| 11. | They orbit each other about a common centre of mass, a two body problem.
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| 12. | :Balanced external forces means that the object's centre of mass is not accelerating.
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| 13. | The two stars take approximately 40 days to complete an orbit around their common centre of mass.
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| 14. | If the centre of mass is placed forward of the fins, the rocket will nose dive.
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| 15. | Thus the'geometric'and'centre of mass'is not necessarily going to coincide.
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| 16. | Several systems are known to orbit a common centre of mass and are known as binary companions.
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| 17. | This is true in general : nonlinear Hartree equations never have an influence on the centre of mass.
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| 18. | As there are no horizontal forces on the stick, its centre of mass must fall vertically downwards.
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| 19. | This is reversed in running where the centre of mass is at its lowest as the leg is vertical.
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| 20. | The axis passes through the reflector's centre of mass, allowing the reflector to be turned easily.
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