The Sphinx's Lair

North Læraðr

01:06

I believe ALICORN MAGAZINE or maybe just ALICORN might be def

telling is probably a homophone indicator

bobble

at least 0 of your ideas are correct.

North Læraðr

Thanks for the hint

:/

That was actually a big clue :)

Sphinx

0

Q: Find the hats Puzzle - Original Self Creation

I have created several riddles with my brother, one of my favourite ones is this one. It is based on the classic prisoner hat riddle, but it has an original twist. TASK: You have to guess which ones are wearing green hats and which ones are wearing black: DESCRIPTION: A, B and C can see the hats...

North Læraðr

That means that something to do with "in the end" or something is the definition

but six words? hm

SOHRAW?

hm

bobble

the intention was to give away no information: "at least 0" means 0, 1, or 2

North Læraðr

01:17

Hm, if the definition is ALICORN, it's (7 letter word) WINGED HORSE WITH A HORN

Perhaps ALICORN, WINGED HORSE WITH A HORN?

I don't think ALICORN is the first word

maybe something to do with combination

Interesting. Alicorn is an anagram of Locrian

that

is kinda sick

@bobble Why do I have a feeling something is connect to MLP

North Læraðr

02:24

Um someone wanna help me with this physics question real quick?

I just need some extra pointers

"3) A bottle is dropped from a moving airplane (ignore the effect of air resistance). If the plane from which the bottle was dropped was flying at a height of 500m, and the bottle lands 400m horizontally from the initial dropping point,

a) how fast was the plane flying when the bottle was released?"

So x(0)=0 and x=400 m and y=500 m

I'm not sure what else to do

Bc I don't have time... unless is it just 500*m/9.8(m/s^2)?

Actually I'll just ask on physics se

Ankoganit

02:41

@NorthLæraðr in case you're still looking for a pointer, try considering the motions in the x and y-directions separately.

North Læraðr

@Ankoganit Yeah I fugured it out

Ankoganit

ah cool

North Læraðr

I solved for time by plugging in the equation for solving for "y"

Ankoganit

nice

North Læraðr

I hope that was correct

Okay another question

Sorry hold on

merrybot

02:45

cryptic clue b/c why not:

evil circles constantly observing the head and foot of the Spanish kill (7)

North Læraðr

Actually let me trying solving it first :P I skipped a letter

merrybot

for those who don't remember, this is @matt

North Læraðr

Okay so yeah

" A lacrosse player slings the ball at an angle of 30o above the horizontal with a speed of 20 m/s. What will be the impact velocity of the ball (Hint: you don’t need to do any calculations)"?

Ankoganit

@NorthLæraðr hint: what happens to the horizontal and vertical components at the end of the flight?

North Læraðr

Yeah?

Deusovi

02:57

(assume that the ball starts from precisely ground level, and that there's no air resistance?)

North Læraðr

@Ankoganit Zero?

Ankoganit

@Deusovi Of course, standard lacrosse rules

@NorthLæraðr hm, why?

North Læraðr

Wait, no the velocity would be at its maximum....

Ankoganit

@NorthLæraðr suppose the horizontal component was 15 at the start (it wasn't), what wuold it be at the end?

North Læraðr

Or at least the y velocity

@Ankoganit It would still be 15, no?

Ankoganit

02:59

yep

now what about the vertical component?

North Læraðr

Hm

The final velocity of gravity?

gravity times time?

Oh wait

Ankoganit

let's try to avoid calculations

if you throw something straight up at 15 m/s, what's the velocity when it comes back at the same point?

North Læraðr

The diagram that my teacher has on the bottom v(y)=-v(y0)

Ankoganit

@NorthLæraðr yes! Does that make intuitive sense?

North Læraðr

Hm, kind of. I'm trying this out in my head real quick

Ankoganit

03:02

(a good way to see why would be comparing the kinetic energy before and after)

North Læraðr

Oh I see that's a good example

Ankoganit

so what does all this mean in our example?

North Læraðr

Oh! I got it

Ankoganit

good work!

