Application Definition and 998 Threads

Hi Does there exist a material whose state it is possible to change from a solid to liquid by application of electric current? Obviously a large enough current will melt anything, but what I mean is is there some other mechanism, other than brute force heating that can cause a solid to...

Hello, do you know some specific application of (E)-4-hexen-1-ol? I have already surch info. on google how to synthetise it but I didn't find what for this compound is really used. thank you

I need a collimation material that is faily cheap and has a reflectivity of about 95% for both infrared and visible light. I know polished aluminum meets the criteria for the infrared, and the fused silica also works well for the visible spectrum, but I need somthing that can collimate both.

The electric potential V at a distance R along the axis perpendicular to the center of a charged disc with radius a and constant charge density d is give by V = 2pi*d*(SQRT(R^2 +a^2) - R) Show that for large R V = pi*a^2*d / R This is what I have done so far... V = 2pi*d *...

Hi every body! does anyone seen live specimen under the microscope? How does live specimen moves and interacts? What kind of scope do i need to have darkfield and brightfield application? Is there any scope that can be used in two applications?:confused: Would anyone help me choose what kind...

Graduate School Aplication (about dropped courses) Hi So i am a math majour, and i took a 3rd year finance course. I wrote the midterm (for the finance course) and just bearly passed - i got ~50% on the midterm and it is worth 25% of our final grade. I am 3rd year. If i drop the...

I just took over a project for a person that left the company. The project was supposed to be fully documented, but the documentation seems to have come up missing. The application involves using a microcontroller as a PID controller. I will have a desired speed, and the actual speed. I...

A mass weighing 8 lb stretches a spring 1.5 in. The mass is also attached to a damper with coefficient γ . Determine the value of γ for which the system is critically damped; be sure to give units for γ . I have no idea where to start. Can someone help me out?

Question: A particle of mass m starting from rest at x=1 moves along the x-axis toward the origin. Its potential energy is V=\frac{1}{2}mlnx. Write the Lagrange equation and integrate it to find the time required for the particle to reach the origin. Lagrange Equation in 1-D...

This is a theoretical question: Say you bore a hole through earth, suck out all its air, and drop an object in one side. Let's say it takes 42 minutes for the object to come out the other side and come to complete stop (only to then drop back down, of course) Now let's say you drop an object...

pls, someone explain for me "formal methods to electron correlation in metals, magnetism, superconductivity ."

The school taht you go to get your graduate matters more than the school you go to get your undergrad. I'm going to start my undergraduate at Texas A&M this Fall. It's not a very prestigious college, but it's close to home and I like the campus (I didn't want to go to UT and the campus was one...

I am doing some work on high school (Australia) level combinatorics. So I've been taught nCr, nPr, and of course factorial (!). Now I need to apply the combinatorics to probability. There a two questions which I am stuck on. I calcualted that the sample space of all combinations was...

I was wondering anyone could help me figure out the type of valve I need. The application is I have two sources of water going into the same reservoir and I want to be able to switch between the two. I am currently looking at Direct-Acting Solenoid Valves 3 way Now I am noticing some...

what is the theory and application for damping:confused:

2 The displacement of a particle from a fixed point is given by x = t(6 − t)(t + 1), 0 ≤ t ≤ 6. a Find the exact time when the particle is a maximum distance from the fixed point. b Find the velocity, v, when t = 3. c Find the exact time when the particle is at maximum velocity. d Find the...

What are some real life applications of those that were developed in the past 10 years?

My book makes many statements about how magnetic monopoles do not exist and how scientist and researchers are trying to accomplish this. They also state that this would have wide applications. What they don't say is what and why? I see that if a magnetic monopole were to exist it's...

Question: At airports, departure gates are often lined up in a terminal like points along a line. If you arrive at one gate and proceed to another gate for a connecting flight, what proportion of the length of the terminal will you have to walk, on average? One way to model this situation is...

I need some help. I fitted a 7th order legendre polynomial and got the L0 to L7 coefficients for different ANOVA classes. How can I get a back transformation in order to plot each class using the estimated coefficients? Thanks to anybody. Roberto.

Can anyone recommend an application for PC that can take an audio recording, perform a Fourier transform, and return the audio recordings' frequency spectrum AND phase information? I can find plenty of programs that return the frequency spectrum, but I've had no luck finding one that...

this problem is an excerpt from an explanation of a time wieghted performance method. I feel that if I can follow this part the rest of it will make sense. now i know the answer is .1259 but I'm a little fuzzy on how exactly they got that, and their 'step by step' seems to miss some steps. it...

OK, https://www.physicsforums.com/showthread.php?t=107206"opensource s/w. We've had a timeline imposed that may preclude developing using an opensource solution. Now I'm looking for something that we can buy and customize to our needs. I'm not sure what kind of software this is called. It is...

I can't seem to find a definitive equation for calculation of LLD (lower limit of detection). Cember has one equation, and other sources I research have completely different equations. I'm more apt to go with Cember's equation ,especially seeing as many of the govermental guides have conflicting...

Hi. I know of the commercially available "battery-less" flashlights that use either squeezing or shaking mechanisms to generate electricity. I was wondering, however, whether I can create one that uses the difference of temperature between the hand and the room temperature. I propose to use a...

