Lost Definition and 576 Threads

A 991kg car traveling initially with a speed of 32.2m/s in an easterly direction crashes into the rear end of an 8650kg truck moving in the same direction at 17.8m/s. The velocity of the car right after the collision is 10.4m/s to the east. How much mechanical energy is lost in the collision...

hello The following is really giving me troubles *What is needed for an object to circle around the earth? Let me rephrase this...what conditions need to be met for an Earth's gravity force to act as centripetal force instead of just pulling an object towards its center? *When you...

The question is: A 15.7 kg block is dragged over a horizontal surface by a 68.7N force acting 17 degrees to the horizontal. The block is displaced 4.65m, and the kinetic friction coefficient is 0.3. What is the energy lost to friction? My thinking is that it would be equal to the negative...

In a rotary vane compressor, the vanes constantly move in and out. Does the work required to accelerate the vanes radially outward and then inward cancel out or is the kinetic energy of the vanes lost and completely converted to heat?

OK, so I've been there before, Hilbert Space that is. You know, infinite dimensional function space. At least I thought I had, that is until I started reading A Hilbert Space Problem Book by Halmos. So operator theory, right. What's are bilinear, sesquilinear, conjugate linear, ect. -...

Yeah, so I am not too smart as I encrypted a file in Winace and now have forgotten the password for it. Are there any programs out there to get the pass or get through it, or any other way in which to access the files now that I forgot my password? Thanks in advance for any help you can...

I just had a midterm for my calc class and there was this one question that I spent a good 20 minutes on and could not figure out. can someone help me with the solution please? lim x→0 (sin x²)/sin²x I can do it using L'Hopitals rule, but that wasn't allowed :rolleyes:

Basic Physics...?? Hey Everyone, I just started the course and the first problem I come to, so very confused me! I don't need an answer just a basic response on exactly HOW I can approach this problem because I am just totally blown away by it . Two trains, each having a speed of 30...

After I have stripped the filters then one of my filters lost all the signals even the signals of the MW marker. What is wrong? The protocol for stripping is this: Warm the stripping buffer (62,5mM Tris-HCl pH 6.7 and 2% SDS) to 50C and put the filter in it for 30min at Room Temp (RT). Wash...

Hi, its me...AGAIN! You people should start CHARGING for your services! I have a conceptual problem more than just a homework problem this time. It regards free fall distance and the formula applied. Okey dokey...the formula to find out how far an object falls from rest is: d=1/2 gt^2...

sorry this is such a stupid question...but i have been sitting her for half an hour trying to solve it. what does a^2-4a-12 factorise to?

Hi guys, i am working on a problem involving crumple zones, and i was wondering which formula would be best suited to discover the amount of energy lost due to heat and sound, during a collision between a car and a wall

I am quite confused... I'll state that up front to make it simple. ^_^ Here is my question, though: Assuming that the universe at some point started from a singularity, err... or even that, assuming that the universe is expanding at a rate that has varied over time... I assume that it's...

Many people seem to view lives lost to terrorism as far more important than lives lost to causes such as obesity and cancer. This poll is to determine out in the open how many deaths by obesity or cancer are enough to equal one death by other causes. The question: How many deaths to cancer...

My sister lost a newt in the house. Is there anything we could use to track it's body heat? Like goggles or something that would show it's body heat? Is there anything else like that we could do? Just a quesiton. I guess it wouldn't give off that much body heat though I mean I read this...

http://arxiv.org/abs/gr-qc/0504147 this has been promised for a couple of years now. here at PF we studied the papers leading up to it there was one paper we discussed here by Lewandowski and Okolow (LO) and several by Sahlmann and Thiemann (ST) or by Hanno Sahlmann solo. The four of...

Some months ago, I lost (or perhaps Windows lost) about 1.5 GB of data. Actually, the files were still there, but the FAT got hosed. I did not realize it at the time and unfortunately had saved some stuff to the HD. Once I realized what had happened I got a copy of "File Scavenger" -...

Why does it seem that more people eventually achieve theism than atheism? Is there any reliable test of religious belief other than the word of the individual? How do we determine the faith of young children regarding whether or not there exists a God?

Im extremely intelligent, and the good amount of german in me always had me trying and trying until what i was after was perfect or nearly so. This included school projects, personal projects, just riding a single speed bike very far to hang with friends. I am a freshman now in college...

A crate of mass 10.0 kg is pulled up a rough incline with an initial speed of 1.50 m/s. The pulling force is 100 N parallel to the incline, which makes an angle of 20 degrees with the horizontal. The coefficient of kinetic friction is 0.400, and the crate is pulled 5.00 m. How much mechanical...

The question is: Between two long parallel cylinders of radius "a" and "b" (non-coaxial) and an axal separation of "c", a steady current of "I" flows. (See attachment below) Show that the inner cylinder (radius "a") has a constant magnetic field. Use Ampere's Law. [Hint: 0 = 1 + (-1)]...

Hi friends I have this tiny little problem on my Windows 2000 box: the show desktop icon has disappeared/accidentally been deleted from the quicklaunch bar (the taskbar). If you have any idea as to how I can get it back please do let me know. Thanks and cheers Vivek

Ok, I'm really lost here. I guess I do not understand the equations well enough to think on my own in this question :) So the question is as follows: Two simple pendulums of equal length are suspended from the same point. The pendulum bobs are point like masses. m1 > m2. The more massive bob...

Soppuse Alice have two particles A and C that are in a partly entangled state |Y(A,C)>. We also have another person Bob (ofcourse) with whom Alice share a pair of entangled particles D and E in the singlet state. Now suppose Alice make a measurement on her two particles C and D, she...

