Tricky Puzzles

tyteen4a03 · Post by **tyteen4a03** » Sun Dec 06, 2009 4:46 am

Marinus wrote:I'm sorry Tyteen, but the answer is not right. I have no idea how you came to that anwer, but the speed can never be higher then 600,000 m/s (600km/s). If the dog would walk that speed, he would reach the finish in 1 second. I guess with a speed of 10^180 it would be halfway Jupiter.

I just repeat the 2^2 process for 599 times

Marinus · Post by **Marinus** » Sun Dec 06, 2009 10:18 am

Kooky, I don't quite understand about that formula: (n/2)(2a+(n-1)d)=y and the way you use it, but I'm sorry, the anwer is also wrong.

24 km/s = 24000 m/s and 24000 is not an exponent of 2. Then it would be either 16384 or 32768

If the dog would walk with a speed of 32768 m/s for 1 second, in that second he would walk a distance of 32768 m.

If the dog would have doubled his speed every second, the distance walked in all the previous seconds together would be 1+2+4+8+16+..+..+16384 = 32767 m and the total distance would be 65535 m which is about 65.5 km, just a bit more then 1/10 part of the distance he has to walk.

I used a few times the word "IF". Remember, it's still a tricky puzzle.

Muzozavr · Post by **Muzozavr** » Sun Dec 06, 2009 11:34 am

Assuming that the dog never tires and can reach any speed and the metal doesn't fall off:

He will reach 512 m/s at which point he will stop hearing the sound altogether (speed of sound in air = approx. 340 m/s and can differ depending on the air itself but never reaches 500 m/s) and just keep going with that same speed.

Unless the sound that is transferred via asphalt (which is almost inaudible but it's there) is enough to keep the poor dog running faster and faster. Then the next speed in this "double the number" progression that is above the speed of sound in asphalt, which Google flat-out refused to give me just now.

And that "sound velocity in common solids" table I just found? Asphalt not a common solid?! Jerks.

P.S. I think you changed this one up, unless there's another version I'm not aware of. The original, IIRC, was "how fast does the dog need to go to stop hearing the sound?" to which some people immediately reply "with supersonic speed" while in fact the dog just needs to stop.

You inversed it and enforced the "supersonic speed" thing while wording it in such a way that people forget about it. Nice job!

Marinus · Post by **Marinus** » Sun Dec 06, 2009 12:45 pm

Muzo, I should have known you would solve it the right way. It's indeed 512 m/s with a soundspeed of 340 m/s.

I didn't change the riddle; this is the way they told me a long time ago, but maybe someone else changed it before. Indeed as you say about the original version you knew, that's more obvious. If you wouldn't have given the correct answer I probably had give hint such as: It's about the word "hear"

Muzozavr · Post by **Muzozavr** » Sun Dec 06, 2009 1:02 pm

What about the sound transferred via asphalt? Is that enough?

Marinus · Post by **Marinus** » Sun Dec 06, 2009 1:19 pm

Well I have to admit I don't know the sound speed through asphalt either. But if we knew it would be a very complicated calculation, and we also need to know the vertical distance from the dog's ears to the ground, unless he can hear with his feet. The sound must go through the asphalt to a point far before the dog and then another bit through air. Also the dog may take a shorter route by going off-road.

Muzozavr · Post by **Muzozavr** » Sun Dec 06, 2009 1:48 pm

Marinus wrote:Well I have to admit I don't know the sound speed through asphalt either. But if we knew it would be a very complicated calculation, and we also need to know the vertical distance from the dog's ears to the ground, unless he can hear with his feet. The sound must go through the asphalt to a point far before the dog and then another bit through air. Also the dog may take a shorter route by going off-road.

Sound that goes through asphalt can then go through the dog and reach him from the inside. Vibrations work too.
But anyway, that's why we just stick to the simple answer: 512 m/s.

Now it's my turn. Can you find the message in this repetitive riddle?

