## Search found 177 matches

Mon Jun 03, 2013 1:54 am UTC
Forum: Mathematics
Topic: Coin Flip Races
Replies: 5
Views: 2215

### Coin Flip Races

I've asked about this problem and could never get a solid answer. I hope XKCD can help. An example of the problem goes like this: You are keeping score in a head-or-tails game against your friend. One coin is flipped. If heads if flipped four times before tails is flipped 3 times then you win the ro...
Tue Oct 23, 2012 1:54 am UTC
Forum: Science
Topic: Will you weigh less on a scale if you exhale?
Replies: 33
Views: 20227

### Re: Will you weigh less on a scale if you exhale?

I asked this question (what feels like) ages ago and I seem to have gotten contradictory answers with no concensus. The following answer makes the most sense to me: "Neither. To calculate the weigh of a body on earth, we have to consider two forces: Gravitational force and the buoyant force. F_...
Sat Oct 20, 2012 3:38 pm UTC
Forum: Science
Topic: Do you lose or gain weight by exhaling?
Replies: 4
Views: 2253

### Do you lose or gain weight by exhaling?

You are standing on a very accurate scale and you breathe out. Does the scale go up or down? It's not as simple as "you lose air so you're lighter" - you probably have to factor in buoyancy or differences in air pressure/temperature. This is a question I've been pondering for a very long t...
Sat Oct 13, 2012 11:43 pm UTC
Forum: Gaming
Topic: Challenging iPhone puzzle games?
Replies: 4
Views: 1335

### Challenging iPhone puzzle games?

I'm looking for some good puzzle games for the iPhone. I particularly like LoopMaster, Drop7, and any variation of Nonograms.

Any suggestions?
Mon Feb 20, 2012 5:21 am UTC
Topic: 1019: "First Post"
Replies: 76
Views: 21447

### Re: 1019: "First Post"

Where do these dollar amounts come from? 1.5 Million seems awfully cheap..
Thu Jan 05, 2012 11:13 pm UTC
Forum: Mathematics
Topic: How do you properly analyse trends and changes?
Replies: 8
Views: 1286

### Re: How do you properly analyse trends and changes?

Thank you very much! This was very helpful!
Thu Jan 05, 2012 9:30 pm UTC
Forum: Mathematics
Topic: How do you properly analyse trends and changes?
Replies: 8
Views: 1286

### How do you properly analyse trends and changes?

I'm currently tasked to analyse census data about a local area around a school I teach at. I'm wondering how I would go about properly predicting what the population of the area in 2011 should have been. I am expected to just take the previous "change" and apply that for the next hypotheti...
Sun Nov 13, 2011 10:21 pm UTC
Forum: Science
Topic: What are some fun things to do to "fill-up" time in class?
Replies: 11
Views: 5706

### What are some fun things to do to "fill-up" time in class?

I'm a student teacher teaching Physics, Science, and Math. My greatest fear, especially in the Sciences, is that my lessons will run short on time. (ie. in a 70 minute period it will take 50 minutes to complete) Hypothetically, let's say I'm teaching a Physics lesson based on q = Ne. I would finish ...
Thu Aug 18, 2011 3:24 am UTC
Forum: Logic Puzzles
Topic: Can XKCD solve my puzzle?
Replies: 2
Views: 2859

### Can XKCD solve my puzzle?

Good luck. It's not incredibly difficult.
The title becomes less pretentious once you have the answer.

http://www.scribd.com/doc/62542106/The-God-Puzzle
Mon Aug 01, 2011 9:22 pm UTC
Forum: Books
Topic: Recommend me a good short story author...
Replies: 48
Views: 65985

### Recommend me a good short story author...

I've been reading a lot of Bradbury lately. I do really like it but I'd like to read something a little more...jarring. Specifically, I'd like to start reading short stories with surprising or twist-endings. Ray Bradbury is a master of the short story. The endings often leave you appreciating the st...
Tue Jul 05, 2011 11:51 pm UTC
Forum: General
Topic: Can XKCD help me solve this cheeky trick...
Replies: 5
Views: 1391

### Can XKCD help me solve this cheeky trick...

http://www.wimp.com/chessplayers/ Above is a video of a man who uses a certain trick to best 9 of the best chess players in the UK. The video IS long (10 minutes) but it is certainly worth it. I've been trying to work at how he got the sequence though. I'm sure it must be some algorithm.... With you...
Wed Jun 29, 2011 4:24 am UTC
Forum: Science
Topic: Losing weight...by breathing?
Replies: 33
Views: 5971

### Re: Losing weight...by breathing?

Another possible answer: You would lose weight by breathing in...
.
.
.
...helium
Wed Jun 29, 2011 4:05 am UTC
Forum: Science
Topic: Losing weight...by breathing?
Replies: 33
Views: 5971

