sodawater
Joined: May 14, 2012
• Posts: 3321
May 6th, 2014 at 8:03:24 PM permalink
There's an astronaut floating motionless in an empty part of outer space, nowhere near any major sources of gravity. Floating next to him is a steel pole that is 6 trillion miles (6x10^12) long, with a flag at the other end. The astronaut pushes the pole (he's really strong). How long does it take for the flag to move?
BleedingChipsSlowly
Joined: Jul 9, 2010
• Posts: 962
May 6th, 2014 at 8:11:28 PM permalink
Sometime next year, relatively speaking.
“You don’t bring a bone saw to a negotiation.” - Robert Jordan, former U.S. ambassador to Saudi Arabia
sodawater
Joined: May 14, 2012
• Posts: 3321
May 6th, 2014 at 8:14:36 PM permalink
Quote: BleedingChipsSlowly

Sometime next year, relatively speaking.

Nope.
BleedingChipsSlowly
Joined: Jul 9, 2010
• Posts: 962
May 6th, 2014 at 8:16:46 PM permalink
Quote: sodawater

Nope.

I'm calculating the time it would take for the reaction traveling at the speed of light, 186,000 miles a second. Not right?
“You don’t bring a bone saw to a negotiation.” - Robert Jordan, former U.S. ambassador to Saudi Arabia
sodawater
Joined: May 14, 2012
• Posts: 3321
May 6th, 2014 at 8:17:55 PM permalink
Yup, incorrect.
Ibeatyouraces
Joined: Jan 12, 2010
• Posts: 11933
May 6th, 2014 at 8:19:06 PM permalink
deleted
DUHHIIIIIIIII HEARD THAT!
sodawater
Joined: May 14, 2012
• Posts: 3321
May 6th, 2014 at 8:20:03 PM permalink
Quote: Ibeatyouraces

Never

Haha... why never?

I will specify that at some point after the astronaut pushes the pole, the flag at the other end does move.
Ibeatyouraces
Joined: Jan 12, 2010
• Posts: 11933
May 6th, 2014 at 8:23:05 PM permalink
deleted
DUHHIIIIIIIII HEARD THAT!
BleedingChipsSlowly
Joined: Jul 9, 2010
• Posts: 962
May 6th, 2014 at 8:27:31 PM permalink
How about the flag moves one year after the action, since it it is on a one light-year long pole, but it takes two years for the astronaut to see that movement.
“You don’t bring a bone saw to a negotiation.” - Robert Jordan, former U.S. ambassador to Saudi Arabia
sodawater
Joined: May 14, 2012
• Posts: 3321
May 6th, 2014 at 8:31:45 PM permalink
Quote: BleedingChipsSlowly

How about the flag moves one year after the action, since it it is on a one light-year long pole, but it takes two years for the astronaut to see that movement.

The astronaut can't see it at all... he is too far away.

Assume I want the answer from the flag's point of view. Assume that through some pre-arranged method (like observing an equidistant third party), a stopwatch at the flag is started the instant the astronaut pushes the pole.