A watch is a portable timepiece intended to be carried or worn by a person. It is designed to keep a consistent movement despite the motions caused by the person's activities. A wristwatch is designed to be worn around the wrist, attached by a watch strap or other type of bracelet, including metal bands, leather straps, or any other kind of bracelet. A pocket watch is designed for a person to carry in a pocket, often attached to a chain .
Watches were developed in the 17th century from spring-powered clocks, which appeared as early as the 14th century. During most of its history the watch was a mechanical device, driven by clockwork, powered by winding a mainspring, and keeping time with an oscillating balance wheel. These are called mechanical watches. In the 1960s the electronic quartz watch was invented, which was powered by a battery and kept time with a vibrating quartz crystal. By the 1980s the quartz watch had taken over most of the market from the mechanical watch. Historically, this is called the quartz revolution (also known as quartz crisis in Switzerland). Developments in the 2010s include smart watches, which are elaborate computer-like electronic devices designed to be worn on a wrist. They generally incorporate timekeeping functions, but these are only a small subset of the smartwatch's facilities.
In general, modern watches often display the day, date, month, and year. For mechanical watches, various extra features called "complications", such as moon-phase displays and the different types of tourbillon, are sometimes included. Most electronic quartz watches, on the other hand, include time-related features such as timers, chronographs and alarm functions. Furthermore, some modern watches (like smart watches) even incorporate calculators, GPS and Bluetooth technology or have heart-rate monitoring capabilities, and some of them use radio clock technology to regularly correct the time.
Most watches that are used mainly for timekeeping have quartz movements. However, expensive collectible watches, valued more for their elaborate craftsmanship, aesthetic appeal, and glamorous design than for simple timekeeping, often have traditional mechanical movements, despite being less accurate and more expensive than their electronic counterparts. As of 2018, the most expensive watch ever sold at auction was the Patek Philippe Henry Graves Supercomplication, the world's most complicated mechanical watch until 1989, fetching US$24 million (CHF 23,237,000) in Geneva on 11 November 2014. As of December 2019, the most expensive watch ever sold at auction (and wristwatch) was the Patek Philippe Grandmaster Chime Ref. 6300A-010, fetching US$31.19 million (CHF 31,000,000) in Geneva on 9 November 2019.
Homework Statement
The second hand on a watch has a length of 4.5mm and makes one revolution in 60s. What is the speed of the end of the second hand as it moves in uniform circular motion?
Homework Equations
ac=v^2/r
The Attempt at a Solution
ac=v^2/4.5
I'm really into a few series. My favorite show right now is Breaking Bad. Highly recommend it. The first few seasons of Dexter were amazing but the show has gone downhill. Also recently on BBC there has been the best version of Sherlock Holmes I have ever seen. Recommend as well Shameless and...
These could be shows that you liked to watch in about the
past 55+ years.
However, upon looking back, you find them to fall in some
combination of these categories/types:
a) too corny for your likes, b) outdated,
c) painful to watch, d) the canned laughter stands out too...
Hello,
I have purchased a Casio CMD-40B watch. It functions as a remote control for your TV and Cable boxes. How it works is, you look up the specific TV's "code", tell it to the watch, and your watch now acts as the TV's remote control.
Here is the Watch Manual...
Homework Statement
The minute hand on a watch is 2.0cm in length. What is the displacement vector of the tip of the minute hand from 8:00 am to 8:20 am?
It wants it in x and y components.
Homework Equations
I found this equation online- i(L sin 2pi(T/12)) + j ((L cos 2pi (T/12))...
Observed at Providence, Rhode Island:
05:30 UTC 28 August 2011: 29.68"Hg
05:45 UTC 28 August 2011: 29.67"Hg
06:00 UTC 28 August 2011: 29.68"Hg
06:15 UTC 28 August 2011: 29.70"Hg
06:30 UTC 28 August 2011: 29.71"Hg
06:45 UTC 28 August 2011: 29.70"Hg
07:00 UTC 28 August 2011: 29.67"Hg
07:15...
These are professor Balakrishnan's quantum physics lectures, he also has classical physics lectures, they're worth watching,, he's good..
