From Throwing Rocks to Dropping A-Bombs
Oct 11, 2018 12:22:27 #
I have forgotten where, but milions of years ago a large space rock (forgot official name) collided with earth somewhere in SW Northwest America. Did it cause the dinosaur die-off.
Oct 11, 2018 12:51:19 #
In the fifth grade an unfriendly spat put me on the losing end of a rock fight. I ended up with a smallish rock (1-2")meeting the end of my nose. I guess I was lucky in that my eyes were spared but the cartilage was shattered. Even after some corrective surgery I started to snore loudly.
Stephan G wrote:
Just think of the size of slingshot would be needed. Were it not for the Chinese and gunpowder, we might have built more efficient rock hurlers. Just look at the trebuchets! :sm02
For free-fall objects, there is the need for work-energy to get the rocks up in the air.
For free-fall objects, there is the need for work-energy to get the rocks up in the air.
Oct 11, 2018 14:17:40 #
DirtFarmer wrote:
Old science fiction story (Asimov? Don't remember the name of the story offhand.)
In a war between the moon and the earth, the moon threw rocks. Escape velocity from the moon was significantly lower than from the earth so the energy investment was fairly low and rocks are abundant.
The moon won.
In a war between the moon and the earth, the moon threw rocks. Escape velocity from the moon was significantly lower than from the earth so the energy investment was fairly low and rocks are abundant.
The moon won.
Robert Heinlein, The Moon Is A Harsh Mistress. Mike (the self aware computer) said "We can through rocks Man, we will," Great book for those who haven't read it.
Oct 11, 2018 14:46:09 #
Oct 11, 2018 15:00:16 #
GeneS
Loc: Glendale,AZ
Looks to me it is in the general chit-chat forum.
Guess I don't know what general chit-chat is.
Guess I don't know what general chit-chat is.
ELNikkor wrote:
Uh, and did you forget to mention the cameras and lenses that recorded the incident? or, are you in the wrong forum?
Oct 11, 2018 15:02:38 #
andesbill wrote:
Remember the dinosaurs. Now that was a big rock.
BIG ROCK - Estimated to be six miles across; impacted the earth at between 10-20 MPS.
Oct 11, 2018 15:09:29 #
andesbill wrote:
Remember the dinosaurs...
I may be old, but I'm not THAT old
Oct 11, 2018 17:19:48 #
Stephan G wrote:
Just think of the size of slingshot would be needed. Were it not for the Chinese and gunpowder, we might have built more efficient rock hurlers. Just look at the trebuchets! :sm02
Seriously, we had several physics classes in which we had to work out the worst case scenario for a descending rock to Earth. There are so many aspects to consider. Meteorites are not exactly free-fall objects.
For free-fall objects, there is the need for work-energy to get the rocks up in the air.
Seriously, we had several physics classes in which we had to work out the worst case scenario for a descending rock to Earth. There are so many aspects to consider. Meteorites are not exactly free-fall objects.
For free-fall objects, there is the need for work-energy to get the rocks up in the air.
However, consider a space based launcher in the asteroid belt.
Oct 11, 2018 17:24:22 #
John_F wrote:
I have forgotten where, but milions of years ago a large space rock (forgot official name) collided with earth somewhere in SW Northwest America. Did it cause the dinosaur die-off.
That one landed in the ocean just north of the Yucatan pininsula, called Chicxulub. And yes, the theory is that it killed off the dinosaurs.
Oct 11, 2018 18:56:18 #
hassighedgehog wrote:
However, consider a space based launcher in the asteroid belt.
Just still the stuff of Science-Fiction.
Oct 11, 2018 20:14:14 #
hassighedgehog wrote:
That one landed in the ocean just north of the Yucatan pininsula, called Chicxulub. And yes, the theory is that it killed off the dinosaurs.
There was an interesting show on the Science Channel that discussed the Yucatan event. Evidently animal life was killed off over several days, and by different methods. Part of them died during the intial impact and explosion, and some died off after the ash started to settle. Evidently the meat eaters outlasted the vegetarians, but they died of lung disease. Evidently, a very complex event.
Oct 18, 2018 12:14:18 #
phlash46 wrote:
another one who hasn't read this forum's title...
Yep, I agree!!
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