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Answer the following : The casing of a...

Answer the following :
The casing of a rocket in flight burns up due to friction. At whose expense is the heat energy required for burning obtained ? The rocket or the atmosphere?

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The spring of a rocket in flight burns up due to friction .At whose expense is the heat energy required for burning obtained ? The rocket or the atmosphere ?

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The XI^(th) class students of ALLEN designed a rocket. The rocket was launched from cycle stand of ALLEN straight up into the air. At t = 0 , the rocket is at y = 0 with V_(y) (t = 0) = 0 . The velocity of the rocket is given by: V_(y) = (24t - 3t^(2))m//s for 0 le t le t_(b) where t_(b) is the time at which fuel burns out. vertically upward direction is taken as positive. (g = 10m//s^(2)) The time taken for rocket to reach its maximum height is

The XI^(th) class students of ALLEN designed a rocket. The rocket was launched from cycle stand of ALLEN straight up into the air. At t = 0 , the rocket is at y = 0 with V_(y) (t = 0) = 0 . The velocity of the rocket is given by: V_(y) = (24t - 3t^(2))m//s for 0 le t le t_(b) where t_(b) is the time at which fuel burns out. vertically upward direction is taken as positive. (g = 10m//s^(2)) The displacement of the rocket till the fuel burns out (t = t_(b)) is

The XI^(th) class students of ALLEN designed a rocket. The rocket was launched from cycle stand of ALLEN straight up into the air. At t = 0 , the rocket is at y = 0 with V_(y) (t = 0) = 0 . The velocity of the rocket is given by: V_(y) = (24t - 3t^(2))m//s for 0 le t le t_(b) where t_(b) is the time at which fuel burns out. vertically upward direction is taken as positive. (g = 10m//s^(2)) The expression for the acceleration a_(y)(t) valid at all times in the interval 0 lt t lt t_(b) is

Statement - 1 : The steam at 100^(@)C causes more severe burn to human body than the water at 100^(@)C . Statement- 2 : The steam has greater internal energy due to latent heat of vaporization.

NCERT GUJARATI-WORK, ENERGY AND POWER-EXERCISES
  1. A body of mass 2 kg initially at rest moves under the action of an app...

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  2. Given in Fig. 6.11 are examples of some potential energy functions in ...

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  3. Answer the following : The casing of a rocket in flight burns up due...

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  4. Comets move around the sun in highly elliptical orbits . The gravita...

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  5. An artificial satellite orbiting the earth in very thin atmosphere lo...

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  6. Answer the following : In Fig.6.13. (i) the man walks 2m carrying a ...

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  7. When a conservative force does positive work on a body , the potential...

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  8. Work done by a body against friction always results in a loss of its k...

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  9. The rate of change of total momentum of a many -particle system is pro...

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  10. In an inelastic collision of two bodies, the quantities which do not c...

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

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

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

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

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  15. Answer carefully, with reasons : In an elastic collision of two bill...

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  16. Answer carefully, with reasons : Is the total linear momentum conser...

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  17. Answer carefully, with reasons : What are the answers to (a) and (b)...

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  18. Answer carefully, with reasons : If the potential energy of two bill...

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

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  20. A body is moving unidirectionally under the influence of a source of c...

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