equations ∑F = ma Force...

Hey guys, I have my final exam in a week for my thermodynamics class. So far this year, things have been sort of roller-coaster-like. I did poorly on my first test because I was caught completely off guard. On my second test, I raised my grade substantially to the point where I was...

Hello, I am going to be taking the ACS physical chemistry exam in a few days and am trying to find out the materrial that will be on it. The ACS website leaves out a lot of stuff in there description.

I am taking an undergrad course P Chem II: Quantum Chemistry and Spectroscopy...and the final is a standardized exam from the ACS. I was just wondering if you guys had any tips or knew where to find old exams to practice with. I just was looking for any advice in general too. Thanks a bunch!

Oxygen gas having a volume of 1000 cm3 at 45.0°C and 1.01 *10^5 Pa expands until its volume is 1450 cm3 and its pressure is 1.06 * 10^5 Pa. a) Find the final temperature of the sample. t2 = (p2v1/p1v1) * t1t2 = [(1.06*10^5 * 1450 *10^-6) / (1.01*10^5 * 1000 *10^-6)] * 318.2 = 484.2I input...

Using these two formulas derive the third formula: D/l = (D+f)/(l+alpha) D/r = (D+f)/(r+beta) D=(fb)/(alpha+beta) where D is the distance of the point from the line between the viewer's eyes; f is the focal length of the lens in the eye; b is the distance between the two eyes; and...

Final exams -- need help with study schedule Hi all. I am a 2nd year ChE major. I've done pretty well in my gen physics, chem, calc courses and have almost all of my humanities done. This semester I'm taking Thermodynamics, Organic Chem, Linear algebra, and a history course. I'm also working in...

Homework Statement Two balls roll towards each other. Ball A moves to the right with velocity 5 m/s and ball B moves to the left with velocity 3m/s. If both balls have the same mass, m=50kg, determine the final velocity of them if they move off together after collision. In which direction will...

Hello people, this is my first post here in PF and I have a problem with the modeling of a pulley system considering the friction between wire and pulley. I have a similar system as show in the image below and I have a friction factor of 0.25 between wire and pulley, my question is, how can I...

Homework Statement A man pushes a chair that weighs 60N with a force of 25N. The chair has a final speed of 4.0m/s. and a kinetic friction of .27. What is the acceleration? Homework Equations i have no idea where to start, i tired this formula that had me find distance but the...

Yeah, Yeah ! Iron Maiden will launch this summer a new album called "The final frontier". Those guys are ageless! British Heavy metal owns :devil:

Firstly, do gamma rays spread out evenly or do they spread in random directions? Secondly, how do I test the effect of gamma ray radiations intensity at different direction in a way comparable to the effect of light intensity on an LDR? thanks!

dleted due to error

Homework Statement A high-pressure gas cylinder contains 20 ℓ of toxic gas at a pressure of 1.8 \times 10^7 Pa and a temperature of 24 °C. Its valve cracks when the cylinder is dropped. The cylinder is cooled to dry ice temperature (–78.5 °C) to reduce the leak rate and pressure so that it...

Homework Statement A car with a mass of 1000 kg traveling with a velocity of 15m/s east collides with a 1200 kg minivan traveling at a velocity of 20m/s north. After the collision the car and the minivan are stuck together. Draw to the scale the final velocity vector of the car and minivan...

Homework Statement Given the figure below and knowing that the coefficient of restitution is e=0.8 find the final velocities of the spheres. Homework Equations m1v1 + m2v2 = m1v1' + m2v2' e = v2' - v1'/v1 - v2 The Attempt at a Solution I have tried this a bunch of different ways...

Homework Statement Lets imagine that in the movie 2010. The Discovery is rotating then they find it. Every time the ship reaches a speed in the circular motion of 24000 km/h the engine gives a burst of energy. Which amounts to 20 kN. The mass of the Discovery is 30.000 kg. The time from the...

Hi everyone, I'm a final year student majoring in physics in china, but I feel very confusing about my future. since I have not applied for any master or PhD program this year, I plan to work for a year before I make any decision regarding my study next year. Personally I am interested in the...

If the initial velocities of 2 particles are given, and the masses are equal, then is there some limit on what the final velocities can be? m1v1i+m2v2i=m1v1F+m2v2F (initial velocity of particle 2 is zero; v2i=0) v1i=v1F+v2F To clarify my question if particle 1 has an initial velocity...

