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?

## Answer this Question

## Related Questions

- physics - estimate the rotational kinetic energy of earth, assuming it to be a ...
- Physics - A solid sphere of uniform density starts from rest and rolls without ...
- Physics 121 - A solid sphere of uniform density starts from rest and rolls ...
- Physics (Rotational Kinetic Energy) - Hello, The question is: A solid ball rolls...
- Physics - Calculate the kinetic energy that the earth has because of its ...
- PHYSICS 1 - When a pitcher throws a curve ball, the ball is given a fairly rapid...
- Physics - A solid sphere of uniform density starts from rest and rolls without ...
- Physics- drwls please help - (a) Calculate the kinetic energy that the earth has...
- Physics - A uniform solid sphere of mass 4kg and diameter 20cm initally at rest...
- physics - What is the rotational kinetic energy of a planet about its spin axis...

More Related Questions