Enjoy ^_''
Edit: These are not very introductory, for that you can see Susskind's Lectures, or something else you might find..
Just wanted to say the new Family Guy episode is brilliant! Episode is called The Big Bang Theory, even if you don't like family guy this episode is going to become a classic for anyone even remotely bothered about science.
Watch It!
Chris
In Norway, we have a peak year not only for lemmings, but also for Vipera Berus, the European adder/viper.
We also have dedicated snake lovers, like this woman, who enjoys having roughly 8 vipers outside her garden (her neighbours are rather annoyed that she doesn't kill them on sight).
On...
So I was watching Fringe this morning and this came up. Then the character ominously solved it with a zero. I could solve the integral but there is a symbol that appears in the beginning that I am not familiar with. Plus, with the emphasis on him solving it with zero, maybe this is a famous...
For anyone who does dangerous sports/activities.Don't watch this is you are easily upset, you know what is going to happen.
It happens at the end so you can safely watch the start and bail out.If this is considered inappropriate please remove it mods, but a warning has been given...
Kinda like "Being John Malkovitch" but not quite. My scenario deals with historical figures that are dead.
What if it were possible to relive someone elses life, watch it on a tv perhaps, AND hear their thoughts as they thought them...
We have Einstien's brain somewhere, right? If it were...
I wish he was alive, what a loss to humanity. At least his words still persist and shine hope for the future:
https://www.youtube.com/watch?v=j2oXFWKpJiA
what causes the light to bend in the following vidio?
http://www.youtube.com/watch?v=hBQ8fh_Fp04&playnext=1&list=PL993D6B3429F14C8A
i think its refraction.
Homework Statement
Calculate the angular velocity of the second, minute, and hour hand of a watch.
Homework Equations
Assuming the watch is functioning normally, a second hand must travel the entire 360 degrees in 60 second. The formula ω= ɵ/t would be used, where ω is angular velocity...
Really? I would think US users use it more...
http://ca.news.yahoo.com/canadians-surf-watch-youtube-consult-wikipedia-more-other-20101228-020009-784.html"
continued
How do they even get their data such as age demographics ? I hope they are not data-mining.
I've just rented the first season on DVD. I have never seen the show before and I don't know if I am going to be too squeamish to watch it. I like scary stuff, but not too gory. I could never watch the Saw movies, for example.
I've heard from friends that the Dexter plots are very good, and...
Hello forum,
I have a metal wrist watch made of stainless steel and titanium (I think) and I was wondering why it is sometimes warm and sometimes cold (or colder than my body temperature it even gets unconfortable). I was thinking, is there something like a threshold body temperature where the...
Watch out for that kid!...oh, nevermind
We've seen this kind of illusion before...they're really cool...
http://news.blogs.cnn.com/2010/09/09/3d-illusion-in-street-tries-to-change-drivers-attitudes/?hpt=C2
But is this really such a good idea, to desensitize drivers to kids in the...
The Department of Homeland Security has just issued a terror watch to law enforcement agencies in Texas. A Somali terrorist smuggler residing in Texas (how does that happen?) has been running a "large-scale smuggling operation" recently unsealed Federal court documents reveal. The...
My mind often wanders while driving, and since I had been reading a lot about watches one particular day, as well as having read an article on springs made of carbon nano-tubes, I thought it might be possible to power small electronic devices with a mechanical self-winding watch movement...
They say that when you go faster in space your watch would tick slower. How can the watch tick slower when the watch has a constant ticking rate determined by the gearratio?
(I do understand that the rate of time decreases as the velocity increases)
Watch my video...or else!
Some fellow students and myself recently entered a portable fuel cell competition for the international association for hydrogen energy. As part of this competition, we had to make a video presentation and put it on youtube. We are trying to get as many views and...
Homework Statement
Can anyone give me a hand on how to start this? I would attempt a solution but I've tried over and over and can't seem to get anywhere.
A man sets his watch at noon by the sound of a factory whistle 3 miles away. If the temperature of the air is 20-degrees C, how many...
