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In an elastic collision of two billiard ...

In an elastic collision of two billiard balls, is the total kinetic energy conserved during the short time of collision of the ball (i.e when they are in contact)?

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In the following question, a statement of Assertion is followed by a statement of Reason. Mark the correct choice. Assertion: In an elastic collision of two billiard balls are in contact with each other. During the short time of collision, kinetic energy is conserved. Reason: Energy, spent against friction does not follow the law of conservation of energy

Which is conserved in inelastic collision ? Total energy (or) Kinetic energy ?

Which physical quantities is / are conserved during elastic and inelastic collision?

A particle of mass 100 g moving at an initial speed u collides with another particle of same mass kept initially at rest. If the total kinetic energy becomes 0.2 J after the collision what could be minimum and the maximum value of u.

Separation of Motion of a system of particles into motion of the centre of mass and motion about the centre of mass : (a) Show p=p_(i)'+m_(i)V where pi is the momentum of the ith particle (of mass m_(i) ) and p'_(i)=m_(i)v'_(i) . Note v'_(i) is the velocity of the ith particle relative to the centre of mass. Also, prove using the definition of the centre of mass sump'_(i)=O (b) Show K=K'+1//2MV^(2) where K is the total kinetic energy of the system of particles, K′ is the total kinetic energy of the system when the particle velocities are taken with respect to the centre of mass and MV^(2)//2 is the kinetic energy of the translation of the system as a whole (i.e. of the centre of mass motion of the system). The result has been used in Sec. 7.14. (c ) Show L=L'+RxxMV where L'=sumr'_(i)xxp'_(i) is the angular momentum of the system about the centre of mass with velocities taken relative to the centre of mass. Remember – r'_(i)=r_(i)-R , rest of the notation is the standard notation used in the chapter. Note ′ L and MR × V can be said to be angular momenta, respectively, about and of the centre of mass of the system of particles. (d) Show (dL')/(dt)=sumr'_(i)xx(dp')/(dt) Further, show that (dL')/(dt)=tau'_(ext) where tau'_(ext) is the sum of all external torques acting on the system about the centre of mass.

When is the exchange of energy maximum during an elastic collision.

NCERT TAMIL-WORK, ENERGY AND POWER-EXERCISES
  1. State if each of the following statements is true or false. Give reaso...

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  2. State if each of the following statements is true or false. Give reaso...

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  3. In an elastic collision of two billiard balls, is the total kinetic en...

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  4. Anwer carefully, with reasons: a) In an elastic collision of two bil...

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  5. Anwer carefully, with reasons: a) In an elastic collision of two bil...

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  6. Anwer carefully, with reasons: a) In an elastic collision of two bil...

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  7. A body is initially at rest. It undergoes one-dimensional motion with ...

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  8. A body is moving undirectionally under the influence of a source of co...

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  9. A body constrained to move along the Z-axis of a co-ordinate system is...

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  10. An electron and a proton are detected in a cosmic ray experiment, the ...

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  11. A rain drop of radius 2mm, falls from a height of 500 m above the grou...

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  12. A molecule in a gas container hits a horizontal wall with a speed of 2...

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  13. A pump on the ground floor of a building can pump of water to fill a ...

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  14. Two identical ball bearings in contact with each other and resting on ...

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  15. The bob A of a simple pendulum released from 30^(@) to the vertical hi...

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  16. The bob A of a simple pendulum is released from a horizontal position ...

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  17. A trolley of mass 300 ks carrying a sand bag of 25 kg is moving unifor...

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  18. A particle of mass 0.5kg travels in a straight line with velocity v=ax...

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  19. The blades of a windmill sweep out a circle of area A. (a) If the wind...

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  20. The blades of a windmill sweep out a circle of area A. What is the k...

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