Lost Definition and 576 Threads

Hi, I've got a random question. To my knowledge a liquid crystal filter bends incoming light coming in from various angles towards one particular angle as light leaves the filter. Does anybody know the % loss of light caused by this action?

Qn2 The amplitude of a lightly damped osciallator decreases by 3% during each cycle of oscillation. What fraction of the energy is lost in each cycle? Okay..i couldn't find anything about energy in the damped oscillation is my textbook.. but in SHM sections. it showed that Energy of...

Not sure what forum this question belongs in... so I'll post it here. I understand the concept of gravity warping space but intuitively it's never sat well. But, hey, no one can be more a non-physicist as myself. So please permit me my ramblings so I can better understand where I must be...

How many of you play the game?

Homework Statement A curling stone with mass 20.0 kg leaves the curler's hand at a speed of 0.885 m/s. It slides 31.5 down the rink before coming to rest. Find the Average force of friction acting on the stone. I have no clue as to what to do with this question. Can someone just guide...

:frown: We're getting ready to go spend a couple days on Mt Rainier, and I can't find my hiking boots. This is terrible! They're my perfect-fit boots, nicely broken in but still in good shape. This is our first time out hiking this year...I don't even remember the last place I wore them...

http://news.bbc.co.uk/2/hi/uk_news/education/7431840.stm The article states the obvious, but now maybe things will start to change if people believe it's effecting the economy. From the article: "This has led to mathematics at university being compromised and able-students being...

How much mass does the sun lose every year?

ultra sensitive microphone or technique for listening to inner ear A friend has very loud tinnitus. He says it is constantly louder than anything else he can hear. Nothing can be heard by an independant observer such as myself, but it is possible that a sound with a small power level is so...

Hi everyone, I have the following problem. I saved a file and when I was going to open it, it didn't have the changes I made to it, it was a completely different file. Does anyone know what might have happened and if there's a way to retrieve it? I use Microsoft Word 2003 Thank you, John

This was in Japan, if the bird was a U.S. citizen it could run for congress.:biggrin: http://www.foxnews.com/story/0,2933,356850,00.html

A sinusoidal wave is traveling on a string with speed 10.00 cm/s. The displacement of the particles of the string at x = 20 cm is found to vary with time according to the equation y = (5.0 cm) sin[16.0 - (8.0 s-1)t]. The linear density of the string is 7.0 g/cm. (a) What is the frequency of the...

Homework Statement http://img508.imageshack.us/img508/9121/10052008ei3.png (a) Calculate the Current across parallel resistors. (b) Calculate the lost volt across parallel resistors. (c) Calculate the potential difference across parallel resistors. Homework Equations I = \frac{V}{R}...

Homework Statement An outfielder throws a baseball with an initial speed of 71.0 mi/h. Just before an infielder catches the ball at the same level, its speed is 85 ft/s. How much of the ball's mechanical energy is dissipated by air drag? (The weight of a baseball is 9 oz.) Answer is asked for...

integral (2x^2+3)^2dx=?

Homework Statement A 1200-kg car traveling initially with a speed of 25 m/s in an easterly direction crashes into the rear end of a 9000-kg truck moving in the same direction at 20 m/s. The velocity of the car right after the collision is 18 m/s to the east. (a) What is the velocity of...

Homework Statement Help I have spent a couple of days on this one and I am lost... What would the force constant be for a 75.0 cm length of 16-gauge (dia=1.291mm) copper wire? Y copper=11x10^10 Pa The answer being in Nm. The problem is I don’t even know where or how to approach this...

Homework Statement the problem is: A 3.0 m diameter merry go round with rotational inertia 120kgm^2 is spinning freely at 0.50 rev/s. Four 25kg children sit suddenly on the edge of the merry go round. a) Find th new angular speed, and b) detrmine the total energy lost to friction between the...

Homework Statement I'm working on the last section of the last chapter (11.9 The Higgs Mechanism) of Griffith's book on Elementary Particles. In Problem 11.25 I'm asked to derive the lagrangian that he gets juts after gauging [Eq. 11.131]. That's the one with a Goldstone boson and a strange...

These were review problems for the test I have tomorrow. My teacher was not present the day these were given, so I could not ask him for help. The answers were given for these problems, but in terms of getting to these answers, I am totally lost. Can someone please explain to me how to...

Homework Statement A spool of thin wire (with inner radius r = 0.40 m, outer radius R = 0.55 m, and moment of inertia I_cm = 0.7139 kg*m^2) pivots on a shaft. The wire is pulled down by a mass M = 1.350 kg. After falling a distance D = 0.550 m, starting from rest, the mass has a speed of v =...

Homework Statement http://img525.imageshack.us/img525/2069/spheressw9.jpg At the initial picture, we have two spheres, such that, the first one has charge Q, and the second one has no charge. Then we connect these two spheres with a conducting wire and let some Q flow through the...

Homework Statement A ball of mass m = 56 g is shot with speed vi = 20 m/s (in the negative direction of an x axis) into the barrel of a spring gun of mass M = 222 g initially at rest on a frictionless surface. The ball sticks in the barrel at the point of maximum compression of the spring...

Any 'Lost' fans on PhysicsForums? Any 'Lost' haters? Prediction on the plot for the fourth season? here a http://www.youtube.com/watch?v=0ou7cWOTXJs"

Wtf do these guys want? http://www.nytimes.com/2008/01/15/science/15brain.html?_r=2&8dpc&oref=slogin&oref=slogin

I haven't thought of physics since I was in college about 10 years ago (I am a biologist today). For some reason, however, last night when I was lying in bed I started thinking about general relativity. My mind settled on a question that caused me to loose several hours of sleep, and I don't...

