watch Definition and 157 Threads

Just preordered a “Black Hole” version of the watch. It tries to mimic what it would look like to travel through a wormhole, in celebration of Einstein’s theory of relativity.

I got this watch nearly a year ago and love it. It is a celebration of the Apollo 11 moon landing. The planets orbit to tell you the time. The stars and planets glow in the dark as well!

Since gamma-ray bursts travel at the speed of light, my state of knowledge is that, if one were to hit Earth, we would of course only see it the moment it hits us. Furthermore, to my knowledge, we haven’t observed any GRBs within the milky way yet. However, what if there were a GRB within the...

Does mechanical watch ticks slower when move fast, due to relativistic effects? To make watch tick slower you must change oscillation of balance wheel inside watch, so if answer is yes, what myster "force" change balance wheel oscillation in mechanical watch to ticks slower?

Hi All I mentioned I was reading Peter Doherty's book on Covid. Good book. But it turns out there was no need to buy it even though it was cheap. He has it all on his institute's website, plus stuff he has written since releasing the book. Here it is...

A BH can't touch another hole's horizon for the same reason nothing else can: time drags the object to a halt for a distant observer. Right? Manifestly not. So are we wrong about gravitational time dilation, or what?

I have been looking at 'Horology' forums but they all seem to be more about buying watches and less about the way they work and about mending them. (Money money money). I sort of hoped that good old PF might have some ideas about my problem. When I was 21, my parents bought me an Omega...

So, I've been seeing a couple of teaser ad for this on TV lately. And it wasn't till yesterday that one actually peeked my interest. It had a short clip of a hooded figure interacting with a character. What was said and how it was said caught my attention. Then I thought about the title of...

Summary:: Is there a formula to determine when watch hands overlap? The other day, I was sitting on the can and, as I am won't to do, pondering matters of import to the known and unknown universe at large. During the event in question, I happened to notice my watch - and I am having the most...

When I was studying Physics we had a contest where we had to build a Cart that would travel the Furthest Distance. I Figured a Dry Ice Puck would do the trick as everyone was putting wheels on their design. So I asked my Instructor if I could use a Dry Ice Puck, He told the Class about the Dry...

What are some movies (or TV episodes) that you enjoy watching over and over again? - say at least once every two years. I often play old science fiction movies while I'm sitting at a worktable trying to fix something. The films don't have my complete attention, but there are a few I play over...

Does my wrist watch slows down on planet Jupiter? I know Jupiter's gravity is greater than Earth's gravity.

Assumption: Object 1 is moving and object 2 is static. It is impossible to say which object is moving without any reference object 3. There are three scenarios possible. 1. Reference object 3 is at same position in space time with object 2, then object 1 is moving and object 2 is static. 2...

Hello everyone! I'm a newcomer.I don't know a lot about physics because I'm just a student.What are the videos (in YouTube ) I should watch to gain knowledge in physics?

I just want to let you know what I suspect I got the virus from. I don't serve on questionable sites, no porn sites or anything close to like that. I read articles on Yahoo front page. Lately ( last year), they start to have articles like "How's you favorite tv stars from the 80s look like now"...

I was always scared about this argument, the autopsy. I'm asking how can a person watch person that is died and that will going to be cut and opened ? I know it's science, but it's very disgusting for me, and I know that my fear is strage because is like being afraid of how our body it's made.

Here's a great video of what one guy has to say about what he learned at university.. He really hits the nail on the head.. My favourite point is with "safety factors".. If something failed under normal use, it's not because you chose a 1.2 safety factor instead of a 1.5 safety factor, it's...

As I get older I am very closely keeping track of smart watches for their medical purposes. As someone who has heart disease in their family I am very interested in smart watches tracking cardio properties. Seems at last there is now real progress. Does anyone think this is worth getting a...

I would like to calculate the gear ratio of this moonphase watch, however i cannot calculate the exact day of its mentioned. What's wrong with my calculation? https://www.ochsundjunior.swiss/watches/moon-phase/tech-specs/ my calculation is 1/(2/12*14/18*14/109)/2=30.03 which is different from...

I'm actually running out of sci-fi movies to watch. I like sci-fi movies that keep their feet on the ground with science, don't mash much with fantasy (wizards, etc...) and at the same time spur "What If..." thought or make you pause and hop to the web to look something up. for example: Flat...

Does anyone know of any?I didn't find one which makes me think they don't ever get filmed.

Do astronauts watch satellite tv in space?

From, https://www.sciencenews.org/article/scientists-watch-bacteria-evolve-antibiotic-resistance For bacteria, practice makes perfect: Adjusting to ever higher levels of antibiotics preps them to morph into super resistant strains, and scientists can now watch it happen. A new device — a huge...

I thought I'd try a new experiment. Post a few video's that you saw today that you think might be of interest to the PF community. I know we have here the "YouTube classics" thread and the new section with the science videos, but this is designed to be more specifically attuned to what videos...

Watched it a few nights ago and still thinking about it http://www.imdb.com/title/tt1527186/ First part of the movie is super slow and has no sci-fi in it. However the second part is much more interesting. Certainly lots to think about and examine in the end. Very haunting. My mind is really...

