Christmas Definition and 131 Threads

Alright guys, spill the tea... what'dya get? Santa gave me a neat little periodic table paperweight-thing with some samples inside. 😄 Happy Christmas!

Is this really true? It resembles the binomial theorem. I've posted it twice which might be breaking rules. Happy Christmas PF.

Merry Christmas PF members! Thanks everyone for another interesting and fun year! And thanks to @Greg Bernhardt for keeping the forum alive! (especially during these trying times we have lived, and are living, with the corona virus)

Hey! :giggle: The burning time of an electric candle is between $60$ and $80$ hours. It is considered to be continuously uniformly distributed over this period. A Christmas tree with $12$ candles (independent of the burning time), only lights up as long as all candles are working. Determine...

If a string of blinking Christmas lights extends from the center of a black hole out to a large radius r. What do I see, if I am perpendicular to the line of lights, at radius r? Experiment specifics 3 solar mass, non-charged, non spinning black hole. Observer is 1,000 Au from the center of...

It was a gift from my daughter and her boyfriend. I had the older Flight Simulator X, and the timing of the release of this new version coincided with my getting a new computer. I'll have to say that I am impressed. Even though I'm not running the graphics at the full realism setting, I was...

Merry Christmas to all!

https://journalstar.com/lifestyles/this-is-how-much-all-the-12-days-of-christmas-gifts-would-cost-in-2020/collection_28e0c5e7-247c-56a3 It is less than 2019 because live performances violate CDC pandemic social limits - still $US105k ... you know the 10 lords a-leaping, etc. :biggrin:

My niece, Nora Rodes, singing O Holy Night

For me, this song sums it up quite nicely: What do you hope for Christmas this year?

With now over 800 homes destroyed, 300+ damaged and countless numbers of wildlife lost. Welcome to Christmas 2019 in Australia :cry::frown: from my Facebook

Hope you all have a happy Christmas and a fruitful new year, may be you can post your accomplishments for the new year?

I posted this link a couple years ago, but just in case you need to draw a Christmas Tree: https://tex.stackexchange.com/questions/39149/how-can-we-draw-a-christmas-tree-with-decorations-using-tikz There are a lot of interesting variations posted, maybe PF could have our own contest! Here's...

I have a bit of a puzzle I'm trying to answer. A K2 civ decides to celebrate Christmas, so they build a circuit of trillions of Christmas lights 1 LY in circumference. When they flip the on switch, what happens? Do the lights come turn on one after the other in response to the electrical...

Homework Statement You look at yourself in a shiny Christmas tree ball, which has a diameter of 9.63 cm. If your face is 7.81 cm away from the shiny ball, calculate the image distance. Homework Equations ? Thinking I would use magnification = di/d0 di = 0.0781m d0 = 0.0963m The Attempt at a...

Homework Statement For a high school physics class, I chose to build a tesla coil for a real world application assignment. I was able to build it fairly easily and it turned out great. Before presenting to the class next week, I've been seeing its effect on different types of light bulbs and...

I was sure there were one or two threads on in this forum on “what music are you listening to now?“ or favourite tunes or similar title title that was quite active, sure because I intended to post there when I got round to it. But I can’t find it now. But never mind for : This is the time for...

For all of you that celebrate Christmas, Have a happy one and a great new year Christmas is all ways a good time for us as this is the only time all the family get together. We usually hire the caff or the church hall so we can all fit in, in our house is way to small to fit every one in For...

I have a very nice Christmas electric candlestick that is I can no longer get to work properly. Originally, it came with incandescent light bulbs running in 6 V DC. Some of the lights have burned out, so I looked for replacements and can now only find LED lights. The ones I got are labelled...

I was looking for something else at Stack Exchange and found a how to draw a Christmas tree with Latex thread. I thought the one by Loop Space was the best! http://tex.stackexchange.com/questions/39149/how-can-we-draw-a-christmas-tree-with-decorations-using-tikz

Hi. I helped my neighbour putting up (quite old, no LEDs) strings of Christmas lights and noted that some of them (different brands) are connected in parallel, others in series. Inevitably, we found several of the serial strings not working due to defective bulbs. We replaced the visibly...

I am very happy to receive and send Xmas cards:biggrin:. I still have some addresses, so please let me know is you want a card from me.

Hi, I want some suggestion about christmas decorations, Because I`ll guest a party with my family & friends, So, I need some help. Cheers, Rebeca

Haha :smile:

Got a question: I've got a Christmas tree that needs lights strung on it, but I want to know how to hang the lights so that the entire string is spaced evenly and it ends at the top with nothing left over. I figure there's a formula to derive this, but I don't know what it may be. Any...

Homework Statement During the Christmas holidays, 42 students from a group of 85 students found vacation employment while 73 students went away for holidays. Assuming that every student had at least a job or went on a holiday, what is the probability that a randomly selected student worked...