Homework Statement 2.78 kg block is pulled (from rest) by a force (horizontal surface) of 15.8 N. The coefficient of kinetic friction is .106. What is the velocity after 2.88 m? Homework Equations fk=N(uk) Vf=sqrt((2*W)/m The Attempt at a Solution I attempted to find the final...

I need to be able to calculate the final velocity of an object accelerating towards a mass from a distnce with an initial velocity. From my little knowledge of calculus, I am only a junior in high school, i have figured out that this is probably a derivitive problem. But i have no knowledge of...

Homework Statement A 1.00 micro-F capacitor charged to 50.0 V and a 2.00 micro-F capacitor charged to 20.0 V are connected, with the positive plate of each connected to the negative plate of the other. What is the final charge on the 1.00 micro-F capacitor? Homework Equations Q = CV...

Homework Statement I'm going to be doing a lab, in which I am going to push a block down a ramp. So right now, the problem I'm going to ask is conceptual, and not actually with numbers. So basically, I need to find the theoretical acceleration, and the theoretical velocity. Then, I need...

final velocity...need help! Homework Statement An object is to be thrown through a window 3.25 m high a distance 8 m away. It is launched at an angle 75 degree above the horizontal. The initial launch speed at the specified angle which will allow the projectile to pass through the window is...

Homework Statement A 1.22 kg piece of iron at 126.5 degrees Celsius is dropped into 981 g of water at 22.1 degrees Celsius. The temperature rises to 34.4 degrees Celsius. What will be the final temperature if this same piece of iron at 99.8 degrees celsius is dropped into 350 mL of glycerol...

just a quick question! will the final velocity of a free falling object always be negative even if the answer is positive?

Homework Statement A train on a straight, level track has an initial speed of 35.0 km/h. A uniform acceleration of 1.50 m/s sq is applied while the train travels 200 m. (a) What is the speed of the train at the end of the distance? (b) How long did it take for the train to travel the 200m...

Homework Statement The derivitive of the Xfinal=.5at2+Vinitialt+Xinitial Homework Equations Xfinal=.5at2+Vinitialt+Xinitial Xfinal= Final distance Xinitial= Initial distance a= Acceleration t= Time Vinitial= Initial velocity The Attempt at a Solution I have attempted the...

Homework Statement I am trying to calculate the estimated final velocity of a R/C hovercraft i am trying to built. The craft's weight is 6lbs and it is powered by a electric ducted fan that produces 21.3 ounces of thrust. Assuming this craft is actually hovering (no friction with the ground)...

Homework Statement An airplane flying 914 m above the ocean at 116 km/hr is supposed to drop a box of emergency supplies to the survivors of a shipwreck on an island. At what final speed will the supplies land on the island? Homework Equations The Attempt at a Solution So Vx =...

Homework Statement A steel tank with a volume of 5 m^3 contains saturated R-134a at 10 Celcius. The liquid is then boiled away and disappears at 50 Celcius. What is the final pressure? How much liquid was boiled away? Homework Equations PV=nRT The Attempt at a Solution I pretty...

Homework Statement A 0.10-kg object moving initially with a velocity of 0.20 m/s eastward makes an elastic head-on collision with a 0.15-kg object initially at rest. What is the final velocity of the .10 kg object after the collision ? Homework Equations im not sure which equation to...

These are British Columbia (Canada) Practice Provincial Exams.. These are geared toward the BC Curriculum, however it does not defer greatly from other areas.. Select Grade 12, and check physics on the next page.. Great review material. http://www.bced.gov.bc.ca/exams/search/

Finally got my Diff. EQ. final grade in I took the final last Tuesday (a week from yesterday). I was eagerly (really anxiously) awaiting the final grade. Strictly looking at the numbers going into the final, my grade was probably a C+/B-. The entire semester I wondered if there was some kind of...

Well, I got a D grade on my intro physics final, which means i got the credits for the course, but my gpa has dropped down a few points. My teacher is not to blame but he sure didn't help either...he has a passion for the subject, but not for teaching. Anyway, I guess i should take it...

i have an A in chemistry, and i have been stressing that i will bomb this final exam, and all the hard work that went into getting an a will not be noted, because my final will turn into a C for the whole semesters .