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A nucleus is at rest in the laboratory f...

A nucleus is at rest in the laboratory frame of reference. Show that if it disintegrates into two smaller nuclei the products must move in opposite directions.

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By momentum conservation principle, total final momentum is zero. Two momentum vectors cannot sum to a null momentum unless they are equal and opposite.
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NCERT BANGLISH-LAW OF MOTION-EXERCISE
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  2. A constant retarding force of 50 N is applied to a body of mass 20 kg ...

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  5. The driver of a three-wheeler moving with a speed of 36 km/h sees a ch...

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  7. A body of mass 0.40 kg moving initially with a constant speed of 10 m ...

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  8. A truck starts from rest and accelerates uniformly at 2.0 m s^(-2). A...

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  9. A bob of mass 0.1 kg hung from the ceiling of a room by a string 2 m l...

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  10. A man of mass 70 kg stands on a weighing scale in a lift which is mov...

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  11. Figure shows the position-time graph of a particle of mass 4 kg. Wha...

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  12. Two bodies of masses 10 kg and 20 kg respectively kept on a smooth, ho...

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  13. Two masses 8 kg and 12 kg are connected at the two ends of a light in...

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  14. A nucleus is at rest in the laboratory frame of reference. Show that ...

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  15. Two billiard balls each of mass 0.05 kg moving in opposite directions ...

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  16. A shell of mass 0.020 kg is fired by a gun of mass 100 kg. If the muz...

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  17. A batsman deflects a ball by an angle of 45^@ without changing its in...

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  18. A stone of mass 0.25 kg tied to the end of a string is whirled round i...

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  19. If, the speed of the stone is increased beyond the maximum permissible...

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  20. Explain why (a) a horse cannot pull a cart and run in empty space, (b)...

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