Saturday

August 23, 2014

August 23, 2014

Posted by **Jim** on Wednesday, March 28, 2007 at 12:40pm.

Calculate the kinetic energy that the earth has because of its motion around the sun.

In either case, the trick is to calculate the moment of inertial.

In the first case, the moment of inertia of a solid sphere rotating about its axis.

In the second case, MassEarth*distancefromSun^2.

Then, KE= 1/2 I* radiusofrotation^2

Please check. The answer i came up with is wrong.

a.

rotational KE = 1/2(Iw^2)

=1/2(2/5mr^2)w^2

=1/2((2/5(5.98x10^24kg)(6.38x10^6m))(2PI rad/ s)^2

=(7.63048x10^30kg*m)(39.4384/2.49x10^-13)

= 1.210 x 10^18

**Related Questions**

physics - please help - Assume the earth is a uniform sphere and that its path ...

Physics - Assume that the earth is a uniform sphere and that its path around the...

physics - Assume that the earth is a uniform sphere and that its path around the...

Physics - Calculate the kinetic energy that the earth has because of (a) its ...

Physics - Calculate the kinetic energy that the earth has because of (a) its ...

Physics - Calculate the kinetic energy that the earth has because of (a) its ...

Physics - (a) Calculate the kinetic energy that the earth has because of its ...

Physics- drwls please help - (a) Calculate the kinetic energy that the earth has...

physics - Calculate the kinetic energy that the earth has because of its ...

physics - Assume the Earth is a sphere with its mass evenly distributed ...