Or in a other examples if we observe the earth from a height i.e from a helicopter them why does earth not seems us rotating, these both examples are based on the same concept,and today this concept is going to revealed,this type of questions is very popular in students and it is a very interesting phenomenon.
And I am feeling very happy to writing about this, so let’s starts-
We are going to explain this phenomenon
Explaination is as follows:
First of all do you see any sign that you can ensure that earth is rotating excluding day and night… here a experiment is given to check the rotation of the earth.
Take four balloons and tie it to the surface of the earth by a thread,and fill the normal atmospheric gases in three balloons and in one balloon fill a special gas which is lighter than atmospheric gases, then you will notice that all three balloons are stand straight but a balloon with lighter gas tilted by some angles in the opposite direction of rotation of the earth, why this happened?
this happened because lighter air has lower density as compared to the atmospheric gases, and we know that lower density means lower mass,, so lighter gases is always ready to escape from denser air to rarer air, this give a very weak gravitational interaction with the earth, due to this,earth goes forward and lighter gases remains behind, to becoming it’s relative velocity zero with the earth,
it takes a short period of time, and this time period is sufficient for object to get tilted with the earth surface, but all the atmospheric gases has relative velocity zero, because all atmospheric gases are fully caught by the earth gravitational force,and all atmospheric gases are also rotating with the same velocity as the earth rotates. So it doesn’t tilted. But lighter air get tilted.
then anyone can asked that why the thread not broke,answer of this question are in the second case,
Take a wooden block and tie the lighter balloon to it and then move the block suddenly with large speed , what did you see,you see that balloon is also moved with the block without any thread break.
As it is happening to the real world, every object which are at some height within the range of 36000KM, is tied with the virtual thread to the earth surface,this virtual thread is what? This virtual thread is nothing but simply the gravitational force,and when the earth rotates, these objects are also rotates with the earth by tilting at some angles and this angles is between the earth’s surface and gravitational force (virtual thread) between the object and earth.
That’s is the reason behind this phenomenon that why anyone can’t see the rotation of the earth, from the height. Note that:
this height is very very very small from the 36000KM.