North Læraðr

Hold on I'm typing out the explanation so you can confirm

Ankoganit

03:05

sure

North Læraðr

The ball when travelling up travels the same amount of distance falling down, except the velocity is flipped because on the way up gravity pull it down, but since it travels in the same arc (so same distance down) it should land with the same velocity

If that made sense

Like

If you cut the parabola in half

Ankoganit

intuitively that makes sense

North Læraðr

they're equal, but just flipped in how the velocity moves

Yeah

Ankoganit

idk how much rigour your teacher expects

North Læraðr

It's an AP course so I think I'm expected to understand this

Ankoganit

03:07

@Ankoganit this is something i never figured out about physics teachers

North Læraðr

Honestly my teacher doesn't really teach much...

Ankoganit

(on that note, I think an easier way of phrasing all this would be "reversing time"; if you play the whole flight backwards, tha's an identical process. There's something called T-symmetry that makes this precise.)

@NorthLæraðr ouch

that's unfortunate

North Læraðr

Yeah.

Neither does my math teacher, and this is why I'm struggling in my STEM classes

Ankoganit

:(

merrybot

hmm

Ankoganit

03:11

My physics prof from last year was weirdly enthusiatic about teaching

"Hurray, Gaussian distributions!" was basically his catchphrase

I've never seen a man this excited about Gaussian curves

merrybot

wow

Sphinx

0

Q: A simple cryptic clue

Evil circles constantly observing the head and foot of the Spanish kill (7) What word is indicated?

cryptic-clues

North Læraðr

@Ankoganit I think the easiest way prob would've been like the displacement of the ball travelled is the same but at different directions. If i used the term displacement correctly

Ankoganit

something like that, yeah

also, I just realised we could just compare KE right away @NorthLæraðr

welp

North Læraðr

Yeah...

Deusovi

03:33

i was gonna hint at KE but ankoganit seemed to be handling it well

North Læraðr

If a ball is thrown straight up at 20 m/s and another ball is thrown at an angle of 30 degrees above North at 20 m/s they don't have the same peak height right?

wait that's irrelevant

"Jim and Sara stand at the edge of a 50 m high cliff on the moon. Jim extends his arm over the cliff edge and throws a ball straight up with an initial speed of 20 m/s. Sara throws an identical ball with the same initial speed, but she throws the ball at a 30 degree angle above the horizontal."

"Now consider each ball just before it hits the ground, 50 m below where the balls were initially released. At this point:
Which ball has the greater vertical velocity?"

I was going to say they were both the same velocity, but I'm not sure that's right anymore

merrybot

also the Moon has 1/6 Earth's gravity, don't know if that matters or not

it might but idk

North Læraðr

Doesn't matter. The whole point of this question is to answer without plugging it into equations

merrybot

ah ok

North Læraðr

You can reference the equation, but it's a waste of time to

Also, since both balls are at the moon, the gravitational pull down is the same

merrybot

03:41

right

North Læraðr

I mean, the balls were both launched at 20 m/s, so I don't think the angle matters in the verticle velocity. I would've said it's the same if it hit the floor where they were thrown from, but I'm not sure when it''s below.

merrybot

assuming the bottom of the cliff is completely level, I would think so

I was going to program a simulation for you but I couldn't figure out how to

but just try diagramming it with your finger, they stay at the same altitude relative to each other

thus their SPEED is the same

but VELOCITY incorporates DIRECTION

so the one thrown straight up I think

bobble

A Vector has both Direction and Magnitude :)

merrybot

yes

velocity has both a direction and a speed

North Læraðr

@bobble Help

merrybot

03:46

so the one with the greater vertical velocity is the one thrown straight up

bobble

how?

merrybot

see my reasoning above

and the problem given

Ankoganit

I think @merrybot is right

Deusovi

@NorthLæraðr more physics problems should be set on the moon for no discernible reason

North Læraðr

Okay, so the velocity when they hit the ground if it landed at the same level is the same

Like

Deusovi

03:47

(apologies for interrupting, carry on)

North Læraðr

thrown from 50 meters and landing after 50 m

merrybot

the SPEED.

