Posted by **Adam** on Friday, May 14, 2010 at 2:58pm.

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

- college physics -
**find any other answers let me know!!!**, Saturday, November 27, 2010 at 12:40am
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.

- college physics -
**jessica**, Sunday, November 28, 2010 at 12:02am
hey..i got 5.52940206x10^26

is that what you got? what are the units?

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