Good question...made me look up geography concepts again.
It seems we take 24 hours to make one rotation...at the speed of 1000 miles per hour.
But it seems that the earth hardly moves at the poles because of the small surface area.
The shape of the Earth is not a perfect sphere, but an oblate spheroid. The reason for its oblate spheroid shape shall not be discussed here. For the purpose of studying the rotational speed, we the Earth’s shape can be approximated to a sphere.
Circumference of Earth at the Equator =40,000 km
The time taken for one rotation = 24 h
Speed of rotation at the Equator = (40,000 /24) km/h
=1666.67 km/h
Circumference of Earth at the latitude of 40⁰ N = 30, 600 km
Time taken for one rotation = 24 h
Speed of rotation at 40⁰ N = (30,600/24) km/h
= 1,275 km/h
At the poles, the latitude is 90⁰ and radius is zero
Circumference at the Poles = 0 km
Hence, Speed of Rotation at the poles is zero
Note: Clarification on using the term Speed instead of Velocity
There is no need for direction as we are only interested in the speed of rotation. So, the term speed is more appropriate than velocity.
Good question...made me look up geography concepts again.
It seems we take 24 hours to make one rotation...at the speed of 1000 miles per hour.
But it seems that the earth hardly moves at the poles because of the small surface area.
This link has more info
https://sciencing.com/earth-rotate-slower-faster-top-17525.html
The shape of the Earth is not a perfect sphere, but an oblate spheroid. The reason for its oblate spheroid shape shall not be discussed here. For the purpose of studying the rotational speed, we the Earth’s shape can be approximated to a sphere.
Circumference of Earth at the Equator =40,000 km
The time taken for one rotation = 24 h
Speed of rotation at the Equator = (40,000 /24) km/h
=1666.67 km/h
Circumference of Earth at the latitude of 40⁰ N = 30, 600 km
Time taken for one rotation = 24 h
Speed of rotation at 40⁰ N = (30,600/24) km/h
= 1,275 km/h
At the poles, the latitude is 90⁰ and radius is zero
Circumference at the Poles = 0 km
Hence, Speed of Rotation at the poles is zero
Note: Clarification on using the term Speed instead of Velocity
There is no need for direction as we are only interested in the speed of rotation. So, the term speed is more appropriate than velocity.