A window is an opening in a wall, door, roof, or vehicle that allows the passage of light and may also allow the passage of sound and sometimes air. Modern windows are usually glazed or covered in some other transparent or translucent material, a sash set in a frame in the opening; the sash and frame are also referred to as a window. Many glazed windows may be opened, to allow ventilation, or closed, to exclude inclement weather. Windows may have a latch or similar mechanism to lock the window shut or to hold it open by various amounts.
In addition to this, many modern day windows may have a window screen or mesh (often made of aluminum or fibreglass) to keep bugs or insects out when the window is opened.
Types include the eyebrow window, fixed windows, hexagonal windows, single-hung, and double-hung sash windows, horizontal sliding sash windows, casement windows, awning windows, hopper windows, tilt, and slide windows (often door-sized), tilt and turn windows, transom windows, sidelight windows, jalousie or louvered windows, clerestory windows, lancet windows, skylights, roof windows, roof lanterns, bay windows, oriel windows, thermal, or Diocletian, windows, picture windows, Rose windows, emergency exit windows, stained glass windows, French windows, panel windows, double/triple-paned windows, and witch windows.
The Romans were the first known to use glass for windows, a technology likely first produced in Roman Egypt, in Alexandria ca. 100 AD. Paper windows were economical and widely used in ancient China, Korea, and Japan. In England, glass became common in the windows of ordinary homes only in the early 17th century whereas windows made up of panes of flattened animal horn were used as early as the 14th century. In the 19th century American west, greased paper windows came to be used by itinerant groups. Modern-style floor-to-ceiling windows became possible only after the industrial plate glass making processes were fully perfected.
I was given 2 problems based on statics and I was wondering if anyone could help.
Thank you - we just learned the concepts of statics TODAY and were given an assignment immediately, so any help would be appreciated.
A window washer attempts to lean a ladder against a frictionless wall...
Homework Statement
A Norman window has the shape of a rectangle surmounted by a semicircle of diameter equal to the width of the rectangle. If the perimeter of the window is 20 feet, what dimensions will admit the most light (maximize the area)...
Homework Statement
A window has the shape of a rectangle surmounted by an equilateral triangle. Given that the perimeter of the window is 15 feet, express the area as a function of the length of one side of the equilateral triangle.
Homework Equations
Area of an equaliteral triangle ...
Homework Statement
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. Take down to be the positive direction, so that downward velocities are positive and the acceleration due to gravity is the...
Im not sure what this is:
http://www.dumpert.nl/mediabase/1092641/c3edd207/curious_stroboscopic_effect.html
Maybe this is an explanation for some sightings seen by airplane passengers.
Or maybe it is an artifact of a bad videocamera and you wouldn't see it with the naked eye.
Is this method good for analyzing a pulse?
Why is the averaging of the spectra good for noise cleaning?
What's the criteria for defining how much windows in a set of data one should take?
Anyone who clarifies this has a big thanks from me.
I have been creating simple programs from the hello world one to simple math and loops - all of a sudden when I went to practice more today my programs would be completed but the window showing the result would pop up and almost instantaneously close itself - in the end I can't see the result...
Homework Statement
A glass windowpane in a home is 0.62 cm thick and has dimensions of 1.0 m x 2.0 m. On a certain day, the indoor temperature is 25˚C and the outdoor temperature is 0˚C.
a) What is the rate at which energy is transferred by heat through the glass?
b) How much energy is lost...
Do any of you design engineers or informed laymen know why progressive tint window glass like that found in eyeglasses is not offered as an option? Aftermarket provides tinted glass but not progressive tinting.
I must wear tinted glasses outdoors due to light sensitivity so I wear progressive...
Homework Statement
a gothic window it to be built with 6 segments that total 6m in length. The window must fit inside an area that is 1m wide and 3 meters tall. the triangle on top must be equilateral. What is the maximum area of the window.
Homework Equations
The Attempt at a...
http://yahoo-ans.com/U37HySkeeghwAMrrjT7Ix5XNG_ylv3qid20100228182319AAg_nhakhoa_SQr5/
i tried it all i think but a lot that's online right now only seems to work on XP not vista
well this is what i tried so far you tell me what to do know! here my list of failures lol...
i went to...
SoRry But I Have An a PrOblem To start WIth this...
A boy is at a distance d = 6m from the base of a building attempts to throw a ball through a window size that H = 90cm at a height h = 8m.
if the ball's initial speed is v0 = 15m / s,
determine the range of initial angles Ø0 allowing the...