VELOCITY adds DIRECTION

Ankoganit

yes

North Læraðr

@merrybot Velocity thrown upwards still has direction mate

Deusovi

"vertical velocity" is specifically one of the two (three? ~~four?~~) components of velocity

Ankoganit

03:48

The speed is the same because of the same KE argument

North Læraðr

Hm

merrybot

but the velocity?

North Læraðr

It's asking for the vertical velocity, not the magnitude

I think you're right on the mignitude?

Deusovi

right, so

Ankoganit

yes, exactly

merrybot

03:49

hmm

North Læraðr

I'm confused

Hold on so

Deusovi

if you have an arrow going ↘ and one going ↓, both being the same length

which one is taller

bobble

how do you type arrows in chat?

North Læraðr

the ↘ because of the pythogorean theorem?

merrybot

if taller = height, then the one going down because the diagonal one is, well, diagonal

Deusovi

03:50

"taller" is "height" here - their lengths are the same

draw a picture. pictures help

North Læraðr

So their verticle velocity remains the same

Deusovi

explain?

North Læraðr

No I was asking for clarification

Deusovi

you already agreed that the magnitude of the two was the same

that's the length of the vector, ignoring its direction

North Læraðr

Oh...

cries

merrybot

03:52

image:

Deusovi

and you're looking to determine which vertical velocity is bigger - that's how "tall" they are, ignoring any horizontal width

merrybot

the vertical one is taller

North Læraðr

Oh, because of the pythagorean theorem?

merrybot

no, because the other is rotated

Deusovi

or because of the "looking at it"

2

(yes, the pythagorean theorem is one way to justify that formally, but i don't think it's necessary to)

merrybot

03:53

for determining height, ignore width

North Læraðr

Ohhhhh

Since it's slanted

It has less verticle height

Deusovi

right, the vertical component is just the height, ignoring the width

so the turned arrow will be less tall

merrybot

yes

Deusovi

@bobble I have a custom keyboard shortcut file with shortcuts for all sorts of things - Greek, Russian, Japanese, IPA, math symbols, arrows, chess pieces...

merrybot

@Deusovi wowwww

North Læraðr

03:54

Sorry it's 8:53 here and I came from a two hour marching band (social distanced, of course) so my brain is not functional

Deusovi

whoops wrong response

merrybot

just to reiterate

North Læraðr

ahhhh

merrybot

special thanks to google drawings

North Læraðr

But the magnitude (speed) is the same because they were both launched at the same velocity

Even when falling...?

merrybot

03:57

yes

exatly

North Læraðr

At different angles? Okay

Deusovi

yep! because of conservation of energy

Ankoganit

@NorthLæraðr *same speed, not velocity

North Læraðr

Right.

Different velocities

merrybot

speed is how fast
velocity is how fast and in what direction

the difference is important

Deusovi

03:58

if they're both at the same height, they have the same potential energy change. since they started at the same kinetic energy, they must also have the same kinetic energy at the end

North Læraðr

At the peak, are both verticle velocies zero?

merrybot

@Deusovi yep

@NorthLæraðr yep

North Læraðr

Okay, just double checking

merrybot

because it is the peak

if you make a curve of the height, and zoom in on the peak,it will eventually look like a straight horizontal line, slope = 0

North Læraðr

Okay, so since the ball launched at an angle has a smaller vertical velocity, it'll reach its peak more quickly than the one thrown upwards, right?

merrybot

04:01

nnnnno

North Læraðr

what...

bobble

I think you're right, North

merrybot

they launched at the same speed

Ankoganit

@merrybot wait why not

merrybot

uh hmm

what i meant by "zoom in on the peak" earlier

so uh hope that helps @north

North Læraðr

04:07

No it really doesn't. You'd need to compare when the angled throw reaches its peak compared to when the thrown up reaches its peak

merrybot

hmm

... maybe this tea will help me think properly sip

when's all this due btw?

