Application Definition and 998 Threads

Dear all, I just finished my GRE general test yesterday, and my score in verbal reasoning is low (147). I am worried about the effects of this score on my graduate school application, but I have heard from some of my friends that the verbal section does not matter much for a Physics...

Greetings everyone in MHB. :) Well I've just created a thread to just verify if my answer is correct. On a simple problem that using implicit differentiation. A cylindrical tank of radius 10 ft is having drained with water at the rate of 200 f^3/ min. How fast is the height of water changed...

Hallo everybody. Foreword1: I am an engineer not a physicist Foreword2: I am reading a paper about diffusion MRI who refers to harmonic oscillator hamiltonian. The paper sometimes mention the Fokker Planck equations. Now, I don't want yet understand the relationshipt between...

Homework Statement I want to know why the book says that when ρ>c, there is no current and the magnetic will be zero Homework Equations Hø=I/2∏ρ The Attempt at a Solution I was trying to find the magnetic between the gap by using the formula... I've found that the magnetic magnetic...

Dear PF, This is my first post, so please pardon any faux pas. I've had some difficulty wrapping my head around the concept of torque. I have taken multiple classes on dynamics, statics, etc. I understand it theoretically, but not practically. A friend presented me with this problem...

Homework Statement I am currently doing the phy project on length vs resistance of wire. to reduce the power loss in transmission wire, the length of wire must be short, as power loss = (I^2) R... in my experiment , I fixed I (current) , now i am asked to find the application of low...

Does anyone know any specific examples of real world application of Active Stabilization Tanks in a ship? I just need a link to an article or just a name of ship IF one exists. I have been doing some research into A.S.T's and I am desperate to find out if the concept has been manufactured. I...

Hi everyone! I have a question for you all. I'm a 3rd year undergraduate math student who took 4 years away from school and I'm going to be returning this Fall(^.^). Prior to leaving school, I'd take courses in C++, Numerical Methods, Two additional semesters of Numerical Analysis, Modern...

hi guys, I wonder if I have fully understood the Fermi Dirac statistics properly, but I have a question on it regarding its application in the white dwarf research. I read the Fermi energy is applicable for T=0, now if the core of a white dwarf is too hot then how can we apply the Fermi Dirac...

I don't know under what forum to post this but since I am learning about it in calculus, i guess ill just put it here for now any maybe itll get moved to the right place. I'm given a simple circuit with resistance $12 \varOmega$ and the inductance is $4 H$ with a voltage of $40 V$. Find I(t) and...

For the first one, I'm completely dumbfounded. I used the SA formula for and ended up getting 2 $π\int_{π/6}^{0} \, cos2x * √1+4sin(2x)^2 ) $ And took u = sin2x, ultimately giving me $ π\int_{√3/2}^{0} \,d (1+ 4u^2)^(1/2) $ I'm lost as to what to do next. I'm almost definite that my...

what is diff in application of 3 & 4 roller plate rolling machine. which type of rolling machine more usefule for 6 mm plate... & please suggest the ways to reduce the flatness of end portion after rolling ...

when Schrodinger equation is applied to SHO only positive value of potential energy changes it to Hermitian polynomial and hence solution is possible but potential energy is positive only when the particle is moving away from the the mean position.The sign of potential is negative when the...

Homework Statement Suppose p(x)\ =\ a_0\ +\ a_1x\ +\ a_2x^2\ +\ ...\ + a_nx^n. Now if |p(x)|\ <=\ |e^{x-1}\ -\ 1| for all x\ >=\ 0 then Prove |a_1\ +\ 2a_2\ +\ ...\ + na_n|\ <=\ 1. 2. Relevant Graph( |e^{x-1}\ -\ 1| ) The Attempt at a Solution From the graph we can conclude that p(x)...

a man spent 78 dollars for cigarettes. has the price per box been .50 cents less, he could have had one more box. How many boxes did he buy? this is where I can get to let $x=$ number of box bought $\frac{78}{x}=$ price per box $\frac{78}{x}-.50=(x+1)$ solving for x I get 177.27 but I...

please check my work. Pipe A can fill a given tank in 4 hr. If pipe B works alone, it takes 3 hr longer to fill the tank than if pipes A and B act together. How long will it take pipe B working alone? let $x=$ required time for B working together with A $x+3=$ required...

