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Mt. Frank Member
Joined: 17 Jan 2002 Posts: 46 | TRs | Pics Location: Renton, WA |
Isn't it strange that we huff and puff and fight gravity for hours to get to the top of a mountain, yet taken at the same scale, the earth is smoother than a billiard ball?
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roughing it Guest
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roughing it
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Sat Mar 15, 2003 3:47 pm
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catwoman Member
Joined: 16 Dec 2001 Posts: 888 | TRs | Pics Location: somewhere near Tacoma |
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catwoman
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Sat Mar 15, 2003 5:29 pm
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roughing it Guest
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roughing it
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Sat Mar 15, 2003 7:53 pm
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Actually I think it was my old hiking boots that made me feel that way. My new boots cruise over everything and hiking a trail now is like a hot knife through butter.
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catwoman Member
Joined: 16 Dec 2001 Posts: 888 | TRs | Pics Location: somewhere near Tacoma |
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catwoman
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Sat Mar 15, 2003 11:15 pm
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My question was directed to Mt Frank.
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Mt. Frank Member
Joined: 17 Jan 2002 Posts: 46 | TRs | Pics Location: Renton, WA |
Do the math. Mt. Everest ~29,000 feet, diameter of the planet ~8,000 MILES.
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catwoman Member
Joined: 16 Dec 2001 Posts: 888 | TRs | Pics Location: somewhere near Tacoma |
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catwoman
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Sun Mar 16, 2003 6:10 pm
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Rich Baldwin Mister Eddie
Joined: 22 Dec 2001 Posts: 1686 | TRs | Pics Location: Martinique |
OK, I did the math. Using Mt. Frank's numbers, Everest represents a .07% variation in the diameter of the planet, or .14% of the mean spherical radious. If the earth were a billiard ball (roughly 2 inch diameter), the variation would be about 1.4 mils, which is pretty rough finish for a billiard ball.
Was you ever bit by a dead bee?
Was you ever bit by a dead bee?
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Stefan Member
Joined: 17 Dec 2001 Posts: 5084 | TRs | Pics
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Stefan
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Wed Mar 19, 2003 11:31 am
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Rich Baldwin wrote: | OK, I did the math. Using Mt. Frank's numbers, Everest represents a .07% variation in the diameter of the planet, or .14% of the mean spherical radious. If the earth were a billiard ball (roughly 2 inch diameter), the variation would be about 1.4 mils, which is pretty rough finish for a billiard ball. |
Does that take into consideration if the oceans were void of water?
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Mt. Frank Member
Joined: 17 Jan 2002 Posts: 46 | TRs | Pics Location: Renton, WA |
Thanks Rich - My calculations came out to .0017" on a 2.50" ball. I believe the manufacturing limits for something like a billiard ball is about +/- .002". And no, I did not drain the oceans.
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polarbear- Guest
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polarbear-
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Wed Mar 19, 2003 9:11 pm
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I was playing billiards last night, and most of the balls were going way off course. Is that due to the .0017" or something else? It seems like the white ball is worse than the other balls.
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Rich Baldwin Mister Eddie
Joined: 22 Dec 2001 Posts: 1686 | TRs | Pics Location: Martinique |
Geek explanation: +/- .002 is probably the fabrication tolerance on the diameter, not the surface finish. It might also apply to the sphericity (max. diameter to min. diameter - the ball won't be perfectly spherical). Surface roughness would be specified in microinches, not mils.
Was you ever bit by a dead bee?
Was you ever bit by a dead bee?
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