University Physics 1 - Momentum, Impulse, Collisions, Rotation of Rigid bodies, Dyanimcs of Rotational motion, Equilibrium, and Elasticity.   I need help with this problem and an explanation of the solutions described below:     The professor hands you two spheres. They have the same mass, the same radius, and the same exterior surface. The professor claims that one is a solid sphere and the other is hollow. Can you determine which is which without cutting them open? If so, how? If not, why not?

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