This is a problem I am doing for review, in the section of my book on the Urysohn lemma: A G_{\delta} set in a space X is the intersection of a countable collection of open sets in X. Let X be normal. Prove that if A is a closed G_{\delta} set in X, then there exists a continuous function f...

I'm having some trouble with this problem what i did was (15500 + 1000t)*e^0.05t > 1000 so basically, when the money you are making is greater than how much you would make by keeping the cards i know the first t = when you sell it, but what is the second t? that should be the amount of time...

Find the volume of the right cone of height 9 whose base is an ellipse. Major axis 12 and minor axis 6.

Hey, new member here, and I'm stumped on a physics problem. Two weights are tied onto each end of a piece of rope and set on a table. The rope has a scale on it. The two weights are hanging over the edge of the table - one has Fg of 100 N, the other has Fg of 50 N. What does the scale read? My...

Heres an intersting problem i would like to see max-min based solutions for. Fine the maximum length of a bar to be transported horizontally around a 90 degree corner. That is, from a corridor of width a to a corridor of width b. ----------- --------l l l l thanks

This is kind of a stupid-sounding problem but here it is: Stadium Popcorm Problem A piece of heavy stock paper is cut into a circle with a radius of 4''. The paper is cut form one edge to the center and shaped into a cone-shaped holder. What is the maximum volume of the resulting cone...

Two loops, A and B, are aligned parallel to each other. There is a current in loop A, which induces a current in loop B. How does the current in loop A change with time? By Lenz's Law, the current in loop B creates a magnetic field which opposes the change in magnetic flux which created it...

ok here is the problem <br>A uniform meter stick of mass M has a half-filled can of fruit juice of mass m attached to one end. The meter stick and the can balance at a point 33.0 cm from the end of the stick where the can is attached. When the balanced stick-can system is suspended from a...

Hi, I'm a first year university student interested in medicine as a career. My marks are relatively good (it's early, but GPA~3.9), but my weak subject happens to be physics and I am considering dropping it to retake it either over the summer or next term. It will be without penalty on the...

Consider the set-up illustrated in the attachement. The radius of the capacitor plates is a. The field btw the plates varies according to \vec{E}(t) = \frac{It}{\epsilon_0 \pi a^2}\hat{z} (z is to the right) So since the current enclosed is 0, Ampere-Maxwell law in its integral form...

A large root beer keg of height H and cross sectional area A1 is filled with root beer. The top is open to atmospheric pressure. At the bottom is a spigot opening of area A2, which is much smaller than A1. Find the total time needed to drain the keg if H=2m, A1=.8m^2 and A2=10^-4 * A1.

I was orginally going to finish classes this summer and apply for graduate school for next Fall, but due to dissapointing gre scores I am considering delaying my application for another year. This will let me prepare for the general gre and I will be able to take QM II and CM II before taking...

I remeber reading somewhere that it is possible to get your application fee waved for graduate school. What is necessary for me to do this? Do I just have to tell the dept that I can't afford the fee. A friend of mine gets financial aid, so he said he doesn't have to pay the fee. Anyone know...

I sometimes do informal math tutoring for other high school students online and am looking for a whiteboard application similar to the one featured with MSN Messenger, but as a standalone program. The reason I wish to avoid MSN Messenger's whiteboard is because my router gives me problems when...

Hi, i got a task in school, in which I shall find as many application of the Fourier series And Fourier Transforms as possible. Any suggestion? Kindly Paul-Martin

Hey everyone, It is the time of my life where I am getting ready to apply for an undergraduate program. I live in Canada, however would love to have the opportunity to study in the states. I am absolutely sure that I want to study aerospace engineering, and am in need of some help narrowing...

my question is at particular pont on any object some force has been applied. or it will experience a couple or moentum. how to calculate the force at some distance away from that particular point whare exactly the force has been applied.

Last year I completed two courses in the space of one, so this year I may have the possibility of having a free period. I was just wondering if having a free period looks bad to universities even if I have all my credits.

Hi everyone. I would really appreciate it if someone could check my work. I was really unsure on how to do some of these. I'm sorry it is so long. 1.) Let R denote the region between the curves y=x^-1 and y=x^-2 over the interval 1<= x <= 10. a. Set up an integral for the area of R...

I'm doing a presentation in this topic and I find it very hard to look for information on the web. Please, point me to any website or resources that have information about this topic? Thank You~! :confused:

Hi, does anybody who knows the applications of backward type wave tell the detail of them? thank you very much!

can anyone help me in solving my doubt that what is the application of special functions and Hermite,Legenders,Laguerre function to the various branches of physics. could u please specify any link or site adress. thank you :mad:

Hey friends, i wud like to know abou various ways of application of non conv. energy (tidle,wind,solar etc.) sources.i am looking for some innovative idea & also easy for implementation. any suggestions are welcome.

"a 5m ladder is placed against a wall. the top of the ladder is sliding down the wall at 0.5m per second. at what rate is the bottom of the ladder moving away from the wall when the bottom of the ladder is 3m from the wall. ? " Dirac.

Hey all, I'm a bit stuck on a problem on my online homework for my calc 3 class, hopefully someone can help me out. Suppose that you push with a horizontal force on a box, to push it up a horizontal ramp, as shown in...