Background image compliments of Teacher Juanfran

I hope everyone has a happy xmas and a fruitful new year, To all the female type people hugs and kisses., to all the male type people hand shakes and salutations..

what should i do for a three week break for Christmas?

Seeking awesome gift ideas for an awesome dude.

Now what? It's a Kindle HD 8.9 with 64g memory. Got a great price on it and it came with 24/7 lifetime tech support so it's like the "Mayday" service, except I have to call them instead of press a button. But I don't know what to do with it. I tried reading a book with it and it sucks...

The legendary Swedish opera singer Jussi Björling recorded what has become a very beloved version of Adolphe Adam's (1847) "O helga natt" ("O, holy night!") here in Scandinavia. Enjoy! :smile:

AN ENGINEERING PERSPECTIVE ON CHRISTMAS There are approximately two billion children (persons under 18) in the world. However, since Santa does not visit children of Muslim, Hindu, Jewish or Buddhist (except maybe in Japan) religions, this reduces the workload for Christmas night to 15% of...

Merry Christmas to you all! And thanks to all administrators, mentors and members for making this forum into a very useful, helpful, educational, interesting, inspiring and fun place to be!

Hello, my name is Mike, and I have just enough electrical engineering knowledge to be dangerous. This season I have inherited a programmable LED Christmas light set up from my father-in-law who is no longer with us to help guide me with his EEngeneering knowledge. Here's the issue. I have...

This is not engineering (perhaps a social engineering :wink:). I am thinking about Christmas gifts and I decided one of those I have to buy can be some reasonable Arduino starting kit. Question is - what does it mean "reasonable starting kit"? Target: bright teenager with some programming...

Here it is, 105 days until Christmas, and Kmart has already started bombarding us with Christmas ads. http://www.cnbc.com/id/101023738 Walmart and others are apparently about to follow suit. This Christmas creep is starting to get old. Time for some old-fashioned Christmas music! (1978...

I always wanted to know how this worked? I know AMPs is how many Electrons move past one point in a SEC. I know that Voltage is the Force that drives the AMPs. I know that a House Outlet will supply 120 Volts at 15 Amps. Now take Christmass Tree Lights and to keep this easy let's...

"Merry Christmas" vs. "Happy Holidays". What's with all this objection to saying "Merry Christmas"? What's next? Objecting to saying "happy Halloween" because people who don't celebrate Halloween might get offended?

Hai, calculators connoiseurs, hope you can help this lost lamb. Non-connoiseurs, come in, you might learn something from our experts in the field :biggrin: Now...I've used a Sharp EL-506W for four and half years. Its main drawback is the lack of a proper way of representing big huge equations...

I am a freshman in physics at this point, and looking to get some ideas of some things that I might want to add to my Christmas wish list involving my profession? Although this probably won't make much of a difference, I am a 34 year old adult changing professions to one I have always loved...

My cousin, like me, is interested in physics. She, also like me, aspires to become a physicist. For Christmas she wanted a telescope, unfortunately, the one she wanted was $2000, and her mother was not willing to buy her something so expensive as they had just recently returned from a very...

Homework Statement A Christmas tree ball hangs from a hook in the ceiling. If the radius of the ball is 8 cm, find the period of the ball's oscillation as it swings on the hook. Homework Equations T=2pi*√L/g The Attempt at a Solution I tried pluggin the number and I'm way off...

Forgive the sloppy use of math and inability to produce an image. I noticed this last christmas. If you have a fairy light ( or perhaps any LED etc), and shine it normal to a surface, you see a circle. If you place the light flat on the surface you see a curve - to me the fairy lights' curve...

You should have seen my face when I tore open one of my christmas presents this year. I got a MEADE ETX-80 Refracting Telescope. Last night the sky was a bit cloudy, thus we could not see any stars, or the moon, thus we couldn't use the telescope. But tonight it was a perfect night. Me and my...

What did you or your significant other get for Xmas this year? Anything surprising, anything unexpected or over-the-top or just totally unexpected? My wife got fuzzy sandals from her sister that make her look like the Energizer Bunny, but she wore them last night. Duke got a tug-toy that...

Tis almost the season when all of the folks hired temporarily for the Christmas season get tossed out on the streets, to wander aimlessly about until they find the unemployment line. I wonder what it must be like to be a Christmas season temporary employee. Finally, someone has captured the...

Hello, I'm new to these forums and not 100% sure of where this type of thread would go. I have decided that this year, for Christmas, I would be getting a bunch of books on [FONT="Comic Sans MS"][SIZE="5"]science :cool:. I got up to $200 dollars to spend, including shipping, and want to know...

Hello there! I was decorating my Christmas tree recently, and for some strange reason, I thought: "Hrm, I wonder if I could come up with an optimization problem where I have a definite length of lights/garland, and want to have equal space between each strand of lights/garland as they go around...

A holiday tree made of books! Here's a picture of a Holiday tree made of books on the second floor of the library at my university. I believe a few members of the student union built it, and they must've done it after closing hours (midnight) because I was there until 11:30PM and it wasn't up...