/sci/ - Science & Math

post a few top difficulty math ones

>>8347480
Or did you mean the puzzles?

>>8347505
What is the additive identity

>>8347539
>.>
correct.
category, difficulty?

>>8347543
Science 800 idk

>>8347557

>>8347633
What is plastic?

>>8347637
correct, category?

>>8347640
Math

Hardest (idk the number)

>>8347654

>>8347659
What is calculus

>>8347672
correct, category?

>>8347679
Chemistry hardest

>>8347684

>>8347687
What is chaos?

>>8347691
Correct, category?

>>8347687
Not guy who asked question but what is chaos.

>>8347693
Engineering 600

>>8347693
Math second hardest.

>>8347698

>>8347707
Who was Eiffel?

>>8347716
Correct
>>8347699

>>8347725
google

>>8347731
Correct, category?

>>8347738
Biology 200

>>8347757

>>8347765
What is a Dove?

If correct: Astronomy 600

>>8347765

>>8347765
What is squab

>>8347923
>>8347945
Correct, sorry for the wait

>>8348006
What is solar wind?

>>8348058
Correct, category?

>>8348082
Chemistry 2nd hardest

>>8348214

>>8348222
Tungsten

>>8348226
Correct, category?

>>8348239

math nigga, hard.

>>8348226
didn't know they call wolfram tungsten, thx

>>8348250

>>8348270
What is numbers

>>8348270
What is number?

>>8348270

what is multiply?

More math plx

>>8348270
tau/2

>>8348282
correct

>>8348427
forgot my image, sorry for the wait

>>8348432
(four and twenty) / three

>>8348438
correct, category?

>>8348444
math

>>8348448
During a baseball game in Mudville, Case was Mudville's lead-off batter. There were no substitutions or changes in the batting order of the nine Mudville men throughout the nine-inning game. It tured out that Casey came to bat in every inning. What is the least number of runs Mudville could have scored?

>>8348504
Anon, the one above you asked for a math question, not a sport one

>>8348504
13?

>>8348540
nope, there's a smaller answer.
I also require a short proof for these.
>>8348530
Here have another:
With a 7-minute hourglass and an 11-minute hourglass, what is the quickest way to time the boiling of an egg for 15 minutes?

>>8348548
i'm still working on the baseball one but for the hourglass one you need to wait 7+4+11=22 minutes?

>>8348548
boil the egg for 15 minutes

>>8348558
>>8348562
>7+4+11=22 minutes?
That's a solution, but not the optimal one.
Also show how!

>>8348568
set the timer to 7,5 twice

9 runs? 3 runs for every third inning?

>>8348576
How do you set an 11 minute hourglass to 7.5?
> 9 runs?
nope. fewer

>>8348584
you eye ball it

>>8348548
Flip the 11-minute and 7-minute at the same time. When the seven-minute is finished, flip the eleven-minute and boil the egg. When the 11-minute is finished, flip it. When it is finished, 4+11=15 minutes will have passed, and the egg is done.

>>8348654
Wait, no: you can do it in 15 minutes, the minimum. Boil the egg and set both hourglasses. When the seven is finished, flip the eleven, and when that is finished you are done. No solution can be faster because it would take less time than it takes the egg to boil.

Math, hardest.

>>8348548
>>8348562
>>8348568
>>8348576
>>8348584

Start both hourglasses at the same time. When the 7 minute one runs out, you'll have 4 minutes left in the 11 minute one. Start your egg. When the 11 minute one runs out, turn it over. When the 11 minute one is out, the egg has been cooking for 15 minutes.

>>8348656
That's 14 min. Pretty sure
And by math do you want puzzles or more jeopardy questions?

>>8348658
fuck I never thought to delay starting the egg

>>8348684

Set both timers and boil the egg. After the 7 runs out reset it. After the 11 runs out flip the 7. When the 7 runs out 15 minutes should have passed. Pretty sure that's the optimal.

>>8348684
It's fifteen. And, math puzzles sound nice.

MAKE WITH THE JEOPARDY-STYLE MATH QUESTIONS OP.

>>8348713
Correct.
Give me a min for more clues

>>8348548
>Here have another:
>With a 7-minute hourglass and an 11-minute hourglass, what is the quickest way to time the boiling of an egg for 15 minutes?

What's a general form for solving these types of questions?

>>8348756
I don't think there is one. That's the beauty.
Here's another one for whatever algo you want to develope:
How do you measure 9 minutes with a 4min and 7min hourglass?

>>8348734
and for the puzzle, how about a classic:
Three missionaries and three cannibals must cross a river using a canoe, which can only carry two people. But if there are ever more cannibals than missionaries on either shore, the cannibals will overpower the poor missionaries and eat them. There's a strong current so the boat cannot be sent across the river without any people rowing.

>>8348767
Start 4 and 7.
When 4 is out flip both.
When 7 is out flip 4
Let 4 run out.

>>8348767
Set both timers. When the 4 finishes reset it (4 mins). When the 7 finishes (7 mins) flip the 7. When the 4 finishes (8 mins) flip the 7 again and wait till the minute's worth if sand runs out.