### Re: Losing weight...by breathing?

Far from a homework problem. It's just something I've always wondered. I always imagine how much weight I lose when I shave, blow my nose, or urinate. The question of breathing is only natural.
Wed Jun 29, 2011 3:52 am UTC
Forum: Science
Topic: Losing weight...by breathing?
Replies: 33
Views: 5971

### Losing weight...by breathing?

Let's say you're a heavyweight boxer. Before the big fight, you have to step up to the scale and make sure you have an eligible weight. If you weigh more than 200.00000 pounds, you can't fight. You step up the scale and it read 200.00001 pounds. To lose this weight in an instant, should you exhale o...
Wed Apr 06, 2011 6:38 pm UTC
Forum: Science
Topic: Conceptional double-pulley problem (Tension)
Replies: 15
Views: 3277

### Re: Conceptional double-pulley problem (Tension)

Follow up question: when finding the net force, why do we NOT include the applied force (pulling down) in our calculation?
Wed Apr 06, 2011 12:58 pm UTC
Forum: Science
Topic: Conceptional double-pulley problem (Tension)
Replies: 15
Views: 3277

### Re: Conceptional double-pulley problem (Tension)

Pardon me, a diagram would be helpful. Here is a snapshot of the situation.
http://img848.imageshack.us/img848/7743/img01961.jpg

I'm asking how to explain where that second T comes from.
Wed Apr 06, 2011 12:18 am UTC
Forum: Science
Topic: Conceptional double-pulley problem (Tension)
Replies: 15
Views: 3277

### Conceptional double-pulley problem (Tension)

I was presenting a problem to a student that I tutor. A window washer is on a scaffold that contains a pulley above him to the left, and another pulley below and to the left of the first pulley. The rope is then tied at the end to the roof. The winder washer pulls on the rope. My issue was describin...
Fri Apr 01, 2011 6:41 pm UTC
Forum: General
Topic: Why does saving a word document to PDF make it look nicer?
Replies: 5
Views: 1341

### Why does saving a word document to PDF make it look nicer?

I'm a first year teacher and it's always been a natural instinct to save to PDF. What exactly is it about PDFs that make them so much more professional looking?
Thu Feb 24, 2011 10:39 pm UTC
Forum: General
Topic: Should this be AFFECT or EFFECT?
Replies: 4
Views: 1118

### Re: Should this be AFFECT or EFFECT?

Thank you.
Thu Feb 24, 2011 10:30 pm UTC
Forum: General
Topic: Should this be AFFECT or EFFECT?
Replies: 4
Views: 1118

### Should this be AFFECT or EFFECT?

I know this should go in Linguistics but I need a QUICK answer.

"She is in tears, so I tell her for now she gets a zero, but if she emails it to me over the Christmas break I will still mark it and she can have an (uneffected) grade."

And why?

Thank you!
Tue Jan 25, 2011 5:58 pm UTC
Forum: Mathematics
Topic: I need ideas for one-minute math games...
Replies: 6
Views: 1096

### Re: I need ideas for one-minute math games...

If I recall correcty, Nim always has a sure-win strategy. I wonder if I could pull it off without them figuring it out..
Tue Jan 25, 2011 5:51 pm UTC
Forum: Mathematics
Topic: I need ideas for one-minute math games...
Replies: 6
Views: 1096

### I need ideas for one-minute math games...

I'm student teaching a grade 8 Math class along with other teacher candidates. I have a group of 7 students and over the next 3 classes we're organizing a league and discussing how to make a fair league and the mathematics involved. Aside from setting up the league I'd also like to play out the sche...
Sun Dec 19, 2010 8:23 pm UTC
Forum: General
Topic: What is the best "chat" website if I wanted to tutor online?
Replies: 2
Views: 773

### What is the best "chat" website if I wanted to tutor online?

One where I can draw pictures and type and my tutee can join. It's for Physics.

EDIT: I've discovered flockdraw. It seems very neat, although it is missing easy access to some of the special characters I may use.
Mon Oct 18, 2010 4:34 pm UTC
Forum: Science
Topic: Memorable science experiments from grades 9 or 10.
Replies: 30
Views: 3794

### Re: Memorable science experiments from grades 9 or 10.

Unfortunately I don't have access to classroom chemicals. This experiment is for a Science Curriculum course, aimed at grade 9 and 10.
Fri Oct 15, 2010 9:40 pm UTC
Forum: Science
Topic: Memorable science experiments from grades 9 or 10.
Replies: 30
Views: 3794

### Re: Memorable science experiments from grades 9 or 10.

The experiments, including any explanations, are only to be 15 minutes long. They're just micro-experiments. Science-fair type things.
Fri Oct 15, 2010 9:21 pm UTC
Forum: Science
Topic: Memorable science experiments from grades 9 or 10.
Replies: 30
Views: 3794

### Memorable science experiments from grades 9 or 10.

I'm looking for ideas for science experiments for my student teaching experience at the grade 9/10 level One I really love involves putting an inflated balloon up to a candle and watching it explode. I then show the students a balloon filled with water, and ask them what will happen if I put it up t...
Wed Sep 29, 2010 3:13 am UTC
Forum: Mathematics
Topic: Ideas for a "Quadratic Equation" class demonstration/game?
Replies: 13
Views: 7224

