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Whirlpool
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Whirlpool
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2013-May-24,
06:43 AM
grapes
replied to a thread
How practical is beach soccer?
in
Off-Topic Babbling
Sorta Here's a link that deals wih last month's sixth annual world cup of quidditch: http://worldcupquidditch.com/
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13 replies | 133 view(s)
2013-May-23,
10:19 AM
grapes
replied to a thread
Salem/Dallas Oregon, Activity
in
Geology & Planetary Surfaces
A 1.5! North Carolina was thought to be geologically inactive, then they bid for the superconducting supercollider, and installed a seismic...
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3 replies | 96 view(s)
2013-May-23,
10:15 AM
grapes
replied to a thread
How practical is beach soccer?
in
Off-Topic Babbling
Or quidditch, played on many campuses
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13 replies | 133 view(s)
2013-May-21,
10:03 AM
grapes
replied to a thread
how do i have all my topics/posts deleted and username removed?
in
Forum Introductions and Feedback
We try. I can remember one poster who signed his full name to his initial post. The post was high enough quality that I was certain he'd be around...
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22 replies | 1212 view(s)
2013-May-21,
08:12 AM
grapes
replied to a thread
Mechanical advantages of rails?
in
Science and Technology
It's hard to imagine an alternative steel factory without some sort of rail system--you're not going to shuttle hot ladles back and forth on rubber...
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53 replies | 731 view(s)
2013-May-20,
03:58 AM
grapes
started a thread
SPF ratings for sunscreens
in
Small Media at Large
From USA Today today: http://m.usatoday.com/article/news/2325341 OK I might believe that SPF ratings are gimmicks, as the article says, but I'm...
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8 replies | 160 view(s)
2013-May-20,
03:00 AM
grapes
replied to a thread
Looking for a solid pair of binoculars
in
Astronomical Observing, Equipment and Accessories
The last two links are the same.
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11 replies | 444 view(s)
2013-May-19,
06:48 PM
grapes
replied to a thread
Machines in space
in
Science and Technology
Nobody else may have mentioned the effect of cosmic rays on computers and digital cameras, but that sure seems like an issue. Modern machines have a...
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36 replies | 1825 view(s)
2013-May-19,
10:12 AM
grapes
replied to a thread
Mechanical advantages of rails?
in
Science and Technology
Simple physics and material strength allows one to calculate number of wheels. A single coal car carries a small hill of rock. (...
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53 replies | 731 view(s)
2013-May-17,
08:43 PM
grapes
replied to a thread
Really trivial stuff that bugs you
in
Off-Topic Babbling
Spouse -- Spice Trousers -- Taser Douse -- Dice Souse -- Sots
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2582 replies | 78544 view(s)
2013-May-16,
06:43 PM
grapes
replied to a thread
What is the Average Distance Between Earth and Sun?
in
Astronomy
If it is given as 93,000,000 miles, there are two significant digits--it's been rounded to 93 million. Of course, it's 91.5-94.5 million over the...
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23 replies | 486 view(s)
2013-May-16,
10:08 AM
grapes
replied to a thread
Really trivial stuff that bugs you
in
Off-Topic Babbling
Interesting. The wiki says it is folk etymology. From http://www.navy.mil/submit/display.asp?story_id=11795 That ship may have sailed! :)
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2582 replies | 78544 view(s)
2013-May-15,
04:20 PM
grapes
replied to a thread
About Venus
in
Astronomy
OK, that clears that up. The phrase "null hypothesis" is too general and actually controversial. Why not just say, Hypothesis A, Hypothesis B,...
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18 replies | 355 view(s)
2013-May-15,
04:11 PM
grapes
replied to a thread
What is the Average Distance Between Earth and Sun?
in
Astronomy
I think that was their point! :) There is some justification for using the semi-major axis as the average distance, as we've said, and the...
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23 replies | 486 view(s)
2013-May-15,
12:39 PM
grapes
replied to a thread
About Venus
in
Astronomy
Not just superficial resemblances, either, but as Shaula mentions, in the DNA as well. Too? What are you calling the null hypothesis? :)
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18 replies | 355 view(s)
2013-May-15,
03:36 AM
grapes
replied to a thread
What is the Average Distance Between Earth and Sun?
in
Astronomy
Like Glom, I'd say yes. Aphelion plus perihelion equals major axis, so half of that is the semi-major axis, and Kepler's laws depend upon the...
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23 replies | 486 view(s)
2013-May-14,
04:25 PM
grapes
replied to a thread
Lagrange point with a mass, does it create baby L-points?
in
Space/Astronomy Questions and Answers
But isn't the moon of appreciable size? Or, going back to the OP, substantial enough? The moon is large enough, relative to the earth, that some...
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14 replies | 284 view(s)
2013-May-14,
02:21 PM
grapes
replied to a thread
Really trivial stuff that amuses you...
in
Off-Topic Babbling
Yesterday, some kids asked which languages I knew. I claimed an additional ability to speak British, and they were impressed, until I admitted it...
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1572 replies | 54324 view(s)
2013-May-14,
10:23 AM
grapes
replied to a thread
Lagrange point with a mass, does it create baby L-points?
in
Space/Astronomy Questions and Answers
Putting in a second moon into the earth/moon system would not put you over the 1/25 limit.
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14 replies | 284 view(s)
2013-May-12,
07:53 PM
grapes
replied to a thread
Lagrange point with a mass, does it create baby L-points?
in
Space/Astronomy Questions and Answers
L4/L5 are stabile when the large mass is 25 times as massive as the smaller mass. The earth is 80 times the mass of the moon. So, when you say...
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14 replies | 284 view(s)
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