Window Definition and 237 Threads

Homework Statement A bushranger hanging out of a hotel window wishes to drop vertically onto a horse galloping under the window. The constant speed of the horse is 14.0 m/s, and the distance from the window to the level of the saddle is 2.50 m. (a) What must be the horizontal distance between...

Hi! I've been solving problems that apply Bernoulli's equations in *reasonable* situations. One comes from Serway's book. It applies the equation for the force exerted on a window pane in a stormy day. They give us the speed of the wind blowing outside, the area of the window pane, the hint...

1. I produced a unit set function in MATLAB however my professor requires me to use a ramp function to be multiplied to a signal to filter out unnecessary parts of an earthquake chirp, this is being used in my project to determine whether the chirp was caused by a nuclear bomb. 2. ideally...

If you have a push out window the whole area is open but much of the wind is blocked depending on the angle. With a slide window you often have half the open area but you can get direct wind over 180 degree angle. Which one will cool the room down faster under which circumstance? If there is...

1. A rock is dropped off the top of a building. On the way down, the rock passes a window. The window is known to be tall and the stone takes 0.154 to fall past the window. 1. What is the velocity of the rock at the bottom of the window? 2. How much time was necessary from the instant the rock...

Homework Statement The modern Boeing 747 passenger jet airplane cruises at a speed up to 920 km/hr, at an altitude of 11,500 m. The cabin pressure is maintained equivalent to the atmospheric pressure at an altitude of 2,000 m. This is called the "cabin altitude". I couldn't find information...

Here is the question: Here is a link to the problem: A Norman window has the shape of a semicircle atop a rectangle so that the diameter of the semicircle is equal? - Yahoo! Answers I have posted a link there to this topic so that the OP can find my response.

I recently solved a question related to the problem below, but am having trouble getting an intuition for the problem. Suppose an automobile is traveling at a constant horizontal velocity, u, and it's raining. There is no wind, so the raindrops do not have an initial horizontal velocity, just...

Homework Statement A decorative window has the form of a rectangle surmounted by a semicircle whose diameter is equal to the top of the rectangle. If the TOTAL perimeter of the window 16+pi, then what is the maximum area? A. 25.653 B. 32.148 C. 15.923 D. 38.047 E. 30.018 Correct...

Hi all, I'm not quite sure if this is the right place to post my question, so forgive me if its not... I've written a program in Python that analyses data that I got from a compression experiment (mechanical testing of rocks and such), and I've written a piece of code that estimates the...

If room A is connected to the outside with a window and room A has a fan on; Would the air would try to move out from room A to the outside because there is a higher pressure inside the room? in concept

Homework Statement A ball is thrown vertically upward from a window at 10m/s. It hits the ground 5.0 seconds later. What is the height of the window from the ground? Given Vi = 10 m/s Vf = 0 Δt = 5.0 m/s Δa = -9.8 m/s^2 Find Δd(w-g) = ?Homework Equations Δd = Vi(Δt) + Δa(Δt)^2 And the...

I'm designing a vertical farm prototype and I'm trying to do some preliminary calculations to get an idea of how hot my crops are going to get. The basic design consists of a low-e glass (SHGC=.39) in the front and an aerogel panel in back(see attached diagram). I'm calculating for the hottest...

Homework Statement A roof tile falls from rest from the top of a building. An observer inside the building notices that it takes .20s for the tile to pass her window, whose height is 1.6m. How far above the top of the window is the roof? Homework Equations just having trouble...

A glass window 1m x 2m and .005m thick has thermal conductivity of 1.4W/m K. Inner surface temp of 15C and outside of -20C, what is the heat loss through the glass. double paned construction two panes separated by .01m, if glass surfaces are 10C and -15C, with air thermal conductivity of...

Help Derivatives ASAP -- maximizing sunlight through a window 3. The amount of daylight a particular location on Earth receives on a given day of the year can be modeled by a sinusoidal function. The amount of daylight that Windsor, Ontario will experience in 2007 can be modeled by the function...

Light gets dispersed into different colors in a window glass, just like in a glass prism, but the different colors exit the glass at the same angle. We can't see this phenomenon in a glass window because the distance between the different color lightrays is too small for our eyes to detect, or...

All, I have a button panel (code below) where a pressed button initiates a particular Mathematica script. When the button is pressed the script runs (as it should) but the panel closes. I wish for the panel to remain open so that I can click another button. The panel should close only when...

Fog condensed on a glass window is just a very thin layer of water droplets, so why is it so opaque to light? Normally light passes through a water-glass interface just fine, but why not in the case of condensation?

Hello Everyone, Actually my question is related to Window Fourier transform (WFT). I have studied that with the help of WFT we can easily determine the phase of the image. Like by multiplying the window to only a specific part of the input and considering the outside part of the window equals...

Hello! Somewhat trivial question: When I open a pdf of a journal, it opens in a new window on the web browser (Opera). When I go to open a second article; sometimes when clicking on download pdf, sometimes when pressing "Go" in SFX Ex Libris, it replaces the other pdf. Sometimes I can...

As I was sitting at work the other day productively watching an aeroplane fly across the window I started to think of this problem. If I measure the time it takes for the image of the plane to track across a known distance on the window I can quickly calculate a speed at which the image is...

Hi all As far as I know Hanning window is defined as the following: .5+.5*cos(2*pi*n/N) and n is between [-(N-1)/2,(N-1)/2] here N is odd number. MATLAB functions "hanning" with symetric or periodic options or "hann" do not match with the results of the above formula. There is always a...

I am only partially computer literate. I wish to be able to learn to code Fortran 2008? What and where do I need to download free or buy to make this happen. I have searched but get confused with not enough basic detail, like goto ... and hit ... Anyone, thanks, mark

Dear Fellows, I purchased a new Laptop with window in it, for activation of that window I gave that laptop to a IT department, that stupid person deleted the orginal window and made partitioning of Laptop from C to C, D, E, F. and installed XP instead of Window 7 . Can I take my...