Homework Statement
So there's a double pane window, where between two identical sheets of glass is air. So on the outer surface side, there 3mm of glass, then 9mm of air, and then another 3mm of glass. Outside temp is 50 degrees C and inside temp is 25 degrees C.
Heat of conductivity for...
Homework Statement
*See attached diagram*
On straight, level, parallel tracks separated by a distance d,
two trains are testing their horns (in still air of density ρair).
The horns (located at the train fronts) emit equal frequencies.
Horn 1 is a pipe, open at one end, emitting a total power...
Vacuum Physics?
I would like some clarity on a problem I think is attributed to a vacuum space. This is what happened...I have a small room that is 7' x 10', there are two metal doors directly across from each other on opposites sides of the room. It seems that when I want to close the door...
Hi. i wrote a script that finds the definite integral of a function using simpsons rule.
right now the function to be integrated is defined as 2*pow(9-pow(x,2),.5).
but this is very inconvenient to me because i must edit the program each time i want to find a new integral. my question is how...
Homework Statement
a research submarine has a 20 cm diameter window 8 cm think. the manufacturer says the window van withstand forces up to 1x106N. What is the submarine's maximum safe depth?
Homework Equations
p = po + \rhogd
The Attempt at a Solution
p = F/A = 1X106 / 0.03 =...
Homework Statement
In a sticitly scientific experiment, a student athlete throws rocks out the window in all directions. All rocks have the same initial speed V. It turns out that all rocks' landing velocities make angles theta or greater with the horizontal. Find height h of the window above...
Homework Statement
http://www.cramster.com/physics-answers-5-653651-cpi0.aspx
Homework Equations
F=ma
The Attempt at a Solution
I tried seven times and all my entrys have been wrong. Please help me.
[b]1. A pumpkin is launched into a window. There is a hedge that is 8m high and 10m from the window. THe window is 1m in height and 1 m from the ground. THe pumpkin is .75m from the ground at initial position.
a) Find the initial launch angle and velocity to clear the hedge and make it into...
1. Homework Statement
A research submarine has a 40.0 -diameter window 8.30 thick. The manufacturer says the window can withstand forces up to 1.00×106 . What is the submarine's maximum safe depth?
2. Homework Equations
p=Po + pgh3. The Attempt at a Solution
p = 1.01x 10^5 + ? X9.8 x 8.3
i...
Homework Statement
A window washer of mass M is sitting on a platform suspended by a system of cables and pulleys as shown . He is pulling on the cable with a force of magnitude F. The cables and pulleys are ideal (massless and frictionless), and the platform has negligible mass.Find the...
Hello there!
It's been about a grillion degrees up here in my home town recently and last night this led me to a sort of conundrum. If I open the window in my room but leave my door shut, hardly any air comes it at all. If I open my door, there's a strong puff of wind that comes into the room...
Hello there!
It's been about a grillion degrees up here in my home town recently and last night this led me to a sort of conundrum. If I open the window in my room but leave my door shut, hardly any air comes it at all. If I open my door, there's a strong puff of wind that comes into the room...
Out the window
Interpret as you will
Contest Rules:
1. Any digital photo or digitally-scanned photo relevant to the theme will be accepted within the contest period. In case there's a gray area, or you're not sure if the picture is suitable, check with me first.
2. Please resize your...
opening up a window - sequence of operations!
hi, i just need a list of what i need to do to open up a window. approx 6 metres long by 3 metres deep. i know that struts, needles, dead shores and bracing etc is involved, i just need help putting a full list in order. this is what i have so far:-...
I am having a problem understanding the window detector ckt using a high precision comparator LM1414. Suppose Vut =7,Vlt=2 and if Vin=8,then C1 will be negatively saturated & C2 will be positively saturated , when I think both should be negatively saturated.
Searching on the net I came...
Homework Statement
Sounds like the beginning to a bad joke right?
Two long straight wires pass through a window frame (1m x 1.5m). One wire carries 1A out of the room and one wire carries 8A in. Find magnitude of closed integral of vector B * vector dl around window frame.
Answer in...
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 Lw. Take down to be the positive direction, so that downward velocities are positive and the acceleration due to gravity is the positive quantity g...
1. A boy can throw a stone at 14 m/s. At what angle must he throw it in order to hit a window which is 10m away horizontally and 5m above the ground?