North Læraðr

Tonight

Assigned today

Ugh

merrybot

shit

North Læraðr

No I think I'm right. Look at this graph

Or I'll describe

In a velocity vs time graph, since Jim (straight up throw)'s velocity vector is higher... wait no hold on

Yeah yeah

Deusovi

yes, the one with a shallower angle will reach its peak first

North Læraðr

04:11

So in a velocity v.s. time graph comparing the vertical vector, Jim's velocity is placed higher

Deusovi

easiest way to see that is to consider the extreme case - if you throw it directly to the right

then it's at its peak instantly!

merrybot

right right (no pun intended)

hmm

this problem is Puzzling™

North Læraðr

04:31

Okay last question

"A daredevil is shot out of a cannon at an angle of 45o with an initial speed of 25 m/s. A net is positioned at a horizontal distance of 50 m from the cannon. At what height above the cannon should the net be placed in order to catch the daredevil?"

I already solved that the daredevil will travel 67 meters if there is no net

Like his trajectory

But now I'm stuck

Wait the horizontal range is just total horizontal distance right?

bobble

at 50m, how high is the daredevil?

North Læraðr

Uh...

That's what I'm trying to figure out :P

bobble

displacement curve, you know a (=g), v_0 (from trig and initial speed), and t (from x distance), solve for delta-y

North Læraðr

The total distance is 63* made an error

wait... how did you get time?

bobble

find how long it takes daredevil to travel 50m

North Læraðr

04:38

ohh x=v_0*cos(theta)*t

I was going about it wrong

11 meters!

sigh of relief

bobble

you feel smart now?

North Læraðr

Thanks a lot, you guys are SO AWESOME :))))))

@bobble Hell yeah I do :P

Thank you to @merrybot @bobble @Deusovi and @Ankoganit for taking your time out to help me out. Greatly appreciated :)

Wait until I have my PreCalc review (shivers).

bobble

I spent an hour tutoring people from my school today - it's really nothing to send a few messages to point you in the right direction

Sphinx

05:43

0

Q: Wordmorphs In Space!

The year is 21XX. Space tourism is easy and affordable. You decide to spend your next vacation hopping from planet to planet, hanging out with aliens and so forth. To that end, you rent a WordMorphian spacecraft. WordMorph is a propriety technology of Hasbro-Telsa that uses the power of words to ...

word-ladder

Sphinx

06:32

0

Q: Three way duel, which guns to choose?

Alice, Bob and Carole are involved in a game of three way duel. They take turns to shoot in the order of Alice-Bob-Carole-Alice-... until only one surviver is left standing. The rule is very simple: in your turn, you must fire one shot at another opponent of your choice. If you hit, your target i...

mathematics strategy probability game game-theory

Sphinx

06:57

0

Q: Find the missing value in the given figure

Find the missing value value in the given below figure Choose the correct option : (a) 22 (b) 34 (c) 36 Could anyone give me hint to crack the logic in this figure to get the missing value? I tried a lot but didn't get luck.

logical-deduction calculation-puzzle

Sphinx

10:16

1

Q: abc+def=ghi {using numbers 1-9 only once)

Math question, that I don't know how to begin solving... You must use digits 1-9, only once. Is there an easy formulaic way of answering this? ABC + DEF = GHI

mathematics combinatorics

0

Q: Social Distancing L-Game

This is a variation of Edward De Bono’s famous L-game, but played on a 5x5 board (instead of 4x4) with social distancing rules in place. More specifically, two players (Blue and Orange) take turns moving according to the following rules: (mandatory) Move their L-piece to a new location, not occu...

game

oAlt

11:39

@NorthLæraðr oh no, Physics. I loathe the subject (though I still hate Research the most). I think I have a problem with the application of the concepts, and some of them are not intuitive at all.

I backread and oh, no. Even more physics.

I should not have made that my core subject (I don't know what it's called for you guys, but it's one's "main"/"major"??? science subject (I'm also STEM-ing)). Anyway, yeah, in general it was anything but easy for me at all.

