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re: Most Americans don't know the answer to this question
Posted on 4/18/16 at 9:33 am to Knight of Old
Posted on 4/18/16 at 9:33 am to Knight of Old
quote:
Scruffy is right. The question implies an answer for all moons in the universe. There are cases where given bodies gravitational pulls might result in any of the answers A-C (think microgravity, to conceptualize).
2
Posted on 4/18/16 at 10:07 am to Placebeaux
Those bodies actually exert a force on one another, but he moon is much larger and exerts more, so I say C.
The astronauts that walked the moon didn't float off did they?
The astronauts that walked the moon didn't float off did they?
Posted on 4/18/16 at 10:08 am to Placebeaux
frick scruffy, btw.
Posted on 4/18/16 at 10:11 am to Placebeaux
quote:
Engineers responses
Well their responses were understandable. There was no spreadsheet formula to give them the answer
Posted on 4/18/16 at 10:12 am to Placebeaux
At the time of the pen drop, was the Moon a Good Moon or a Bad Moon? If it was a Bad Moon, was it rising?
Posted on 4/18/16 at 10:13 am to horndog
frick horndog, btw.
Posted on 4/18/16 at 10:36 am to SidewalkDawg
quote:
Gravity is the result of mass and distance.
This is true. Gravity is not an attractive force between masses, but is an external pressure force produced by the spacetime curvature. See Einstein's General Theory of Relativity.
Posted on 4/18/16 at 10:44 am to blueridgeTiger
quote:
This is true. Gravity is not an attractive force between masses, but is an external pressure force produced by the spacetime curvature. See Einstein's General Theory of Relativity.
well all of it is just a theory so you can just presume Einstein is correct.
Posted on 4/18/16 at 10:45 am to Placebeaux
Click here for this weird trick to keep from losing your pen.
Posted on 4/18/16 at 10:49 am to Placebeaux
C, the moon has enough gravity for the pen to fall toward it. All objects of its size/density do.
Posted on 4/18/16 at 11:22 am to CarRamrod
quote:
well all of it is just a theory so you can just presume Einstein is correct
It's a theory that is now backed up by the observing and measuring of gravitational waves emitted from a back hole.
A scientific breakthrough by LSU scientists
Posted on 4/18/16 at 11:49 am to Placebeaux
Back in the very early days of the American space program, NASA found that the normal ball point pens used on Earth did not write in space because the ink was gravity fed to the point. They spent thousands of dollars developing a pen that the astronauts could use that would write in zero gravity.
The Russians used pencils.
The Russians used pencils.
Posted on 4/18/16 at 12:12 pm to Bagger Joe
quote:
Back in the very early days of the American space program, NASA found that the normal ball point pens used on Earth did not write in space because the ink was gravity fed to the point. They spent thousands of dollars developing a pen that the astronauts could use that would write in zero gravity.
The Russians used pencils.
NASA did not use a pencil because they were concerned about the possibility of graphite particles from the pencil lead, which are electrically conductive, floating away in zero G and getting into the equipment.
Posted on 4/18/16 at 12:16 pm to Placebeaux
As long as we aren't changing the definitions of moon (lots of posters trying to do that in this thread) and pen, the answer will always be C.
Posted on 4/18/16 at 12:22 pm to junkfunky
Most Americans don't know the name of Earth's moon!
Much less physics related to it.
Much less physics related to it.
Posted on 4/18/16 at 12:23 pm to junkfunky
The question reads a moon, not the moon. So while the answer is still C, here's a little perspective. On Mars' moon Deimos (which is only 7 miles in diameter) the acceleration due to gravity is 0.003m/s^2 (compared to 1.662m/s^2 for our moon). If you dropped a pen from 3ft on the surface of Deimos it would take between 25 and 30 seconds to fall to the surface, which wouldn't appear like a conventional "fall".
Posted on 4/18/16 at 12:25 pm to OBReb6
quote:
If you dropped a pen from 3ft on the surface of Deimos it would take between 25 and 30 seconds to fall to the surface, which wouldn't appear like a conventional "fall".
are we talking like a regular Bic, or a fountain pen?
Posted on 4/18/16 at 12:26 pm to Pear
quote:
C. The Moon's gravity is 1/6th G
quote:
you sure?
very close to it, it is actually 16.6%, which times 6 is 99.6
Posted on 4/18/16 at 12:27 pm to 777Tiger
It wouldn't matter (no pun intended)
Posted on 4/18/16 at 12:29 pm to OBReb6
quote:
The question reads a moon, not the moon. So while the answer is still C, here's a little perspective. On Mars' moon Deimos (which is only 7 miles in diameter) the acceleration due to gravity is 0.003m/s^2 (compared to 1.662m/s^2 for our moon). If you dropped a pen from 3ft on the surface of Deimos it would take between 25 and 30 seconds to fall to the surface, which wouldn't appear like a conventional "fall".
Correct, A moon has to have enough mass to stay in orbit around a planet or other celestial body so it will have at least some gravity. Could take a century for the pen to travel the 3 feet to the surface of a given moon but it's going to get there eventually.
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