48. Calculate the kinetic energy that the planet has because of (a) its rotation about its very own axis and (b) the motion approximately the sun. Assume the the earth is a uniform sphere and also that its path approximately the sun is circular. Because that comparison, the complete energy provided in the United states in one year is about 1.1 x 1020 J. 

About our very own axis 
Moment that inertia would certainly be the moment of a solid sphere around an axis running v the center of the sphere 
Angular rate is 

Combining these 







About ours Sun 
Moment of inertia would be the moment of an object in orbit 

Angular speed is 

Combining these 





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