We have recently started studying rotational and rolling motion, I've struggled with this more than anything, I am pretty lost on these problems: 1) Consider a thin rod of mass 3.4 kg, length 6.8m, and uniform density. The rod is pivoted at one end on a frictionless horizontal pin. The rod...

I'm going to be getting a laptop soon, and I'm really ignorant about Computers in general, so I'd be really appreciative if I could get some help narrowing down the chioces of what'd be best for me from some of the computer geniuses here. I don't play any sorts of computer games like...

So, i got back from vacation today, and my mum helped me bring some stuff up to my room. Hugs, kisses, blah blah, and she slips me a 20. I pocket it. Then I'm sitting at the computer in my room, and I'm like, "hmm, you know, I'm so forgetful, i'd better not leave this 20 in my pocket, elsewise...

anyone remember where I lost them last time?

I got a airbrush for my birthday. I've never even held one before so I probably should have read the instructions. I don't have a compressor so I got a can of Propel, which appears to be full of butane. Anyway, I hooked the hose up to the can first, instead of to the airbrush first. As soon as I...

http://space.com/scienceastronomy/hipparchus_catalogue_050124.html

What should--or can--be done about "the environmental crime of the century"? by Christopher Reed http://www.harvardmagazine.com/on-line/010538.html With genocidal intent, Saddam Hussein decimated the Marsh Arabs and their unique environment. Can a place and a people's way of life be...

This is a simple question, but i can't seem to get my bearings right on it. Consider two speakers at essentially the same point emitting sound waves that are half a cycle out of phase but otherwise identical. Interference dictates that these two waves should cancel out. The resultant wave, now...

If 30 MW of power at 45kV (rms) arrives at a town from a generator via 4-ohm transmission lines, calculate the fraction of power generated that is lost in the lines. okay I think I'm not completely understanding what I'm supposed to do in this question, or I'm missing something as from my...

Having missed most of this material, I am finding myself at odds wih the last question of a homework assignment: A bullet of mass 4.0 g moving horizontally with a velocity of 500 m/s strikes a wooden block, initially at rest, on a rough wooden surface. The bullet passes through the block in a...

:blushing: I am getting confused. electrons, protons, which finger goes where in the left hand rule... agh! lol, I am muddling myself all up. i understand the rule (well i hope i do by now as that means the rest of my homework is wrong) but the last question of my h/w is almost killing me...

I'm having trouble getting started on this problem... I just really don't understand what to do. Solve X'+2X'+(\lambda-\alpha)X=0, 0<x<1 X(0)=0 X'(1)=0 a. Is \lambda=1+\alpha an eigenvalue? What is the corresponding eigenfunction? b. Find the equation that the other eigenvalues...

If a ball of styrofoam ( p=100kg/m^3) is totally submerged in water. the ball has a mass of 300g. How can i find the volume? and if it is being held by a string how do i find the tension of this string? :rolleyes: I don't know where to start! I've tried using the denisty equation but i still...

I have a love for building computers...I also have a love for the concepts of physics. I have been thinking about Quantum Computing. I am a strong math student. I am also a Junior in-high school. What would be good Career choices, either in quantum physics in general, or in Quantum...

I need to calculate thr force required to pull a copper ball of radius 2cm upwards through a fluid at the costant speed of 9 cm/s. The drag force is porportional to the speed with porportionality constant 0.950 kg/s. Ignoring the buoyant force, I need to caluate the force. I fould out the...

18 years old, emotionally fragile, and Kerry lost... Should I go jump off a bridge now?

Well, I avoided this class as long as I could... and now I am stuck with it! I am in a beginner class, but the course is way too fast, and I can't figure out what the teacher is talking about. We are dealing with graphs and 'Straight Line Motion' right now, and I am so lost. I have a test...

My teacher assigned this problem for homework and I'm completely lost in what exactly I'm supposed to do. Btw "logic works" is a program we use to implement the circuits. Using Logic Works, construct a circuit to detect overflow in 4-bit signed-2’s complement addition. Connect your circuit...

A person weighting 0.6kN rides in an elevator that has a downward acceleration of 1.4m/s^2. The acceleration of gravity is 9.8 m/s^2. What is the magnitude of the force of the elevator floor on the person? Answer in units of kN. -- A 1317.9 kg car is coasting along a level road of 33 m/s...

Are you out there somewhere? Who is lost? Are you out there somewhere? I seemed to have misplaced you and a few others... A little shout now and then is good - 'specially for people like me who have this need to keep track of others. Now! Where is everyone else, and what have you all...

I am totally lost! :cry: I am taking this math class and we are now doing these statics problems and I have no clue what is going on, as I have never taken a physics class. I was hoping if someone could just explain on how I can put these two word problems into a equation because I have no...

I've been trying to figure this problem out and I'm a little confused. Here is the problem. A quarterback is set up to throw the football to a receiver who is running with a constant velocity Vr directly away from the quarterback and is now a distance D away from the quarterback. The...

When we lift a heavy box to a higher position, energy from our bodies(chemical energy) is lost and there is energy gain(potential energy) in the box. After, when we release the box from that position to the original one(lower position), there is P.E. lost in the box. So where does lost energy...

Update on the lost Cuban "City" We have discussed the http://www.medioambiente.cu/museo/exmari.htm, discovered by Paulina Zelitski and Paul Weinzweig a few times here. Many near pefect symmetrical stone structures on the bottom of the sea, resembling old Mexican inca like structures Is it...

I lost my calculator batteries in a flood... What's this equal? \left(\frac{256^{16}-1}{256^{16}}\right)^{256^{16}} a) 2.178 b) 1.000 c) .3679 d) 0.000

OK, I give up. Categories seem to have been moved. I cannot find where the postings from hyperspace in cyberspace have been moved to. Can someone clue me in?