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Seriously: If you value it, take/fetch it yourself
Or you could just go to the seaside and watch the tide for a day.
That the GPS on your phone works proves quite a lot of astronomy and quantum mechanics too.
Relativity - corrections to the clocks required to account for time differences due to general relativity.
Orbit, equations of motion, Earth's rotation. That the satellites are up there at all confirms basic Newtonian mechanics and gravity operate (if GR wasn't enough for the second one), the rotation of the Earth makes a difference when launching them in the first place (though this is more relevant for equatorial and geostationary satellites, if you are watching the clip on Sky TV then the Earth is rotating), and of course you need to know it for actually translating to position on the ground.
Quantum mechanics, the operation of the various chips in the phone itself relies on quantum effects, mostly things like discrete energy levels in semiconductors.
Remember, it's easier to criticise than create!
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
One alternative of course is what you see over here when a politician is asked to multiply 11 by 12. I suppose at least he's trying.
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein