How to Calculate the Circumference of a Circle

How an Ancient Greek Calculated the Earth's Circumference - GreekReporter.com

Measure the Earth’s Circumference with a Shadow | STEM Activity

10 ways you can tell the Earth is round

Ask a NASA astronomer! Is there proof that the Earth is round?

How Do We Know the Earth is Round and Not Flat? | Earth Reminder

At the equator the radius of the earth is approximately 3960 mi... | Filo

The Earth'S Magnetic Field at the Equator is Approximately 0.4 G. Estimate the Earth'S Magnetic Dipole Moment. - Physics | Shaalaa.com

The earth has a radius of 6380 km and turns around once on its axis in 24 h . (a) What is the radial acceleration of an object at the earth's equator? Give your answer in m / s^2 and as a fraction of g . (b) If a rad at the equator is greater than g, objects will fly off the earth's surface and into space. (We will see the reason for this in Chapter 5.) What would the period of the earth's rotation have to be for this to occur? | Numerade