2. I would assume we have to use trig ratios and the kinematics equations.
v = u + a.t
v^2 = u^2 + 2.a.s
s = u.t + 1/2.a.t^2
3. Diagram:
(see...
Homework Statement
A window washer of mass M is sitting on a platform suspended by a system of cables and pulleys as shown. He is pulling on the cable with a force of magnitude F. The cables and pulleys are ideal (massless and frictionless), and the platform has negligible mass.
Homework...
A window cleaner of mass 95 Kg places a 22 KG ladder against a frictionless wall, at an angle 65 degrees with the horizontal. The ladder is 10 m long and rests on a wet floor with a coefficient of static friction equal to 0.40 What is the maximum length that the window cleaner can climb before...
Homework Statement
a norman window has the shape of a rectangle surmounted by a semicircle. A norman window with the perimeter 30 ft. is to be constructed.
a.) find a function that models the area of the window.
b.) find the dimensions of the window that admit the greatest amount of light...
I live in a studio apartment over a busy city street. About 99% of people who walk by stare into my apartment and focus on me. I've been pretty good at ignoring this, but after a year, it's taking a toll. About an hour ago, some guy was standing out there with his wife/gf, and pointed at me over...
This is a problem from Halliday, Resnick, and Walker. My solution gets the correct answer, but it seems very extremely complicated and I think there is an easier way to do it.
Homework Statement
A cat spots a flowerpot that sails first up and then down past an open window. The pot is in...
I'm trying to get some software working to automatically download podcasts to my girlfriend's PC. The problem is that the window for setting options is too big, so not all of it is accessible. In particular, the "OK" button is off the screen, so I can't save the options. D'oh! I've been...
Hi all,
I am currently looking into the energy correction factor of the Hann window.
So far I have found that to correct for the application of Hann-window and Fourier transform the result needs to be multiplied by sqrt(32)/sqrt(3).
Can any of you explain how to get that factor ?
The...
http://img409.imageshack.us/img409/4825/sdfsbe9.jpg
i am getting this error when i simulated the above circuit
what could be wrong
**** CIRCUIT DESCRIPTION
******************************************************************************
** Creating circuit file...
I've searched this sight but to no avail. I am wondering how can i implement printing capabilty in my MFC dialog window. I've tried creating a SDI with the CFormView Class, but there is no printing support that way. If I try to make a Dialog-Based Application the "Standard Toolbar" option cannot...
Here's a java applet that shows the electric field of a moving charge (it's actually incorrect, it only gives a rough idea how motion and acceleration affect electric field).
http://www.cco.caltech.edu/~phys1/java/phys1/MovingCharge/MovingCharge.html
Can a java applet like this be the same...
Homework Statement
I am doing a piece of work on potentiometers/potential dividers and i need to design a sensor circuit to detect 60 degrees of movement of a greenhouse window. I then need to be able to see the position of this window on an analogue display (this is a 5V voltmeter with a...
Homework Statement
A window washer pulls herself up using a pulley-bucket apparatus. How hard must she pull downward to raise herself slowly at constant speed? The mass of the person plus the bucket is 75 kg.
Homework Equations
F=ma
The Attempt at a Solution
I don't know what I'm...
Homework Statement
An airplane is flying at an elevation of 12500 m. The window on an airplane is a square of length 0.115 m on each side. What is the net force on the window?
Homework Equations
P = Po + pgh
p = 1.26 kg/m^3
Pair = 101.3 kPa
The Attempt at a Solution
I thought...
I've got two equations that i want to put into a matrix and solve for Va and Vb:
1.7ma = (1/5k + 1/20k) -1/20k Va
-2ma = -1/20k (1/4k + 1/20k) Vb
The answers I got were Va= 5.655v and Vb= -5.724
then, using I= (Vb-Va)/R ----> (-11.379/20k) = 0.65ma...
I'm doing research on window functions (such as: rectangular, Hanning, Blackman, etc), but am having trouble with respect to the energy loss associated with each. I know that applying the window causes energy loss in the spectra of interest, and for the Hanning Window and Hamming window...
I'm doing research on window functions (such as: rectangular, Hanning, Blackman, etc), but am having trouble with respect to the energy loss associated with each. I know that applying the window causes energy loss in the spectra of interest, and for the Hanning Window and Hamming window...
Ok this might be a simple problem but i have no idea how to do it;
A stone is dropped from a window 5m high what is its speed when it hits the ground.
I don't need answer i just need a formula or some guidence
Thanks