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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 distintegrates into two smaller nuclei the products must be emitted 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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An object may be regarded to be rest or in motion depending on the frame of reference chosen to view the object. Because of length contraction it would mean that the same rod may have two dfferent lenghts depending on the state of the observe. Is this true ?

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(Bi)_212^83 can disintegrate either by emitting an alpha -particle or by emitting a beta -particle. (a) write the two equations showing the products of the decays. (b) The probabilities of disintergration by alpha and beta -decays are in the ratio 7/13. The overall half-life of Bi^212 is one hour. If 1 g pure Bi^212 is taken at 12.00 noon,what will be the composition of this sample at 1 p.m the same day?

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At which stage of mitosis, the two daughter chromatids separate from each other, migrate towards the opposite poles and are now referred to as chromosomes of the future daughter nuclei?

Figure shows two parallel wires separated by a distance of 4.0 cm and carrying equal currents of 10A along opposite directions. Find the magnitude of the magnetic field B at the points A_1, A_2, A_3 and A_4.

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NCERT TAMIL-LAW OF MOTION-EXERCISE
  1. One end of a string of length 'l' is connected to a particle of m...

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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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  3. A constant force acting on a body of mass 3 kg changes its speed from ...

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  4. A body of mass 5 kg is acted upon by two perpendicular forces 8 N and ...

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

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  6. A rocket with a lift off mass 20000 kg is blasted upwards with a net i...

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  7. A body of mass 0 .40 kg moving initially with a constant speed of 10 ...

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  8. A truck starts from rest and accelerate uniformly with 2 ms^(-2) . At ...

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

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

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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 hor...

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  13. Two masses 7 kg and 12 kg are connected at the two ends of a light ine...

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

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  15. Two billiard balls each of mass 0 .05 kg moving in opposite directions...

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  16. A bullet of mass 50 g is fired by a gun of mass 5 kg .If the muzzle s...

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

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  18. A stone of of mass 0 .25 kg tied to the end of a string is whirled rou...

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  19. If in Q . 21 the speed of the stone is increased beyond the maximum pe...

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

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