## Empty one year ago Anyone know any problems that are "easy to understand but impossible to solve"? Like Goldbach's conjecture or Fermat's last theorem for instance.

1. hhopke

You may have tried this but have you googled "unsolved theorems?"

2. hhopke

Also, FLT was solved in 1996.

3. Empty

Haha well that's true, but I didn't mean it literally. I could google up unsolved problems, but I wanted to find some that other people had come across that maybe we could try to think about and try to solve together rather than alone.

4. nincompoop

ya the unsolved mysteries about aliens and how the american government is trying to keep it from us

5. imqwerty

I've got 1 but before that u need to give me the best defination of sonic boom.

6. Empty

Haha I don't know what the best definition of a sonic boom is, I think it relates to going faster than the speed of sound and somehow creates a shockwave by displacing air or something fancy lol

7. imqwerty

Ok now the question is - why doesn't light create sonic booms?? ¿¿

8. Astrophysics

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9. nincompoop

light does not make sonic booms, because by definition sonic = sound

10. hhopke

Got one: Question: Five pirates are parting ways after finding a treasure of 100 pieces of gold. The pirates decide to split it based on a vote. Each pirate, from oldest to youngest, gets to propose a plan on how to split the gold. If at least 50 percent of the other remaining pirates agree on the plan, that is how they will split the gold. If less than 50 percent of the pirates agree, the pirate who came up with the plan will be thrown overboard. Each pirate is smart, greedy, and wants to throw as many others overboard as possible without reducing the amount of gold they get. What plan can the first (oldest) pirate propose to live and get as much gold as possible?

11. nincompoop

12. imqwerty

I didn't get that @nincompoop

13. nincompoop

ya don't focus on the redshift LAUGHING OUT LOUD but sonic = sound

14. Empty

oooh good questions @hhopke and @imqwerty and... hahaha you too @Astrophysics :'(

15. imqwerty

I've got 1 more wait

16. nincompoop

do not focus on the word use, but instead on the mechanism doppler effect is a characteristic that both sound and light produce. less focus on the word, but more on mechanics and equation

17. Empty

I am looking in my differential equations book since I remember shockwaves came about from solving with the method of characteristics or something.

18. nincompoop

there are some phenomenon that the english language or other language cannot describe properly

19. Empty

yeah like things that aren't particles or waves... :P

20. nincompoop

laughing out loud

21. imqwerty

I think i must learn about redshifts nd ol nd then come here to debate.

22. imqwerty

qwerty made a uniform spherical magnet. Where are the poles of that magnet located??

23. nincompoop

use ferromagnetic metal

24. nincompoop

metal sheet

25. nincompoop

magnetism ftw

26. Empty

hahaha the poles are on the outside and center?

27. nincompoop

isn't this what gauss proved?

28. imqwerty

Prove that u can make an A4 size paper reach mounteverset's top with one end of the paper touching the groung nd the other end at the top. U can tear the paper.

29. Empty

well, tear a piece, leave it on the ground, then take the other piece to the top of the mountain lol.

30. hhopke

Well played...

31. imqwerty

U can't tear the paper nt even a bit

32. imqwerty

Nd the mounteverset is the real mounteverset nd nt a plastic toy or drawing.

33. imqwerty

Ik the answer to this one :)

34. nincompoop

can we use magnetic flux on that sphere magnet pole problem?

35. imqwerty

36. hhopke

Wait- do they have to be on the ground and at the top at the same time?

37. hhopke

Could we use tesseracts? Like from a wrinkle in time?

38. Empty

Ooooh explain that that sounds cool

39. Empty

I was just going to do something like cut the paper like this: |dw:1437979349526:dw|

40. nincompoop

no cutting nor tearing

41. Empty

ok ok crap

42. nincompoop

use tangent ratio

43. Empty

Well technically the top of mount everest is the ground at that point... XD

44. nincompoop

|dw:1437979534544:dw|

45. nincompoop

|dw:1437979584308:dw|

46. hhopke

|dw:1437979492646:dw| Theory of tesseract idea.

47. nincompoop

what's up with the tessarat?

48. hhopke

The concept was bending the universe and everything in it to make the distance between point a and point b shorter.

49. nincompoop

okay he said we can tear the paper

50. hhopke

|dw:1437979662627:dw|

51. nincompoop

then tear the paper about the size of an atom and then line them up HAHA

52. nincompoop

hmm can we calculate this? HAHA now I am interested

53. nincompoop

how many atoms are there in an A4 paper

54. nincompoop

figure out the dimensions and assume that the paper is made of carbon (primary)

55. Empty

Cool I have thought of a similar concept to this tesseract thing; what if nothing moves but instead space just changes? I guess in a sense this already happens, that's what the metric tensor describes in general relativity. :P

56. hhopke

I have to go. Will check back in the morning to see what is eventually figured out. :)

57. nincompoop

ya I thought of relativity but wouldn't everything stretch including the mountain?

