Posted by anonymous on Saturday, July 10, 2010 at 3:24pm.
Same answer to all three questions. It is the center of mass that newton's First and Second laws apply to.
In question One there is no external force or moment, so the linear and angular momentums remain constant. In question 2 the center of mass of the projectile continues along the same parabolic path that it did when it was all one body. The same applies to the star in question 3. The center of mass does not wobble, therefore the star is not alone but there must be at least one other body like a planet other other star that is interacting with the star and the center of mass of the star-planet system does not change its momentum.
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