Window Definition and 237 Threads

Can a uniform diffraction grating (a window screen) alone focus objects (bricks on a building beyond) so that a nearsighted observer (I) can better image them?

A helicopter is moving with some velocity in upward direction,a packet is dropped from the window of the helicopter.why the packet goes upward after dropping?What will be the velocity of the packet ?is its velocity is same as the helicopter?why,why?please explain.

Suppose a fan was positioned to blow air out of a window so that window fit well around the fan. Why would this cool off a room?

hey, is it possible, that when you throw a piece of a newspaper true the window of a train, the paper enters back at the following window ? thx laurens

I have an idea for a physics demonstration, but i am unsure if it will work. Here it is. Aim: To change the refractive index of a small model window using electricity. Materials: 25g KPD (Kerr Medium) watered down and inserted between 2 glass panels. Electrodes placed above and below...

Does anyone know how ordinary window glass behaves at different wavelengths? It obviously passes the optical band, but does it pass ultra violet and infrared wavelengths equally well? How about wavelengths above 1000nm? Below 250nm?

I was in a car on a rainy day and saw that the drops on the window were sliding down the window at about 45 deg. , I guess that that means that the force of the wind on the raindrops is about equal to the gravitational force but is that enough to calculate the speed of the car?

A thermal window with an area of 6.00 m2 is constructed of two layers of glass, each 4.00 mm thick and separated from each other by an air space of 3.00 mm. If the inside is at 20.0°C and the outside is at -38.0°C, what is the rate of energy transfer by conduction through the window? i am...

Hey Guys, I managed to just scavenge this site from google and am in need for some assitance with this problem, which i think is very straightfoward but not sure how to approach it. A rectangular window surmounted by an equilateral triangle has a perimeter of 12ft, find the dimensions of...

Something I've been wondering lately is how much energy (or well, speed really) an object loses if it smashes through something (like glass). I was thinking if you knew the Young's modulus and the dimensions of the "something", you could use the integral of the F * dx. Then i realized Young's...

remember "IE only opens one window at a time?" ya, i had a thread like that a few months ago, that went horribly off topic, (discussions of why i should get rid of IE and switch to firefox or whatever...) anyway, problem hasn't been fixed... matter of fact.. its worse. now, if i want to...

Do photons in the form of visible light actually pass through ordinary window glass? I ask because window glass is assumed to be opaque to photons in the form of infrared energy. The IR photons are accepted on one side of the glass, conduct through the body of the glass in the form of heat...

Ok, without criticism can we all just accept for argument sake a Newtonian spacetime? That is - without relativity. Ok, I'm going to try to describe something that I thought of a long time ago (considering time travel when I knew not of relativity). If information travels through light...

http://www.spacedaily.com/news/tourism-05p.html

A single glazed window of area 3m^2 transmits 400W when there is a temperature difference of 15C across the glass, What is the U-value of the glass?? Help me, how do i work this out?

How does one obtain for one's own site avatars similar to those which appear in some address windows? For PF the avatar appears as a "check" in a square yellow field.

So, i can't click on any links right now, or open an new window, because when i do that, my original window closes. (like in JimmyP's bday thread...) So, i don't know why... or what's going on. Help?

We have to to a report in our chemisty class on heating houses. One aspect is the window. Our teacher says that good windows are filled with argon becuase they have a high specific heat. but looking on the internet I seem to find the specific heat of argon to be about 520 J/kgC which is...

Under Linux, is there any way to make a window with menu bar ? 10q Nikunotare

What is the difference between a desktop environment and a windows manager? Why do I need them both?

A scaffold of mass 68 kg and length 6.1 m is supported in a horizontal position by one vertical cable at each end. A window washer of mass 77 kg stands at a point 1.7 m from one end. What is the tension in the cable closer to the painter? What is the tension in the cable further from the...

I need to implement a sort of "framebuffer in a window" for a digital video application I'm working on. I need the window to be displayed alongside other windows (running Windows XP) and get along nicely with other windows on the desktop. The window will display the pixel data in an arbitrary...

Force of Brick on Window Ok, I figured i'd had this question sussed but it doesn't seem so now that I know the answer. So, I know the answer, but I want to know why it's that way. A thrown brick hits a window, breaking the glass, and ends up on the floor inside the room. Even though the...

Ok, I tried this and even found on this forum that someone asked the same question before, but I tried their advice and the answer was still wrong. The problem is that : ---- A window washer pulls herself upward using the bucket-pulley apparatus ...How hard must she pull downward to raise...

A window shade of mass M, thickness W and length L is driven by a linear spring having tension T (with shade unfurled) and tension 0 (with shade rolled up). The solid cylinder upon which the shade winds has radius R and mass m. What is the time elapsed for the shade to roll up completely when...

As you look out of your dorm window, a flower pot suddenly falls past. The pot is visible for a time t, and the vertical length of your window is L_w. Take down to be the positive direction, so that downward velocities are positive and the acceleration due to gravity is the positive quantity g...

Can dream experience's from our Parents/Ancestors lives, be passed on via Genetic hereditary? For instance, can some of my most bizarre dreams, actually be a replay of one of my ancestors life-experience..event? The Timeline of experience (events), played out in my dreams seem to have no...

This guy may someday get a Darwin Award. SALT LAKE CITY - Two men planning to throw lighted fireworks from a car were burned when they forgot to roll down the window. "They lit a large mortar rocket firework" and were going to throw it out the window, Salt Lake County sheriff's Sgt...

I have this fluids problem I've been working on for a while, but I can't seem to get the correct answer. The problem is: A circular window with radius 25 cm in a submarine can withstand a maximum force of 1.23E6 N. If the interior of the submarine is maintained at a pressure of 1 atm...

I know a prisim can be used to disperse white light into colors. This does not happen when a beam of light passes through a window pane.Why not?( the light may or may not be entering the glass window along the normal. The light does not disperse into colors). thanks

Euclid's Window, by Leonard Mlodinow, is the best layman text, that touches on the deepest issues of modern mathematics and theoretical physics, that I've ever read. Through use of excellent analogies and some humor, Mlodinow takes the reader through the history of geometry (from the ancient...

if an alone black hole is radiating gamma rays that's called hawking radiation that means its losing energy (because gamma rays aren't matter) but whatever size it is it dosen't lose energy that's why black holes go faster and faster the smaller it gets. Here is two main components why i say...

I can so totally see the aurora borealis from my window. I've never seen it before. It's so cool. I think I'm going to get my guitar and go outside and play... its cold, but i always play for the full moon, figure the lights are just as special. Sooooo Cool...

A window washer pulls herself upward using a bucket-pulley apparatus. How hard must she pull downward to raise herself slowly at constant speed? If she increases this force by 10% what will her acceleration be? The mass of the person and bucket is 65 kg. Need some help, gracias.

Someone wrote me PM asking about the pedagogical merit and scientific validity of three papers by Rainer Zimmermann (Philosophy of Science, some connections to Cambridge and Uni Kassel) I cannot judge on my own, but must throw the question open. The three papers are...

Why is the top of this window appearing at the bottom of the screen? Am I being HACKED! OMG I can't move the window and there isn't anything but the normal spyware that the cable company installs in the task manager. Does anyone know how to force a window to move or how I might link this...

How does the flow of thermal energy through a closed window illustrate the second law of thermodynamics? Which direction is the flow when it is cold outside? How outside? --Please note this is a textbook question I can't seem to answer.