I'm using an Arduino with some load cells to collect weight data over long periods of time (days etc.) and I'm using a 12V lead-acid motorcycle battery to power the entire thing. My electronics only need 7V to operate, so I am essentially wasting 5/12 (~40%) of the power. The entire setup...

I'm applying for grad school in the fall and I need some opinions about my chances, where I should good, etc. I am majoring in math, with a minor in physics. I went to a community college then a UC. At my community college, I had a 4.0 major GPA, 3.8 overall GPA. At the UC I'm at now, I have a...

each of two brothers can wash a car in 1hr; however, their sister can wash a car in 45min. If the three work together, how long will it take to wash the car? my solution, $\frac{1}{60}+\frac{1}{60}+\frac{1}{45}=\frac{1}{x}$ multiply by 36,480x I get $810x+1215x-36480=1350x$ solving for x I...

Homework Statement http://i.imgur.com/oogkT4K.png Homework Equations y = (x-h)^2 + k The Attempt at a Solution y = (x-95)^2 + 10 ? We were assigned this in class but my teacher never taught us anything about these kinds of problems. I've learned basic parabolas and equations...

please help me get started with these problems. 1.) It took a faster runner 10 sec longer to run a distance of 1500 ft than it took a slower runner to run a distance of 1000 ft. If the rate of the faster runner was 5ft/sec more than the slower runner, what was the rate of each? 2.) It is...

Something that I haven’t given much thought to, until recently, is probability. This book I have been reading goes into likelihood of certain scenarios, which have already occurred, and makes arguments for/against said scenarios based on probability. This argument(s) started a thought within me...

Homework Statement can anyone expalin where to get the equation for max growth? and the value? this is not my working. this is just the sample ans. Homework Equations The Attempt at a Solution

For several years I have restored antique movie theater popcorn machines from the 1940's. I design and manufacture obsolete parts for these machines for restorers across the nation. I am currently prototyping a reproduction "popcorn stirrer flexible drive cable" and am in the process of building...

Hello Forum, in the case of two or multiple free vectors, it is easy to determine graphically (head-tail rule) the resultant vector (magnitude and direction). The resultant vector is also a free vector. A free vector is actually an infinite number of vectors with the same magnitude and...

Homework Statement I apologize for not utilizing built-in Latex, I'll have to work with that a little more.Question statement: Explain the paths, both transmitted and reflected, that a light ray of 400nm would take if it was incident perpendicular to the bottom face ofo the crystal. If the...

What are the applications of Adams-Bashforth-Moulton Method for O.D.E.'s in the real world? How we could utilize this method in other branches of science?

I'm wondering what kind of etiquette one should follow when applying to university. Right now I'm in CC getting all of my calculus, diff eq, and linear algebra done. That way I can apply to OSU (Oklahoma) for mechanical engineering. Next semester I'm taking Calc1 then spring I'll be taking...

Homework Statement hi, i have difficulties in this question... can you teach me how to get the ans please... i don't have the ans . this involved differential equations Homework Equations The Attempt at a Solution

I'm applying for Pusan National University (Busan, South Korea) undergraduate admissions and Physics is my choice of major the question they ask is: Please describe how much have you learned about your intended major? do they want to know my previous experience about learning Physics...

How do you use the virial theorem to derive the van der Waals equation of state?

Land Rover's "Vanishing" Hood -- Clever application for the HUD This is very clever, IMO...

I am planning to do a small project based on piezoelectric effect. The idea is to sandwich a piezoelectric crystal in-between metal plates and use it as a school bell or a small calling bell. I am planning to use a battery (need not be full, which holds charge enough to ring the bell for the...

