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## Homework Statement

The Earth has a radius of approximately 6400 km. If an object could orbit the Earth just at its surface, how fast would it have to travel?

## Homework Equations

C = 2πr; a

_{c}=v

^{2}/r; F

_{c}=mv

^{2}/r

## The Attempt at a Solution

Circumference = 12800π. I tried to solve for the rate by d = r x t (86400s = 24 hours) but my answer is very small.