1. What can happen when a star is moving near another star of the same mass? To
ID: 1515814 • Letter: 1
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1. What can happen when a star is moving near another star of the same mass? To begin with, we can assume that the center of mass is moving at constant speed. Why B: constant energy R: no net force on a star G: constant momentum Y: no torque 2. We can turn this into a problem in which the center of mass is not moving. How? B: Newton's second law not affected G: Total energy not affected Y: kinetic energy not affected R: No 3. The result is that the two stars have equal and opposite velocity vectors (not necessarily directed towards the other star). Why? B: Newton's second law G: Newton's third law Y: no angular momentum R: no momentum What 4. Is it possible that these stars will eventually collide? can we calculate that will answer this question? B: force G: momentum energy Y: momentum R: angular 5. Is it possible that after they pass each other they will move away from each other and never see each other again? What can we calculate that will answer this question? B: force G: energy momentum Y: momentum R: angularExplanation / Answer
1. Yes. we can say that the copm is moving with the constant speed ( because no net force on any star)
2. Yes. If we keep the com on the reference frame, we can get the frame where COM is not moving [newton's second law not effected]
3. We can derive this using newtons third law that the velocities are equal and opposite
4. These stars will collide only if the angular momentum of the sytem is depreciating or else, the net energy of the system is decreasing
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