- #1

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does that affect the equivalence principle?

- B
- Thread starter alba
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- #1

- 140

- 4

does that affect the equivalence principle?

- #2

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Yes you can .does that affect the equivalence principle?

You feet will feel 9.80627m/Thank you very much

Okay...

The earth radius from equator is 6378.1 km, let's call itr

https://en.wikipedia.org/wiki/Earth

or 6378.100m

This is what makes me irritated. I'm calculating 1.7 m against a 0.1 km rounding. But, I'll do it anyway...

##F = G \frac{M * \text{my weight} * kg }{r^2}##

...

##F = 9.80627 * N * \text{my weight}##

...

##a_{head} = 9.806264773##

##a_{feet} = 9.80627##

I don't know if my calculation is correct.

Thanks for the attentions.

Because your head is farther from the centre of the gravity. But there's no such thing on elevator.

Okay, seriously. No!

That's the concept of Einstein Elevator. Light, everything works the same as on earth.

But not everything!

In Einstein Elevator the acceleration from your head and your feet is the same!

On earth there's a very-very little different.

And I might add, your head is older than your feet, because your feet ages more slowly than your head.

But just ignore my number. See the answer of the staffs in my post.

Sincerely.

- #3

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The whole post is based on the assumption that your feet-head axis is parallel to the radius of the source, which must no necessarily be the case.Hello, Alba.

Yes you can ..

But the point is not the a on your head or feet, the issue is that, whatever the difference, you can always tell when the F (or a) is coming from a push/pull i.e. on the inertial mass and not on the gravitational mass.

If Einstein knew that, what is the purpose of the example? More in general, how can our subjective perception or objective measurement of a phenomenon influes the actual state of the world?

- #4

Ibix

Science Advisor

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In a small enough region you cannot tell why you are in an accelerating frame. If the region is large enough that the non-uniform nature of the gravitational field is measurable that will give the game away, but the equivalence principle does not apply to such a large region.does that affect the equivalence principle?

- #5

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The same is true for gravity and the elevator. As you make the elevator smaller and smaller, the differences become harder and harder to measure and they tend to converge. On a fundamental level, they are equivalent.