Can you run backwards fast enough to...
Discussion
Not quite the same thing, but a well travelled friend of mine told me he'd had a conversation with and 'older' woman on a transatlantic flight a few years ago.
Apparently when her Husband died, she decided to go travelling, which is nice! But it dawned on her that because she'd gone around the world in one direction, she'd lost a day so given that she reckoned she couldn't afford to lose a day at her time of life, she went the other way round to get it back!!
I know it doesn't work quite like that, I just though it was sweet.
Apparently when her Husband died, she decided to go travelling, which is nice! But it dawned on her that because she'd gone around the world in one direction, she'd lost a day so given that she reckoned she couldn't afford to lose a day at her time of life, she went the other way round to get it back!!
I know it doesn't work quite like that, I just though it was sweet.
If you take local time you have travelled in time. (of course you haven't really).You would not be affected time travel wise since you are only increasing your speed relative to the globe and to a stationary observer you would still be doing 5-10 mph.
Astronauts who spend weeks orbiting earth do technically return to earth slightly younger compared with people who have remained on earth however (I read this somwhere, might not be true).
The problem with achieing the speed of light is that if you throw 2 objects towards each other, each travelling at say 2/3 speed of light, you do not get 1.2 times the speed of light, you still only get 0.6
Astronauts who spend weeks orbiting earth do technically return to earth slightly younger compared with people who have remained on earth however (I read this somwhere, might not be true).
The problem with achieing the speed of light is that if you throw 2 objects towards each other, each travelling at say 2/3 speed of light, you do not get 1.2 times the speed of light, you still only get 0.6
If you had a plane that could lap the earth around the equator in 1 minute, and you started East at 12 noon on 1st January, you would reach the international date line at about 00:00:30 on 2nd Jan, then it will become 00:00:30.000000000001 on 1st Jan as soon as you cross. You wil end up back where you started at 12:01 on 1st Jan. I think!
If you ran at a speed at the equator which matched the Earths rotation, so that you were effectively stationary, you'd be very slightly heavier due to the lack of centrifugal force you'd normally feel due to the earth rotating. You'd get the same effect by going to the pole too.
Things on the equator also weigh less than at the pole due to the earth's shape being bulged around the equator - you're slightly further away from the earth's centre of gravity, so gravitational attraction is slightly reduced
Things on the equator also weigh less than at the pole due to the earth's shape being bulged around the equator - you're slightly further away from the earth's centre of gravity, so gravitational attraction is slightly reduced
isee said:
Astronauts who spend weeks orbiting earth do technically return to earth slightly younger compared with people who have remained on earth however (I read this somwhere, might not be true).
It is true - time slows down when you travel quickly so you don't age as much (it's been tested with atomic clocks on Concorde and satelites have to take this into account when buzzing round the Earth) - read up on general relativity if you have a spare year...FunkyNige said:
isee said:
Astronauts who spend weeks orbiting earth do technically return to earth slightly younger compared with people who have remained on earth however (I read this somwhere, might not be true).
It is true - time slows down when you travel quickly so you don't age as much (it's been tested with atomic clocks on Concorde and satelites have to take this into account when buzzing round the Earth) - read up on general relativity if you have a spare year...Dave_ST220 said:
FunkyNige said:
isee said:
Astronauts who spend weeks orbiting earth do technically return to earth slightly younger compared with people who have remained on earth however (I read this somwhere, might not be true).
It is true - time slows down when you travel quickly so you don't age as much (it's been tested with atomic clocks on Concorde and satelites have to take this into account when buzzing round the Earth) - read up on general relativity if you have a spare year...
marshalla said:
Dave_ST220 said:
FunkyNige said:
isee said:
Astronauts who spend weeks orbiting earth do technically return to earth slightly younger compared with people who have remained on earth however (I read this somwhere, might not be true).
It is true - time slows down when you travel quickly so you don't age as much (it's been tested with atomic clocks on Concorde and satelites have to take this into account when buzzing round the Earth) - read up on general relativity if you have a spare year...MartG said:
If you ran at a speed at the equator which matched the Earths rotation, so that you were effectively stationary, you'd be very slightly heavier due to the lack of centrifugal force you'd normally feel due to the earth rotating. You'd get the same effect by going to the pole too.
Things on the equator also weigh less than at the pole due to the earth's shape being bulged around the equator - you're slightly further away from the earth's centre of gravity, so gravitational attraction is slightly reduced
Things on the equator also weigh less than at the pole due to the earth's shape being bulged around the equator - you're slightly further away from the earth's centre of gravity, so gravitational attraction is slightly reduced
Centrifugal force is fictitious! Triumph Coupe said:
MartG said:
If you ran at a speed at the equator which matched the Earths rotation, so that you were effectively stationary, you'd be very slightly heavier due to the lack of centrifugal force you'd normally feel due to the earth rotating. You'd get the same effect by going to the pole too.
Things on the equator also weigh less than at the pole due to the earth's shape being bulged around the equator - you're slightly further away from the earth's centre of gravity, so gravitational attraction is slightly reduced
Things on the equator also weigh less than at the pole due to the earth's shape being bulged around the equator - you're slightly further away from the earth's centre of gravity, so gravitational attraction is slightly reduced
Centrifugal force is fictitious! 
Nic Jones said:
Triumph Coupe said:
MartG said:
If you ran at a speed at the equator which matched the Earths rotation, so that you were effectively stationary, you'd be very slightly heavier due to the lack of centrifugal force you'd normally feel due to the earth rotating. You'd get the same effect by going to the pole too.
Things on the equator also weigh less than at the pole due to the earth's shape being bulged around the equator - you're slightly further away from the earth's centre of gravity, so gravitational attraction is slightly reduced
Things on the equator also weigh less than at the pole due to the earth's shape being bulged around the equator - you're slightly further away from the earth's centre of gravity, so gravitational attraction is slightly reduced
Centrifugal force is fictitious! Gassing Station | The Pie & Piston Archive | Top of Page | What's New | My Stuff