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What are binary stars? Describe their mo...

What are binary stars? Describe their motion in terms of centre of mass.

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A double star is a system of two stars of masses m and 2m , rotating about their centre of mass only under their mutual gravitational attraction. If r is the separation between these two stars then their time period of rotation about their centre of mass will be proportional to

MODERN PUBLICATION-SYSTEMS OF PARTICLES AND ROTATIONAL MOTION-REVISION EXERCISES (Short Answer Questions Carrying 2 or 3 marks)
  1. What do you mean by centre of mass of a system? How it differs from th...

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  2. Show that centre of mass of an isolated system moves with a uniform ve...

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  3. What are binary stars? Describe their motion in terms of centre of mas...

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  4. A fire cracker following a parabolic path explodes in mid air. The cen...

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  5. What are the factors on which centre of mass of a system depends?

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  6. Show that the angular momentum of a particle is equal to twice the pro...

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  7. Prove that the rate of change of angular momentum is equal to torque a...

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  8. Why are doors provided with handles near the outer edges, far away fro...

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  9. We cannot open or close the door by applying force at the hinges. Why?

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  10. Why it is more difficult to revolve a stone by tying it to a longer st...

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  11. Distinguish between stable, unstable and neutral equilibrium of a body

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  12. What are the factors on which moment of inertia of a body depend ?

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  13. What is radius of gyration? Derive an expression for the radius of gyr...

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  14. Establish a relation between angular momentum and moment of inertia of...

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  15. Establish a relation between angular momentum and moment of inertia of...

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  16. State and explain parallel axis theorem and perpendicular axis theorem...

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  17. Derive the relation between kinetic energy and moment of inertia of a ...

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  18. What will happen to the duration of the day if the ice on polar caps o...

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  19. How will you distinguish between a hard boiled egg and a raw egg by s...

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  20. If earth were to shrink suddenly, what would happen to the length of t...

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