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Weight Changes! (Patreon)

Published:
2017-03-30 20:21:45
Imported:
2021-10

Content


Files

tungsten block in different cities

Help me make videos by donating here: https://www.patreon.com/CodysLab

Comments

Anonymous

I surprised you were able to stop your self from weighing it during the flight. I'm sure someone would've been afraid to be assimilated by that cube

Anonymous

what in sam-hell are you doing in Cville? [Civille resident]

Anonymous

That's odd. At first glance, I would have expected the cube to weigh less in Salt Lake since (assuming my math is right) gravity is about 0.14% less there due to the elevation/distance from the center of the earth. Is this a buoyancy effect from a lower air pressure at altitude?

Anonymous
>>4483063

As far as I understand it, gravity pull is not concentrated towards the center of the Earth, it is distributed throughout the entire volume according to the mass/density, so if the Earth crust is thicker and/or composed of more dense stuff around the area - the tungsten block would get slightly more heft to it. Don't quote me on that, I'm sure Cody will explain it soon.

Anonymous

It might be possible to get a better version of this gravity map elsewhere, but here is national geographic's version of it. <a href="http://news.nationalgeographic.com/news/2011/04/110406-new-map-earth-gravity-geoid-goce-esa-nasa-science/" rel="nofollow noopener" target="_blank">http://news.nationalgeographic.com/news/2011/04/110406-new-map-earth-gravity-geoid-goce-esa-nasa-science/</a>

Anonymous

Thinking more about this, buoyancy would make the weight lower at at lower elevation, since you have to subtract the mass of the volume of air displaced from the mass of the cube. Since air density is higher in Charlottesville (~600 ft, vs 4200ft in Salt Lake) the cubic inch of air would have more mass, thus a lower weight on the scale. I don't think the difference in the mass of that small volume of air though anywhere near the mass of the sugar packet though, so maybe something else is effecting the calibration of the scale.

Anonymous

When were these measurements taken? Where was the moon? I don't know if I've seen a tidal map of SLC airport before.

Anonymous

There was a BBC documentary on this just a few days ago.

Anonymous

ps <a href="http://www.bbc.co.uk/iplayer/episode/b08kgv7f/gravity-and-me-the-force-that-shapes-our-lives" rel="nofollow noopener" target="_blank">http://www.bbc.co.uk/iplayer/episode/b08kgv7f/gravity-and-me-the-force-that-shapes-our-lives</a>

Anonymous

Aarg - can't newline without entering. Documentary showed that latitude is as important as elevation due to the earth being non-spherical, and also local density of the surrounding crust. G is lowest in the UK on top of the tors in Dartmoor, nowhere near the highest point but a long way south, so furthest from the centre of the earth.

Anonymous

Are you doing a meet up in Manchester as I'm from Manchester and would be crazy cool to meet you

Anonymous

Winds and drafts can affect the weight as can grease from your fingers. The balance might also be sensitive to temperature. Check this out under controlled conditions at home - maybe with your analytical balance and a fan.