The Northern Lights - aurora borealis - may be visible tonight south of the 45 parallel.
http://www.swpc.noaa.gov/pmap/gif/pmapN.gif
http://www.swpc.noaa.gov/pmap/pmapN.html
http://pirsa.org/10020079/
Great talk about cool results. Perimeter has videos of a lot of excellent valuable lectures on line but if you would only watch one, be sure it's this :biggrin:
My wife and I have a neighbor who seems to buy DVDs at whim, as does his wife. We have borrowed movies from them, only to find that many (most!?) are not worth watching. They have "chick flicks", "sci fi", and other "drive-in" fare in spades. but it is rare that we can borrow a movie from them...
http://www.cnn.com/2010/US/02/13/tacoma.recall/"
Things are not looking good at the Toyota plant. Even though it is only 8,000 trucks, each recall and warning hurts them more and more.
When I go to you tube to watch videos it says that I either have JavaScript turned off or an old version of Adobe's Flash Player.
But I have met both of those requirements and it still won't let me watch videos .
Does anyone know how to fix this or have any ideas ? Anything would be...
Hi, I'm taking Calculus II in the Spring and I'm wondering what you guys did to succeed in that class. I know it's different for each school, but in general, I've heard calc 2 was integration hell. Anyways, here are some topics that was listed in the Fall Calc 2 final review, what should I look...
I hear that calc II is the hardest course in the calculus sequence. I am not sure why this is, but it is something that I hear constantly. Why is it considered to be so difficult? Are there a lot of formulas or are there many different applications of formulas, ideas, and logic? Obviously people...
My family is pooling to get me a watch for my upcoming mid 20s bday, since I've never had one for long time. I've looked around different sites and have absolutely no idea which to get. There is too many choices, and I don't know what the trend is today. So just wondering if anyone here is...
If you are traveling away from Earth on a spaceship near the speed of light, it is well known that the moving clocks on the ship run slower relative to stationary clocks on earth.
I was wondering if while on the space ship, you could watch the news on TV and see events progress at a...
http://thehill.com/leading-the-news/conservative-group-sues-for-tarp-details-2009-02-16.html
Hopefully this will be informative.
The Obama administration has promised to put the second part of TARP on the web.
In theory, if you set up say a satellite camera pointed to a location in new york city, got in a space ship, turned on a tv with a live feed of the sim city like perspective of NYC, shot away going near the speed of light, would you start seeing time on Earth progressing faster and faster?
Anyone watch "House"?
I have a question. First let me say that I know it is TV. But, my question is this: In an episode that I watched today, the three main doctors besides House (I don't know their names...black guy, white guy white chick works) performed a surgery on a patient. Don't they...
I thought it was very refreshing alternative to tv programs that hyped up the presidential election and tv talk shows hosts that argue why there presidential candidate will make life easier for Americans. This special does a good job comparing the promises politicians actually make vs. the...
Omega
Breitling
Tag
Which one?
I am spoiling myself early this year. I will get a decent end of year bonus this year so it won't break my bank. Also, I don't buy nice watches to show off, I just like nice watches. They can complete a nice outfit.
TED.com, and watch "A Stroke of Insight"
I like being 1 with everything.
the easiest way that I have found to get there is through music.
most specifically, winamp 5.531/shoutcast/groovesalad
to help you understand.... go to TED.com, and watch "A Stroke of Insight"
Did anyone watch this tv show tonight? It had a scene about an immersion tank that reminded me of the William Hurt movie "Altered States". I will be back after Andrew Zimmern's season premiere with more, but here are a few clips from Altered States...
My days of watching football are almost gone, I used to watch it with friends while tailgating , however they have all gotten married and are either in medical or law school, yes all of us have gone our own separate ways; they've remained in Iowa while I moved to Georgia. Do we converse on the...
Watch NOVA on PBS tonight!
Hopefully, you'll get the same feed we are scheduled for, regarding cuttlefish, squids, etc. It's amazing what these critters can do!
My pc restarts everytime I watch a video after 5 minutes
(e.g. on youtube or if I watch a video with the windows media player) .
a) I've already done a memory test (the memtest ran for 6 hours
and didn't show any errors)
b) I formatted the hard drive and reinstalled windows XP...