Deepest Hole In The World

  • #1
Hi,

just saw an documentary about "the deepest hole in the world" on NG:
<link to video deleted>
Can anyone tell what it is, and what is the exact quotation to determine the height
(with fricton stone-pipe)
 
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Answers and Replies

  • #2
davenn
Science Advisor
Gold Member
9,435
8,338
Hi,

just saw an documentary about "the deepest hole in the world" on NG:
<link to video deleted>
Can anyone tell what it is, and what is the exact quotation to determine the height
(with fricton stone-pipe)
hi there,
welcome to PF

Sorry but I have a lot of problems believing that video. I suspect some of the sound effects have been added

here is a wiki link to that is the deepest borehole drilled

https://en.wikipedia.org/wiki/Kola_Superdeep_Borehole


so, if nothing else, the title of that video is false for a start


cheers
Dave
 
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  • #3
14,358
11,671
Hi,

just saw an documentary about "the deepest hole in the world" on NG:
<link to video deleted>
Can anyone tell what it is, and what is the exact quotation to determine the height
(with fricton stone-pipe)
Never, ever was this a fall of about 12km.
Edit: Seems to be a new record on how fast Murdoch ruined a once excellent tv channel.
 
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  • #4
olgerm
Gold Member
472
26
Never, ever was this a fall of about 12km.
If you not to consider resistance forces (like air resistance), then
##h=v \cdot(t + \frac{v}{g}- v \cdot \sqrt{\frac{1}{g}\cdot(\frac{1}{g}+\frac{2\cdot t}{v})})≈4100*m≈4*km##
where:
  • h is depth of hole h≈4102.3*m
  • t is time from droping stone until hearing the the stone hit somebody t≈41*s
  • g is gravitational acceleration g≈9.8*m/s2
  • v is speed of sound v≈340*m/s
It is quite bad approximation, because the stone surely did not go break sound barrier. Real depth is smaller.
video sound may be fake.
 
  • #5
DrClaude
Mentor
7,551
3,892
Fake video. Thread closed.
 

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