### Re: Ideas for a "Quadratic Equation" class demonstration/gam

I really like the song idea, but deriving the formula just isnt...fun enough. Unless I could turn it into a game...
Tue Sep 28, 2010 11:27 pm UTC
Forum: Mathematics
Topic: Ideas for a "Quadratic Equation" class demonstration/game?
Replies: 13
Views: 7224

### Ideas for a "Quadratic Equation" class demonstration/game?

I'm looking for a "fun" game that involves quadratic equations (even in the slightest!) for my mathematics curriculum course. It can be something simple for kids in grade 8, or a bit more complex for grade 12. I don't want it to include graphing calculators and it should last around 30 min...
Tue Aug 03, 2010 12:54 pm UTC
Forum: Books
Topic: I'd like to know the name of this book/short story/comic
Replies: 666
Views: 271517

### Re: I'd like to know the name of this book/short story/comic

Thank you!
Tue Aug 03, 2010 3:46 am UTC
Forum: Books
Topic: I'd like to know the name of this book/short story/comic
Replies: 666
Views: 271517

### What is the name of this popular science fiction book?

It's about a team of time travellers (or maybe just one or two individuals). But there is a certain time period which they cannot travel to.

Vague ending spoilers:
Spoiler:
In the end, one of the females turns out to be from the forbidden time period.

Any idea? Thank you!
Mon Aug 02, 2010 6:00 pm UTC
Forum: Mathematics
Topic: Favorite math jokes
Replies: 1452
Views: 494194

### Re: Favorite math jokes

A man walks into a Mobius strip club. And simultaneously walks out.
Sat Jul 31, 2010 9:13 pm UTC
Forum: Mathematics
Topic: Favorite math jokes
Replies: 1452
Views: 494194

### Re: Favorite math jokes

Differentiating is very similar to Integration. Except the opposite.
Wed Jul 14, 2010 7:31 pm UTC
Forum: General
Topic: How much helium is required to lift a human?
Replies: 16
Views: 4829

### How much helium is required to lift a human?

I'm starting to plan my project for next summer: A helium balloon capable of lifting a ~150lb man.

No doubt it will be huge. It will likely be constructed out of heavy duty garbage bags.

Does anyone have any experience or expertise in this field?

Sun May 23, 2010 3:52 pm UTC
Forum: Books
Topic: I need a book recommendation (Renamed : Recom'd me a book)
Replies: 340
Views: 213555

### Hard Science Fiction Novels that XKCD approves of.

I've been looking for some new books lately. Something with a lot of science in it and zero fantasy.

Wed May 12, 2010 3:10 am UTC
Forum: General
Topic: What's the word for someone that likes neither men or women?
Replies: 9
Views: 2652

### What's the word for someone that likes neither men or women?

Asexual seems like the wrong word, considering it's usually meant to refer to someone with no sex drive.
What if someone enjoys sex, but doesnt like either gender?
Mon Apr 19, 2010 8:46 pm UTC
Forum: Science
Topic: Facepalm TV / Doing It Wrong
Replies: 553
Views: 63866

### Re: Facepalm TV / Doing It Wrong

Some people may hate me for this, but I hate any attempt LOST makes at science. *NO SPOILERS* When they bring up a concept, they would either flash over random numbers with no units or variables attached to them or have a mumbling scientist spew random words and changes he has to make to his numbers...
Mon Apr 19, 2010 7:47 pm UTC
Forum: Science
Topic: Is a High School Science teacher considered a "Scientist"?
Replies: 28
Views: 4007

### Is a High School Science teacher considered a "Scientist"?

It seems so, by definition.
Sat Apr 17, 2010 3:10 pm UTC
Forum: School
Topic: Proper clothes for student teaching?
Replies: 16
Views: 2827

### Proper clothes for student teaching?

I start student teaching next October (High School Physics). I'm looking to buy a new wardrobe and I want suggestions for what kind of clothes would be appropriate for a student teacher. I'm relatively young (20) and not quite tall (5'9") so I want clothes that distinguish myself from the stude...
Mon Apr 12, 2010 8:50 pm UTC
Forum: Mathematics
Topic: Favorite math jokes
Replies: 1452
Views: 494194

### Re: Favorite math jokes

What do you call a graph where every vertex is visible through your pants?

A Camel-Tonian Graph.
Tue Mar 16, 2010 10:21 pm UTC
Forum: General
Topic: A random and coincidental pattern I found....
Replies: 28
Views: 4063

### Re: A random and coincidental pattern I found....

Almost 3 years later, i've just revisited this problem. It never ends on your pinky (or any odd finger, for that matter). This reminds me very much of Kid 17. If you play Kid A by Radiohead (the album) from two sources, 17 seconds apart, many of the songs sync-in perfectly and create even more beaut...