Here's the quick story... I'm 23, and went to work full-time after graduating high-school. (Mistake, I know). Part of me thought of becoming a pilot, and in fact I did at least earn my private certificate this past summer. But, the way flying is, it's a long road financially, and once you...

I'm currently 18 years old..19 febuary. I graduated from high school last year, and I'm currently just working and trying to sort out my life. I'm living in Alberta, Canada...but I was born and lived in the US for the first 10 years of my life. My parents were born in Canada so I am a dual...

Homework Statement How many J of energy must be removed when 145.0 g of steam, at a temperature of 188.0°C, is cooled and frozen into 145.0 g of ice at 0°C? Take the specific heat of steam to be 2.1 kJ/(kg·K). Homework Equations Q=m*L The Attempt at a Solution Energy =...

Homework Statement Evaluate lim x\rightarrow infinity of (\frac{x}{x+1})^{}x, state explicitly the type of the indeterminate form. Homework Equations The Attempt at a Solution I somewhat understand how to use l'Hospital's rule when the form is 0/0, but the inf/inf throws me off...

Im so lost in Statics :( :( HELP! first of all i need to say that i do not go to a school that is known for its sciences. this of course means that we have crappy science teachers because our budget is very low. my teacher is horrible at explaining the material and whenever i ask him a...

My notes don't provide an equation. I am given inital and final velocity Vi=50 m/s Vf=25 m/s Thanks.

I lost my calculaor :( Plz calculate this for me! \alpha=53.0^{o} g=9.81\frac{m}{s^{2}} x=40.0m y=- 15.0m v_{0}=\frac{x}{cos{\alpha}}\sqrt{\frac{g}{x\tan{\alpha}-y}} thanks!

Some call them boots, they are the pull on type that come above the ankle, these ones were my most comfortable ones i could wear them all day, they must be 10 yrs old and still looked as good as new, well no more because they have gone vanished, i know i am a bit nutty, but to loose my boots is...

Ok, I'm trying to recreate some results from a paper, and I am really lacking in understanding. I'm getting extremely frustrated. I'll try to create a similar problem that replicates the original problem. The original problem, is three coupled non-linear differential equations that must be...

I have an integral I want to work out that should be a simple one but I just can't see where to start with it. Any help would be appreciated. \int\frac{lnx}{x-8xln^2x}

A generating station is producing 1.4e6 W of power that is to be sent to a small town located 7.0 km away. Each of the two wires that comprise the transmission line has a resistance per kilometer of length of 5.0e-2 \Omega/km. (a) Find the power lost in heating the wires if the power is...

integration--im lost Homework Statement how do you integrate this one \int sint cosnt dti tried using this identity 1/2 [sin(t-nt) + sin (t-nt)] then i got stuck so i used another identity again sin (t^{+}_{-}nt )= sintcosnt^{+}_{-}costsinnt the result is the original equation.. to sum it...

If the universe as a whole is moving at great speeds and spaces is a mostly vacant vacuum why aren't space shuttles lost when they brake free of gravity?

First, here is the question: The percentage of two elements making up an alloy can be estimated from the following equations, which assume a simple mixing of the two components: Palloy=F1P1+F2P2 F1+F2=1 Here, F1 is the fraction of the alloy composed of element 1, and F2 is the fraction...

i do not have a protractor with me and am very new to physics at the college level and have not gotten the book yet do to my student loans not bein processed and released at this time... PLEASE HELP the question on my homework i am having trouble with is as follows go 83.9 paces at 188...

Hi. Two days ago I posted two very, very interesting PDF documents on standard model, big-bang and current state of science: [crackpot link deleted] I can't find the post now in this forum, no "moved" parameter... nothing. It just seems to be deleted. I saw it posted the other day, and more...

A famous poet wrote a poem that I want to remember and read right now, but I can't :frown: I remember one line ends in "black daffodils." It might have been Walt Whitman, or somebody. Are there any suggestions to what I might be thinking about?

I'm 230lbs and I jump about 36 inches, if I were to lose 50lbs and get down to 180lbs and let's assume I don't lose any strength in my legs.. how would I calculate how much higher I would be able to jump. I wrote some stuff down and I got the jump would increase by the same percentage of %...

the impossible lost city "Mega". We have been there several times: https://www.physicsforums.com/showthread.php?t=6347 https://www.physicsforums.com/showthread.php?t=38797 https://www.physicsforums.com/showthread.php?t=86402 I have said on several occasions that something unexplanable...

Basic log question, completely lost! :( Homework Statement Prove that y = a(1+b)^t is equivalent to ln y = a+bt Homework Equations The Attempt at a Solution i'm really confused with how they could possibly be equal. y = a(1+b)^t t = ln y/ln a(1+b) ln y = t x ln (a+b) ln y...

Homework Statement curves with equation y=(4/x)+2 and y=ax^2+bx+c have the following properties: a) there is a common point at x=2 b)the is a common tangent line at x=2 c)both curves pass through point (1,6) thanks for help.

Question: Long-distance calling plan A offers a flat rate service at 10 cents per minute. Calling plan B charges 99 cents for every call under 20 minutes; for calls over 20 minutes, the charge is 99 cents for the first 20 minutes plus 10 cents for every additional minute. (Note that these plans...

Hello, I'm working on an assignment for class and I am lost on this question. problem A 5.0m ladder is with a mass of 10.0kg is leaning against a smooth wall at an angle of 25 degrees. The coefficient of friction between the ladder and the ground is .30. How far can a 65kg woman climb up the...

Remembering Virginia Tech's Shooting Victims http://www.npr.org/templates/story/story.php?storyId=9618673 Ross Alameddine Sophomore, English Major Age: 20 Christopher James Bishop German Instructor Age: 35 Brian Bluhm Graduate student working toward a master's degree in water...