>>8348777
youre getting nice digits this evening

and the jeopardy seems really weird, is their something apart from a protractor that measures angles?

>>8347450
Geology for 500 points

>>8348777
Sextant? The etymology seems wrong.

>>8348777

I'm going to post "octant" before checking.

What is an octant?

MAKE WITH ANOTHER MATH QUESTION. ENGAGE WITH YOUR THREAD.

>>8348798
Octant nigs

>>8348803
I'll agree that's right for 1/8.th. Never knew it was a measuring device

>>8348799
>>8348803
correct

>>8348829
Altitude.
More math or linguistics

>>8348777
In diagram form
Left side | Right Side | Boat direction
mmmccc | | ->
mmcc | mc | <-
mmmcc | c | ->
mmm | ccc | <-
mmmc | cc | ->
mc | mmcc | <-
mmcc | mc | ->
cc | mmmc | <-
ccc | mmm | ->
c | mmmcc | <-
cc | mmmc | ->
| mmmccc |

>>8348829
Also did anyone get the 9 minute candle right?

>>8348838
What is

>>8348568
22 is absolutely the optimal solution. The only periods of time when a timer can have finished before 22 minutes are minute 0, 7, 11, 14, 18, 21, and 22. Only 22-7 allows you to measure out 15 minutes.

The method to cook the egg is to run the eleven minute timer twice and the seven minute timer once. Start boiling the egg after the seven minute timer finishes.

>>8348846
It wasn't asked, but burn one candle from one end and the other candle from both ends. When the second candle finishes, burn the other end of the first candle.

>>8348889
See
>>8348787

>>8348894
I meant the hourglass but fucked up.

>>8348897
oh

candle problems are different from hourglass problems

you can understand my confusion

>>8348786
Seems valid

>>8348584
>> 9 runs?
>nope. fewer
That doesn't seem possible. If the first batter pitches in every inning it means you need 9*8+1 or 73 batters at least. Each inning 3 of these batters will get an out, and contribute nothing to the run count, so we can subtract off another 3*9=27. Leaving us with 56 batters. Essentially every 4 batters, a run is scored, which should make the minimum 14, yet I already found a solution for 13 so that can't be right. If you want to get it so that there's less than a run per inning you'd have to arrange it in a very clever way. This kinda reminds me of the 8 queens puzzle.

>>8348940
Seems they don't need a run in the last inning for Casey to bat if he bats first.

>>8348940
So apparently this was a real game.
The solution is 0 runs.
I'll type it out later because theres lots of color.

Thisll prob be it for today. My comp is back to full power

>>8349094
Please do I'm really curious about this.

>>8349099
Actually I just looked it up because I couldn't wait. I knew I was missing some sneaky baseball rule. It turns out if you're at bat while another player gets out stealing a base you will get first at bat next inning. It was the extra piece I needed to actually solve this. Feel free to type out your colorful solution though.

Biology, 304

>>8347450
Can you query this backwards. Can I ask a question and you give an asinine jeopardy answer.

>>8349099
That was indeed an amusing problem concerning Casey and the Mudville nine--amusing, that is, to all save lovers of Mudville. For on the unfortunate day described in your problem, Mudville scored not a single run. This is what happened:

In the first inning, Casey and two of his confreres reached base, but batters four through six struck, flied, or otherwise made out. No runs.

In the second inning, batters seven and eight struck out, let us say, but the Mudville pitcher, to the surprise of all, reached base on a bobbled infield roller. Casey came up to bat, frowning mightily. With the count two and two, the perfidious rival pitcher, ignoring the best interests of poetry, baseball mythology and Mudville, whirled toward first and picked off his opposite number, who, dreaming of Cooperstown and the Hall of Fame, had strolled too far from the bag. THe crowd sighed, Casey glowered, and the inning was over: no runs.

Now as you know, if an inning ends with a pick-off play at any base, the batter who was in the box at the time becomes the first batter next inning. So it was with Casey; once again Mudville loaded the bases; but once again three outs were made with no runs scoring, so that the inning ended with batter si making the last out.

Life may be linear but fate is cyclic: innings four, six, and eight followed precisely the same pattern as inning two (though you may be sure that after his second miscue in the fourth, the Mudville pitcher was lifted and his relief was responsible for only the flood of runs the opponents scored, but for similar cloud-gazing base-paths). And of course, Case led off the fifth, seventh, and ninth innings as he had the third--and again, Mudville would load the bases, but could not deliver (if I remember correctly, the gentlemen responsible for this orgy of weak hitting were Cooney, Burrows, Blake and Flynn). Grand total for Mudville: a goose egg.

Sorry I was unaware of that trick too. Becomes a baseball question.

>>8349172
To make up for it:

Each end of a 10-foot length of rope is tied securely to a man's ankles. Without cutting or untying the rope, is it possible to remove his trousers, turn them inside out on the rope, and put them back on correctly?

Most of these puzzles were taken from Martin Gardner's Colossal Book of Short Puzzles and Problems.

>>8349180
Yes, take one leg of the trousers and move them up through the other leg of the trousers. If you pull all the way through the pants will be turned inside out and can then be worn.