Okay, time to stop everything
and nut out a brain teaser: if Earth is spinning to the east at 1,180 km/h (733
mph), and we're in a plane flying west, shouldn't we get to our destination
quicker, seeing as it's literally spinning towards us? Question does make some
sense so why doesn’t it work like that?
The short answer is no,
because our plane is also affected by Earth's spin, which means we're spinning
away from our destination while our destination is spinning towards us.
Confused yet? Don't worry,
MinutePhysics has the slightly-less-short answer (it's still MinutePhysics,
after all) to this dizzying conundrum. While Earth itself is spinning about
1,180 km/h to the east, the ground and everything on it are travelling even
faster - at about 1,670 km/h (1,037 mph).
Even the air above the
ground is travelling at around this speed in an easterly direction. So for an
aeroplane to get anywhere at all, it has to be moving relative to the ground. Say
it's travelling at 160 km/h (100 mph) - because it's already moving at 1,670
km/h with the planet, plus that little bit extra, it's able to keep itself
ahead and actually get somewhere.
On the other hand, if it's
travelling towards the west, it's actually moving 1,670 km/h MINUS 160 km/h.
"Yes, to go west, you
go east - just slower than Earth is going east," says Henry Reich in the
video above. "Unless you're within 10 or so miles of the poles, in which
case a brisk westerward walk will take you legitimately west."
But it's not so simple
(we're kidding - it was never simple), because winds in the upper atmosphere
mess everything up. I'll let MinutePhysics explain in the video above, but
let's just say it's to do with different parts of Earth rotating at different
speeds, because it's a big, blue marble, and that's what big blue marbles do
when you spin them. We hope that makes
sense to everyone.
And if your brain seriously
hasn't had enough already, how about trying this one on for size: what would
happen if everyone on Earth jumped at the same time?
Source
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