I know x86 and Cortex are completely different but... is there any possibility for this to happen? May be a little code work to provide emulated interfaces?

HI ALL! :smile: Recently in class, we were assigned to find a video that presented an impossible situation and we had to calculate if the situation was even possible. My video was about a window washer that plunged 47 Floors. I've posted my calculations and information on it on my page...

this is my program but this is not working well.according to me a window should be created and some text will be written there.but the window is not working please can anyone tell me why?and how can i eject this error. mind that compiler is running the program correctly.. C Syntax (Toggle...

For the Bartlett window below: w(t)=1-|t|/u for -u<t<u w(t)=0 otherwise the books say that the Fourier transform of it is W(f)=1/u*(sin(∏*f*u)/(pi*f)) I use symbolic toolbox of MATLAB and can find the transform of a rectangular window. But I couldn't find it in case of...

Recently I read an article in the newspaper (yes, someone still reads them) of someone who committed suicide by jumping out a window of a 7 story building. That got me to wondering how much "force" he experienced at the moment of impact. (I don't know if force is the metric I'm looking for...

Homework Statement I think I know how to do this but wanted to make sure before I actually make the circuit. Here's a general diagram: [PLAIN]http://forum.allaboutcircuits.com/image_cache/httphome.cogeco.ca~rpaisley4ComparatorWindow.GIF So as you can see I'm trying to make a window...

Hello guys :) I'm applying a window function to a signal before using a Fourier transform on it, but the problem is that the Fourier transform's amplitude (RMS or Volt/Sqrt(Hz)) is changing. Some windows are normalised to retain the amplitude. I'm making sure this is happening by Fourier...

Hi, Everyone: I hope this is not off-topic; I apologize otherwise. Just went through hurricane Irene; luckily nothing major happened. Just curious, tho, about the issue of windows, and how to prevent them from breaking; I guess this has to see with the pressure difference...

if i can ask this any way of downloading window 7 for free well windows vista and i don't get along

Today when i was traveling in train(from my study center to home) i found a common but unexplained thing that is a little reflection can be seen on Glass window of train when it is underground or there is any wall behind the windows BUT when there is no window(ex when it is in station there is a...

I was on a plane the other day and it was bright outside so I put on my sunglasses and looked outside and saw a spectrum of colors. Just looking through the window or just looking through the glasses didn't produce the colors. Any idea what's going on?

Hello everyone, I have a practical problem I am looking to solve. In my tiny 300 sq ft apartment in NYC I have 3 windows with exposure to the East, West, and South. It is very hot. I just purchased an 8000 BTU window unit, so in which window will the unit operate with the most efficiency...

Homework Statement a window washer weighing 271.8N is standing on a scaffold by a vertical rope at each end. the scaffold weighs 265.6N and is 4.452m long. what is the force in each rope when the window washer stands 1.48m from one end. Homework Equations 1/2(m1+1/2 m2)Vf^2 The...

Homework Statement A lamp producing 1600 lumens is 16" away from a window of 0.015m^2 on a wall 0.14m^2, what is the amount of light through the window. Homework Equations lux = lumens/m^2 The Attempt at a Solution Since there's no material in the window, shouldn't it be the full...

Do wooden wall or window glass give good protection from penetrating radiation such as gamma rays?

Homework Statement At a marine animal park, Alison is looking through a glass window and watching dolphins swim underwater. If the dolphin is swimming directly toward her at 15 m/s, how fast does the dolphin appear to be moving? Homework Equations v=15 m/s I realize that due to the...

Hi I'm having trouble with my injury mechanics problem where a rigid window with frame falls from a verticle position on a person sitting below. Homework Statement The decorative wood-framed window below has been inadvertently left unrestrained in a nominally stable vertical position...

So, yesterday I was alone at home standing in the kitchen reading a paper when I heard a loud, sharp sound, as if something felt on the floor. I checked all rooms and attic looking for what it could be, but there wasn't anything. We don't have animals, neither our own or visiting, so I could not...

Homework Statement A 100W lightbulb connected to a 120V source experiences a voltage surge that produces 140V for a moment. By what percentage does its power output increase? Assume its resistance does not change The Attempt at a Solution (1) P_0 = C\Delta V_0 ^2 (2) P = C\Delta V^2 Note...

Hi, I'm considering buying a home on a hill that has a cellular tower a eye level with the kitchen room window. The antennas (6) are about 30 feet from the window. The antennas for the most part are directed outward toward the valley. Does this pose a potential health problem? I'd...

Does anyone have a suggestion on how to set up a virtual window in a windowless room (or office or shop)? Google search came up with some kind of Apple or Wii set-up, has anyone tried it? Have comments on it? Does anyone have other suggestions? [Mod: please feel free to move under Tech or...

Everyone who lives in a region that gets cold knows that if you exhale onto a window, the water vapor in your breath condenses onto the surface. Because the air is dry, this condensation evaporates. What puzzles me about it is why it does so from the edge of the fogged region to the center, as...

Does anyone know of a material, similar to Plexi Glass, that could be used for a window but does not absorb UV light? Regular glass won't work, I am looking for something that will not easily shatter.

Homework Statement Consider a double-paned window consisting of two panes of glass, each with a thickness of 0.500 cm and an area of 0.745 m2, separated by a layer of air with a thickness of 1.95 cm. The temperature on one side of the window is 0.00°C; the temperature on the other side is...

Dear Physics gurus- I have a question which I believe will be rather simple for one of your to help explain to me. Not coming from much of a scientific background, I’m looking for a conclusive technical explanation of the following question which I debated at some great length with my...