Evidence that the Earth rotates in Space

  • Thread starter Thread starter IvanDkiwi
  • Start date Start date
  • Tags Tags
    Evidence Rotation
Click For Summary
The Foucault pendulum serves as strong evidence for Earth's rotation, as its plane of oscillation shifts due to the rotation of the Earth beneath it. Observations of the apparent motion of stars and parallax further support the concept of Earth's rotation around the sun. Calculating the pendulum's revolution time based on latitude can provide additional insights, especially when comparing results from different locations like the North Pole and the equator. Time-lapse images of stars from various poles illustrate the differing rotational directions, reinforcing the idea that the Earth rotates rather than the stars. Overall, these observations collectively affirm the Earth's rotation in space.
IvanDkiwi
Messages
1
Reaction score
0
Homework Statement
Hello,
I have a school project where i must explain and proove the rotation of the earth and i was wondering if the Foucault pendulum experience was an evidence that earth does rotate on itself.
Relevant Equations
Foucault pendulum
I was wondering if the Foucault pendulum experience was an evidence that earth does rotate on itself.
 
Physics news on Phys.org
Of course. The pendulum's plane of oscillation wouldn't rotate if it wasn't on a rotating object. It is strong evidence that the Earth is rotating.
 
Apparent motion of certain stars, parallax - motion around the sun
 
IvanDkiwi said:
Homework Statement: Hello,
I have a school project where i must explain and proove the rotation of the earth and i was wondering if the Foucault pendulum experience was an evidence that earth does rotate on itself.
Relevant Equations: Foucault pendulum

I was wondering if the Foucault pendulum experience was an evidence that earth does rotate on itself.

Foucault pendulum is good evidence. It might be interesting to try to do the calculation of how long a pendulum will take to do one revolution as a function of latitude. For example, if you had one at the north pole, at 30 degrees north, or at the equator, what would you see? Then find nearby museum with a big one and see if your calculation matches.
 
  • Like
Likes IvanDkiwi and gmax137
malawi_glenn said:
Apparent motion of certain stars, parallax - motion around the sun
Welcome to PF, @IvanDkiwi :smile:

Just to add to Malawi's idea above, you could find time-lapse images of the stars when looking vertically from the North and South Poles. With such sequential images, you could see that the star fields rotate in different directions at the two poles.

And what other observation(s) would you need to make to prove that it's the Earth that rotates against a mostly-stationary star field, instead of the giant field of stars rotating around Earth? :wink:

1685460638667.png

https://www.noctilucents.com/blog/the-circling-stars
 
Last edited:
  • Like
Likes SammyS and malawi_glenn
Another piece of evidence, why did usa launch space shuttles in florida, and russia in kazakstan? (Closer to equator, more tangential speed)
 
Thread 'Chain falling out of a horizontal tube onto a table'
My attempt: Initial total M.E = PE of hanging part + PE of part of chain in the tube. I've considered the table as to be at zero of PE. PE of hanging part = ##\frac{1}{2} \frac{m}{l}gh^{2}##. PE of part in the tube = ##\frac{m}{l}(l - h)gh##. Final ME = ##\frac{1}{2}\frac{m}{l}gh^{2}## + ##\frac{1}{2}\frac{m}{l}hv^{2}##. Since Initial ME = Final ME. Therefore, ##\frac{1}{2}\frac{m}{l}hv^{2}## = ##\frac{m}{l}(l-h)gh##. Solving this gives: ## v = \sqrt{2g(l-h)}##. But the answer in the book...

Similar threads

Replies
6
Views
910
  • · Replies 9 ·
Replies
9
Views
2K
  • · Replies 2 ·
Replies
2
Views
1K
Replies
17
Views
1K
Replies
4
Views
247
Replies
10
Views
2K
  • · Replies 1 ·
Replies
1
Views
2K
Replies
18
Views
2K
  • · Replies 9 ·
Replies
9
Views
2K
  • · Replies 32 ·
2
Replies
32
Views
6K