This text gives you a puzzle through constant repetition. This text gives you a puzzle throuh constant repetition. This text gives you a puzzle through cnstant repetition. This text gives you a puzzle thrugh constant repetition. This text gives you a puzzled through constant repetition. This text gives you a puzzle through constant repetitjion. This text gives you a puzzle through constant repetitin. This text gives youb a puzzle through constant repetition. This text gives you a puzzle through constant repetition.

tyteen4a03 · Post by **tyteen4a03** » Sun Dec 06, 2009 1:58 pm

Muzozavr wrote:
Marinus wrote:Well I have to admit I don't know the sound speed through asphalt either. But if we knew it would be a very complicated calculation, and we also need to know the vertical distance from the dog's ears to the ground, unless he can hear with his feet. The sound must go through the asphalt to a point far before the dog and then another bit through air. Also the dog may take a shorter route by going off-road.
Sound that goes through asphalt can then go through the dog and reach him from the inside. Vibrations work too.
But anyway, that's why we just stick to the simple answer: 512 m/s.

Now it's my turn. Can you find the message in this repetitive riddle?

This text gives you a puzzle through constant repetition. This text gives you a puzzle throuh constant repetition. This text gives you a puzzle through cnstant repetition. This text gives you a puzzle thrugh constant repetition. This text gives you a puzzled through constant repetition. This text gives you a puzzle through constant repetitjion. This text gives you a puzzle through constant repetitin. This text gives youb a puzzle through constant repetition. This text gives you a puzzle through constant repetition.

Good Job Muz!

Marinus · Post by **Marinus** » Sun Dec 06, 2009 2:03 pm

Yes I see it, but it's just the same story like last year that I don't know anymore riddles to post. I only remembered that dog riddle. So maybe someone else will give the answer and also have a new riddle to post.

BTW if there was no trick with soundspeed in the dog riddle, it wasn't really very hard to calculate, especially if you use Excel (see screenshot)

Muzozavr · Post by **Muzozavr** » Sun Dec 06, 2009 2:14 pm

524288 is a lot.

It's much, much more than the third escape velocity (speed needed to leave solar system) and comes close to the preliminary calculations of the fourth escape velocity 550 km/s (speed needed to leave milky way)

tyteen4a03: was that a compliment or an answer?

dlcs18 · Post by **dlcs18** » Sun Dec 06, 2009 2:18 pm

Muzozavr wrote:This text gives you a puzzle through constant repetition. This text gives you a puzzle throuh constant repetition. This text gives you a puzzle through cnstant repetition. This text gives you a puzzle thrugh constant repetition. This text gives you a puzzled through constant repetition. This text gives you a puzzle through constant repetitjion. This text gives you a puzzle through constant repetitin. This text gives youb a puzzle through constant repetition. This text gives you a puzzle through constant repetition.

...how are we supposed to even begin figuring out this one?

Maybe the fake typos have something to do with it...

dlcs18 · Post by **dlcs18** » Sun Dec 06, 2009 2:21 pm

AHA!

The answer is Good Job... or something.

Muzozavr · Post by **Muzozavr** » Sun Dec 06, 2009 2:22 pm

dlcs18 wrote:AHA!

The answer is Good Job... or something.

Yes. So I don't even know if tyteen was saying the answer or just a compliment.

Marinus · Post by **Marinus** » Sun Dec 06, 2009 2:31 pm

Muzo wrote:It's much, much more than the third escape velocity (speed needed to leave solar system)

Let's hope he could just grab the top of the Eifel Tower before leaving Earth.

tyteen4a03 · Post by **tyteen4a03** » Sun Dec 06, 2009 3:36 pm

Muzozavr wrote:
dlcs18 wrote:AHA!

The answer is Good Job... or something.
Yes. So I don't even know if tyteen was saying the answer or just a compliment.

Both.

tyteen4a03 · Post by **tyteen4a03** » Mon Dec 07, 2009 3:32 pm

D-P
What's the ultimate fate of the human? What is causing it?

(Assuming UN cannot stop anyone)

Muzozavr · Post by **Muzozavr** » Mon Dec 07, 2009 5:07 pm

If you're going to post a scientific riddle, then do proper research. The "heat death" theory is but one of many.

See: http://en.wikipedia.org/wiki/Ultimate_f ... e_universe

Marinus · Post by **Marinus** » Mon Dec 07, 2009 7:39 pm

Also in my opinion, a tricky puzzle should have one clear answer.

So I think a scientific question which are many theories about but no real answer is not really a tricky puzzle.

Sammy_Bro · Post by **Sammy_Bro** » Mon Dec 07, 2009 11:35 pm

And then came the indestructable fungal object again.

The End.