58. nincompoop

stretch = turn red LAUGHING OUT LOUD

59. nincompoop

use a miniature mteverest

60. imqwerty

No u can't use tessaract ol u have is power nd brain power nd the paper use these thinga to get the paper to top

61. Empty

Yeah or we could model it as being made up of cellulose like the sugar monomer length whatever that is

62. nincompoop

he said "prove" and I say perform an experiment

63. imqwerty

the paper is an ordinary paper which can be found in your notebooks :)

64. Empty

Also I was looking into this: Cherenkov radiation is the light analog of a sonic boom.

65. nincompoop

sounds like something I never learned

66. Empty
67. nincompoop

explain this: is electromagnetic radiation emitted when a charged particle (such as an electron) passes through a dielectric medium at a speed greater than the phase velocity of light in that medium

68. imqwerty

u all will be like ( ͡° ͜ʖ ͡°) after seein the answer

69. nincompoop

phase velocity of light in the medium

70. nincompoop

ohhhh nvm

71. nincompoop

tell us, qwert

72. nincompoop

be mindful that I might chop you into pieces

73. Empty

74. Empty

lolol I am imagining qwerty sweating over there haha XD

75. nincompoop

I am curious about the sphere magnet's poles too because Ive only done flux on spheres with physics |dw:1437980486187:dw|

76. nincompoop

terrible drawing

77. imqwerty

ok ( ͡° ͜ʖ ͡°) the thickness of the paper is about 1^(-3) m or even less so when we fold the paper half the thickness doubles ( ͡° ͜ʖ ͡°) now if we keep foldin the paper half nd half nd half about 2^16 times then the thickness of paper will be = 1/(-3) x 2^16 m which is even greater than height of mount everest ( ͡° ͜ʖ ͡°)

78. nincompoop

|dw:1437980547551:dw|

79. nincompoop

same concept as cutting into atomic size

80. imqwerty

i've prepared my swords

81. Empty

So basically we can do it if we ignore certain laws of physics lol

82. nincompoop

ya

83. nincompoop

this kid did not even acknowledge our answer that it is the same concept

84. nincompoop

I got the ears and eyeballs I want to stir fry them

85. imqwerty

yes!! all u had to do ws- prove ur answer theoriticaly nd ur method should be simple ( ͡° ͜ʖ ͡°)

86. nincompoop

o ya my method is theoritcally and can be solved

87. nincompoop

carbon atom's radius is 67 pm

88. nincompoop

we can assume the volume of the paper

89. nincompoop

by its volume, we can estimate how many atoms are present

90. nincompoop

|dw:1437980893036:dw|

91. imqwerty

so we are assumin that the paper is made of C s so we can take the mass of Na atoms of C = 12gm ??

92. nincompoop

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93. nincompoop

94. nincompoop

LAUGHING OUT LOUD

95. imqwerty

mass of a sheet of A4 paper = 4.5gms molar mass=12 moles=4.5/12 no of atoms =2.25 x 10^23 diameter of each atom=134pm so ASSUMING that all atoms are in line so MAXIMUM length of the paper = 2.25 x 10^23 x 134 x 10^-12 =2.25 x 134 x 10^11 m omg yes nin is also correct ( ͡° ͜ʖ ͡°) but u can't calculate this^ thing by volume ( ͡° ͜ʖ ͡°)

96. nincompoop

I was going to look up density of paper LAUGHING OUT LOUD

97. imqwerty

lol i ws also goin to do that but then i thought that i wuld have to multiply it with the volume so it wuld be a tedious task so i directly looked up for the mass ( ͡° ͜ʖ ͡°)

98. Empty

We could have dissolved the paper, thereby not tearing

99. nincompoop

HAHAHA

100. nincompoop

are there any applications for directrix?

101. hhopke

Gathering of the geniuses. Just saying. :)

102. imqwerty

Lollipop

103. imqwerty

^the reason why i hate autocorrect.... *LOL

104. Empty

Hahaha

105. imqwerty

If IF time machine gets invented then what do u think will happen?

106. Empty

Hmmm well when I was a kid I told myself if time travel is real I'll put a key here from m future self, but I never found the key so I guess it won't happen.

107. imqwerty

So u putted the key so that one day when time machine gets invented u can bring back the key to time when u placed the key there. Right?

108. Empty

Hahaha well no, but that's a good point, where would the key end up and where did it come from?

109. imqwerty

I think that future time travelling is more likely to happen as compared to goin to past

110. Empty

Yeah I mean we all travelled from yesterday to today so we already do that anyways :P

111. imqwerty

I mean going to future with respect to other people

112. Empty

113. imqwerty

Well my hobbie is to think so while thinking i thought that y doesn't light makes sonic boom.

114. Empty

Cool :)