I wondered, If I have an automatic diving watch that is designed to withstand, say 20 atmospheres of water pressure, is it safe to swim with it? When you dive, you do not hit the water as hard and with so many repetitions as you do while swimming. Do you think it is safe for the automatic...

1. My watch (which is a 12 hour watch) gains 3 minutes every 2 hours. a) I set my watch to the correct time at noon on 1st January. If I don't reset it, when will it next show the correct time? I got 48 hours after, so that's at noon on the 3rd January. as if my watch gains 3 minutes every two...

what does happen if i threw my watch into a black hole??

I'm halfway through the first season and I just don't get the appeal. Is it just an excuse for acceptable - even celebrated - misogyny and boorishness for men? I've heard criticism of "Entourage" for that, but didn't really buy it - in Entourage, the joke was on the biggest men (Vinny Chase...

Not in any particular order (all are active important research initiatives). 1. Algebraic geomatter (google "geometry and the quantum: basics") 2. LQG with constant curvature simplices (embodying the cosmological curvature constant Λ) 3. Flux formulation LQG 4. LambdaCDM bounce 5. Projective...

i will start with Jeremy Kyle show - i know it is chav tv but just can't resist a good lie detector test episode.

Part of my job as a lifeguard is dispatching guests at water slides at a busy amusement park. Believe it or not, these people paid quite a bit to get in, and I actually care about them, so I would like to fire them off at the maximum rate possible. Sadly, I am responsible for timing this - I...

This is an awesome video explaining what it takes to do the stuff my daughter teaches. But I think it applies to anything one would like to accomplish. Watch and be motivated. :approve: https://www.youtube.com/watch?v=dLftsQKFPZg

Solar Flare Must Watch! guys and gals if you haven't seen this video of solar flare yet, then hold onto your seats! make sure you view it in full screen mode :smile:http://www.space.com/19873-blazing-arc-rains-fire-on-sun-magnetic-solar-flare-loop-video.html I have seen many flare videos over...

It could go here, or in the General Discussion. Amazing: http://www.wimp.com/glaciersplit/

Society deems adults who watch cartoons as childish and immature. Why is this? Some of the cartoons contain clever pop culture references and have nice humour. Then why don't adults watch it? Google-ing gave me the following answers:- - Some of the humour in cartoons is childish and doesn't...

I remember seeing a demo of collisions inside a conductor. It was a long board with nails representing the atom positions (a square lattice arrangement) and you would put a hand full of marbles at the top. The marbles will slide down but since they keep hitting the nails the velocity will be...

hey guys anyone interested in seeing and or photographing aurorae an alert has been issued today 21 Aug 2013 AEST = Australian Eastern Standard Time cheers Dave

I'm curious? Do you prefer analog? Digital? No watch? Any specific brands or features you wouldn't wear a watch without?

Homework Statement The balance wheel of a watch is a thin ring of radius 0.95 cm and oscillates with a frequency of 3.10 Hz. If a torque of 1.1x10-5 Nm causes the wheel to rotate 45°, calculate the mass of the balance wheel. Homework Equations I=mr2 T=(2π)sqrt(I/mgh) τ=-Kθ The...

Is there any serious work with calculations and explanations about this topic? Any references? I know that that digital watch is a combination of physics(piezoelectric effect) and logic, but i need to know much more.

Hello, Some physics books tend to say that "your wrist watch will be beating slower when you travel at the or close to the speed of light." Does that mean literally? My own speculation: Although time does slow down when I travel at a speed close to the speed of light, my wrist watch will not...

I got a very basic laptop which I just use for browsing (facebook, twitter, news etc.) Specs: Intel Atom Processor 1.66GHz 512kb cache 1GB RAM Ubuntu operation system It's perfect for just browsing, basically its only purpose, but when I watch youtube videos it lags. I've tried letting...

I know why I don't watch them cause they're crap, and I don't get the point of being famous for having no talent, but just curious if people with scientific backgrounds and higher education enjoy them?

Homework Statement A person does .02 Joules of work winding a watch. Assuming NO loss of energy to friction, how much energy is stored in the watch's main spring?Homework Equations PE=1/2kx^2 ?? I have no idea..The Attempt at a Solution I've gotten nowhere trying to do this problem without...

Algebra - "Quartz Tuning Fork" Watch Homework Statement Many modern watches operate based on a small quartz tuning fork which transduces a mechanical oscillation into an electrical signal. The frequency of the tuning fork is inversely proportional to sqrt(l), with l being the length of the...

This is nothing short of amazing. MIT figured out a way back in February to view how light 'moves' on, about and through objects. Here is a link: http://www.youtube.com/watch?v=snSIRJ2brEk&feature=related They apparently use multiple staggered high speed cameras to capture the images and...

Curiosity will hopefully land safely on Mars at 1:31am EDT, after "Seven Minutes of Terror" and NASA TV will be broadcasting a a show for this starting at 11pm EDT at http://www.nasa.gov/multimedia/nasatv/ustream.html I'm more excited and anxious about this than I have been for every Olympic...

Here is a great video of water flow: http://www.youtube.com/user/brusspup

The video, http://www.youtube.com/watch?v=XDCk0DaNwiQ&feature=results_video&playnext=1&list=PL28AFB6F1D7079B62 Observation of our chickens, when a chicken walks the head is kept motionless and then moves quickly to a new position, repeating over and over again as the chicken moves forward...