LittleZbot · Post by **LittleZbot** » Tue Dec 08, 2009 1:36 am

The answer is:

God will destroy it. At the end of the World, God will take Christians up to heaven and those who are left on Earth will be controlled by Satan. When it seems the Devil has won, God will Kick his beautiful Butt out of here.

Then all the Christians will live forever and ever in Heaven.

Emerald141 · Post by **Emerald141** » Tue Dec 08, 2009 1:37 am

Um, that's just Earth. We're talking about the entire universe.

MyNameIsKooky · Post by **MyNameIsKooky** » Tue Dec 08, 2009 1:49 am

Alright, here's how the universe ends:

A large amount of MUDKIPZ0RZ!!! randomly come to Earth and seperate in groups of not one, not two, not three, not five but four MUDKIPZ!!!11ONEONE!1! The groups will mob every human on the planet until Earth is unpopulated. The mNdk1pz will then proceed to work together to bump Earth into the Sun. Earth will burn in the sun. Now that's just Earth. OR IS IT?

The MUKIPZ0RZ will gain inspiration from destroying Earth and put the sun and all nearby black holes, stars, asteroids etc. in the galaxy into a random giant freezer. This causes the sun to become a red giant and swallow everything inside the freezer. The red giant will shrink down to a dwarf star inside the freezer after that.

The mudkips wonder how to PWN the rest of the universe when a random tissue box bumps into the freezer. The tissue box's prime weight causes the dwarf star inside the freezer to asplode the whole universe.

So, mudkips will cause the end of the universe.

dlcs18 · Post by **dlcs18** » Tue Dec 08, 2009 1:50 am

LittleZbot wrote:The answer is:

God will destroy it. At the end of the World, God will take Christians up to heaven and those who are left on Earth will be controlled by Satan. When it seems the Devil has won, God will Kick his beautiful Butt out of here.

Then all the Christians will live forever and ever in Heaven.

That's from a religious point of view, not a scientific one.

tyteen4a03 · Post by **tyteen4a03** » Tue Dec 08, 2009 9:10 am

I have edited the question a little. I wasn't thinking straight

PS

What was causing it is artifical

Muzozavr · Post by **Muzozavr** » Tue Dec 08, 2009 10:08 am

Again, too many possibilities.

One of the possible answers is that humans will naturally go extinct and some other species will take over.

Another is that humans will live on until the Sun becomes a red giant and renders Earth uninhabitable.

Yet another is that they will live on forever unless the universe ends.

I don't know anything "artificial" though that could cause something that massive.

Marinus · Post by **Marinus** » Tue Dec 08, 2009 10:53 am

Tyteen wrote:What's the ultimate fate of the human? What is causing it?

(Assuming UN cannot stop anyone)

Perhaps a total war (nuclear, biological, chemical weapons) all over the world.

Still not really a tricky puzzle in my opinion.

tyteen4a03 · Post by **tyteen4a03** » Tue Dec 08, 2009 11:32 am

< has no idea how to design a puzzle, so I just randomly post a question.

(Marinus: You are nearly there!)

Marinus · Post by **Marinus** » Tue Dec 08, 2009 11:54 am

I have to admit I can't design such riddles either. The only riddles I posted were those which I remembered someone told me.

As for your question; I can't think of anything else but weapons of mass destruction. Of course there are rumours about climate changing, or sea level rising, but first: I don't think that will cause the end of all human life, and second: The big question is how much they are artificial cause. Such things also happen by natural cause.

tyteen4a03 · Post by **tyteen4a03** » Tue Dec 08, 2009 12:53 pm

Marinus wrote:I have to admit I can't design such riddles either. The only riddles I posted were those which I remembered someone told me.

As for your question; I can't think of anything else but weapons of mass destruction. Of course there are rumours about climate changing, or sea level rising, but first: I don't think that will cause the end of all human life, and second: The big question is how much they are artificial cause. Such things also happen by natural cause.

My meaning is to find why will there be big wars.

Answer:

Greed, Betreyal and fear. (I just can' find a word to summerize it up). "I want better life of mine so I waste water." "I want more land so I start a war" "I want something so I do something"

Even UN cannot control human emotions.(right word?)

Marinus · Post by **Marinus** » Tue Dec 08, 2009 5:06 pm

Yes I hadn't thought of it that way, but I think you're right.