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**[SOLVED] Forece Between Two Hemispheres**

I am trying to study for my classical mechanics final, and the prof hinted that this problem would be on the final.

**Two uniform rigid hemispheres eachof mass**

*M*and radius*a*are placed in contact with each other so as to form a complete sphere. Find the forces necessary to pull the hemishperes apartI've been mulling over it for three days now trying to figure out how to solve it.

I tried used spherical cooridnated to solve it but I am not sure where to begin.

I possibly could find the force due to a sphere of Mass

*2M*, but that does not help me in finding the force required to separate the hemispheres.

The back of the book gives the soloution, but thats useless to me if I can't get to it.

How would I go about to begin solving the problem?