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```				   The earth of mass m , radius r  is revolving around sun in an orbit of radius D with an angular velocity ω and rotating around itself with an angular velocity ω' . What is the total kinetic energy of the earth ?
```

7 years ago

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```										Hi,
It sometimes is convenient to split the total kinetic energy of a body into the sum of the body's center-of-mass translational kinetic energy and the energy of rotation around the center of mass (rotational energy):
$E_k = E_t + E_r \,$
where:
Ek is the total kinetic energyEt is the translational kinetic energyEr is the rotational energy or angular kinetic energy in the rest frame
=.5mω2D2  + .5I(ω')2
where, I = moment of inertia
```
7 years ago

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