Ankoganit

12:00

@oAlt Wait is Research a subject?

or are you saying you just dislike research in general?

oAlt

@Ankoganit our school does have a Research subject

Ankoganit

oh

huh

what is that about?

oAlt

Wait imma just pull something up verbatim

Students tackle "real life and/or academic problems they are interested in, come up with creative and innovative solutions, and implement these solutions applying the scientific process."

Ankoganit

This sounds like one of those well-intentioned things that are incredibly easy to botch in practice

oAlt

Nope definitely not

And that's why I hate it, cuz it's too difficult

Ankoganit

12:13

ouch

oAlt

Wait, I didn't understand something. Whoops

@Ankoganit it IS easy to botch, and hard to even get it decent. That's what I meant.

And THAT'S why I hate it, cuz it's too difficult.

Ankoganit

I see

Sphinx

14:24

1

Q: Cryptic Family Reunion: Belt it out

The answer to this puzzle is a list of ten thematically related words or proper names or phrases. Each of these is clued cryptically, and the theme is to be determined. In this puzzle, the order of the answers is significant, and determining this significance is part of the puzzle. Since the defi...

knowledge cryptic-clues

bobble

@oAlt My school has a class like that, and it's pretty popular because you do a bunch of fun experiments and have no homework. Except for this semester, when you do no fun experiments.

bobble

14:42

Oh hey there North :)

North Læraðr

Heya

@oAlt Oh, AP Research and Seminar? I wish our school offered that :/

@bobble So... are you a MLP fan?

I had to look up what an alicorn wad

bobble

no, I was more into Dora as a little kid

There's a book series I really like (Keeper of the Lost Cities) which has alicorns in it

North Læraðr

ah

I was a power rangers kid :P

matt

hello everyone

North Læraðr

heya

bobble

14:51

matt, we have a very important questions: what media did you like as a little 'un?

matt

"media" meaning what, exactly?

bobble

TV show, movies, books, etc.

matt

alright then um... basically anything w/ stephen hawking and/or neil degrasse tyson

(yes I was a bit of a space nerd then, and now)

hey ankoganit :)

bobble

shall we ask ankoganit for their little-kid loves?

matt

uh sure

i guess

Ankoganit

14:55

hi

@bobble hm?

bobble

I liked Dora, North liked power rangers, and matt liked space

(as little kids)

matt

> ankoganit, we have a very important questions: what media did you like as a little 'un?

North Læraðr

@bobble Oh, I also liked Animal Planet

Ankoganit

Phineas and Ferb!

kristinalustig

@Deusovi I spent several hours last night working on that big 8-grid puzzle you linked. Barely made it anywhere. -_-

Deusovi

14:58

I did warn you.

bobble

@Ankoganit My experience with that show was when adults turned it on and were like "this is a cartoon, so you will like it". I didn't, just to be contrary. Maybe I should give it a second chance.

North Læraðr

@bobble I liked that show

Ankoganit

Matter of taste I guess

matt

@bobble revenge

bobble

but matt, we're in the NPG together!

North Læraðr

14:59

Wait is Ankoganit in the NPG?

Ankoganit

@bobble Tbf now-me isn't entirely sure why it liked it: each episode is exactly the same

kristinalustig

@Deusovi did you attempt it at all? I have a big clarifying question but I don't think I can really comment on a 10-year-old blog post. I can't tell if the Nurikabe is going to have all of the same shaded squares as the kuromasu PLUS some, or if they're totally different. Any ideas

Deusovi

(IMO phineas and ferb is a decently funny show, even if you're not a kid. there are lots of jokes aimed at adults that aren't just "haha look at this innuendo", and there's also a pretty good amount of meta-humor that legitimately lands well)

Ankoganit

Agreed

Deusovi

> The solution to the Heyawake puzzle and the Kurodoko puzzle are identical.

