Estimate the rotational kinetic energy of Earth, assuming it to be a solid sphere of uniform density.

Answer 1

the equation used here i believe is

K=1/2lw^2

k=KE due to rotation
l=moment of inertia about rotation axis
w=angular velocity

l=2/5mr^2

m=mass of sphere
r=radius of earth

you have to look up all these numbers i believe
i found the mass of the earth to be:
5.97*10^24kg
and the radius to be:
6.37*10^6m or 6371 km
and the angular velocity to be:
7.27*10^-5 rad/s

plugging that all in i believe is how you estimate the rotational KE. let me know what you get and we'll compare.

Answer 2

hey..i got 5.52940206x10^26

is that what you got? what are the units?