Olympic Track. To host the Summer Olympics, a city plans to build an eight-lane track. The track will consist of parallel 100-m straightaways with semicircular turns on either end as shown in the figure. The distance around the outside edge of the oval track is 514 m. If the track is built...

1. Average Speed. Junior drove his rig on Interstate 10 from San Antonio to El Paso. At the halfway point he noticed that he had been averaging 80 mph, while his company requires his average speed to be 60 mph. What must be his speed for the last half of the trip so that he will average 60...

Can I use the piezo-electric crystal to charge a small battery and connect the battery to a load. The problem here is that the battery has to supply current to the load for a short period. Then it has to be recharged by the crystal. will I be able to use the same battery for charging and...

I need help with these problems. 1. Speed of Sound in Air. Two seconds after firing a rifle at a target, the shooter hears the impact of the bullet. Sound travels at 1100 feet per second and the bullet at 1865 feet per second. Determine the distance to the target (to the nearest foot). 2...

If 3 m e n do a job in 12 days and two of the me n are three time s as fast as the third, how long will it take one of the faster men to do the job ? this is how I solved it let x = required time for one of the faster men to do the job alone 3x = time taken by third to finish a job...

Homework Statement This is not exactly a homework problem. It is just a bump in my own spare time calculations that i can't seem to get through. When trying to model a drum membrane (the physical details are not important) I came up with the following equation for the radial component of the...

The annual sophomore class picnic is planned by a committee consisting of 17 members. A vote to determine whether the picnic should be held at the beach location or in the mountains resulted in a victory for the beach location. However, if two committee members had changed their vote from...

Every freshman student at a particular college is required to take an english aptitude exam. A student who passes the examination enrolls in english composition, and a student who fails the test must enroll in english fundamentals. In a freshman class of 1240 students there are more students...

heyy im from delhi, india. i completed my 12th grade 2 years ago with science subjects and scored 44% overall. to improve my marks, i did my 12th grade again by giving 'improvement examinations' (improvement examinations are normal 12th grade/high school final exams that take place every...

I've been tasked with designing an experimental rig for some students and have run into a bit of a cul de sac with this particular issue. Allow me to elaborate: A beam of known geometry (length, depth, width, etc.) is being bent over a hollow cylinder. The beam has holes machined through at...

I'm considering applying for some internship/job this summer if my plan A doesn't pan out. Listings are utterly sparse, though. I'm sure there are opportunities out there, but from what I've heard, the smartest thing to do is contact the companies you're interested in directly instead of sitting...

Hello everyone, I am a first year graduate student, wavelets is one of the courses that I am taking presently. As part of the course, I plan to explore application of wavelets in computational electromagnetics (CEM). The idea behind it is to study a few applications where wavelets are used in...

Homework Statement A biologist determines experimentally that the number of calories burned by a salmon swimming a distance d in miles upstream against a current v0 in miles per hour is given by Energy = kdv^5/v − v0 where v is the salmon’s swimming speed relative to the water it is in...

1. Radium decomposes at a rate proportional to the amount at any instant. In 100 years, 100mg of radium decomposes to 96mg. How many mg will be left after 200 years? 2. if a population of a town doubled in the past 25 years and the present population is 300,000 when will the town have a...

Homework Statement If you have a radio equipment cabin that has a heat load of 15kW and you wish to stop the temperature becoming more than 15°C hotter than outside, how much 'free air' (outside/atmospheric air) needs to be circulated inside the cabin per hour? Homework Equations Q =...

2. the population of a community is known to increase at the rate proportional to the number of people present at any time t. if the population is doubled in 5 years how long will it take to triple? can help me find a model here.

Can someone show me how I would "use" the reduction formulae for tan^n x ? I just want to see an example on when I would ever use it. A simple one will do.\frac{tan^{n-2}x}{n - 1} - \int tan^{n-2} x dx