Ankoganit

15:01

@NorthLæraðr Don't have a particularly strong opinion on pickles, I'm afraid

North Læraðr

@Ankoganit Hmmmm (squints)

kristinalustig

@Deusovi Right, I know that, but my question still stands, since the nurikabe and kurodoko are overlayed on top of each other

Deusovi

I believe the two should have exactly the same shaded squares

matt

@Ankoganit yeah it's like "let's make a random thing and then lose the platypus and get the whole city temporarily confused"

kristinalustig

@Deusovi hmm, well, they can't, right, because in the kurodoko all the "islands" must connect and in the nurikabe they cannot by design

unless i'm fundamentally misunderstanding something

Ankoganit

15:02

@matt basically, yes

bobble

it's really confusing to have two conversations happening in the same room

Deusovi

right, I think it's meant to be that the "Kurodoko" is just Kurodoko-style clues inside the Nurikabe islands, and the Kurodoko connectivity/adjacency rules don't apply? that's how I read it, at least

North Læraðr

@bobble It's like three conversationss

matt

@bobble yes

Ankoganit

@matt It's still pretty funny, but I don't think I got even half of those as a kid, which makes me wonder why I liked it back then

kristinalustig

15:04

oh, interesting. that's a totally different interpretation than I had. I'm gonna tackle the puzzle with that interpretation and see where I get. Thanks friend!

matt

@Ankoganit yeah

Ankoganit

Also I suspect P&F is the reason most people know the word 'aglet'

bobble

well, I don't know "aglet", but then I didn't pay attention to P&F

North Læraðr

@bobble Same

bobble

polling anyone who's solved on of my around-the-bends: would it be terrible if there was a four-letter word (2 & 2) in the grid?

North Læraðr

15:11

Yes

bobble

drats

North Læraðr

lol

Sphinx

0

Q: Find the hat colors - Riddle 2

After the previous riddle I asked was resolved so quickly, I propose you another self-created hat-guessing riddle. This time it is slightly more difficult, good luck! TASK: You have to guess which ones are wearing green hats and which ones are wearing black: DESCRIPTION: Each one can see 2 hats,...

logical-deduction meta-knowledge hat-guessing

0

Q: My prefix will despite a fact, My infix will negatively react

My prefix will despite a fact My suffix tells what to do instead My infix will negatively react My whole is an idea in your head

riddle word rhyme

North Læraðr

15:31

@bobble The CC I was working on, if you wanna try solving it :)
CC: Softly sleep around a glamour (5)

matt

I have no idea how to even start that

(and I'm not the best at CCs anyway)

bobble

"softly" could be P.... but I can't think of a word meaning "glamor" that starts with P

matt

PRESTIGE but that's 8

and then there's the "around a"

bobble

I'm sure Deus would solve it in 5 seconds flat

matt

always does

can we assume the answer isn't NORTH? :p

bobble

15:40

NORTH could make a nice ddef

Direction puzzler (5)

matt

ah yes

bobble

could be better

matt

it seems I'm good at making cryptics but not solving them (cf. my Evil circles thing)

@bobble how long did that take to think of?!

bobble

15 minutes? I decided on my def and answer, split up the answer into wordplay components, and then just strung them together.

matt

hm

"evil circles" took about 10 mins, did the same thing

yes @matt = @merrybot

kristinalustig

15:50

@NorthLæraðr the closest I can get is... poorly spelled PIZAZZ - softly is p, sleep is zzz, and it's around a, and means "glamour"

dunno where the i is from though :D

matt

hmm

North Læraðr

16:16

@kristinalustig That's spelled PIZZAZZ

@kristinalustig Close. It's spelled alternatively as PZAZZ

You don't need the I :P

kristinalustig

i... can't tell if you're being serious

North Læraðr

I am dead serious right now

kristinalustig

the answer is pzazz?

North Læraðr

@kristinalustig Yup

kristinalustig

lol i have NEVER seen it written like that. but! go me, i guess? :P

matt

16:23

well um

North Læraðr

The more you know

Scrabbletm

North Læraðr

17:52

ok, so I'm almost positive the def is "ALICORN" with like (7-letter word for mythical) winged horse with a horn

Maybe like fantasy?

Avi

Pegasus with a horn

but i don't know if that's ok lol

North Læraðr

Doesn't fit the pattern

It's literally (mythical) WINGED HORSE WITH A HORN

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