Question

What is the period of a pendulum whose length is equal to the radius of the earth?

Answer 1

Well the period of a pendulum of length \( \ell \) at the surface of the earth is
\[ T = 2\pi \sqrt{\ell/g} \]
So make the appropriate substitutions.

Answer 2

Yes just want to verify my answers

Answer 3

Slightly odd question.

Answer 4

yes

Answer 5

based on that will have to derive Kepler I m looking at the video lectures on your link if ypou have hints will be helpful