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A rocket moves forward by pushing the su...

A rocket moves forward by pushing the surrounding air backwards.

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TRUE/FALSE TYPE QUESTIONS: A rocket moves forward by pushing the surrounding air backward.

Does doubling the thrust of a rocket by doubling the rate of which mass is thrown backward double the final speed of the rocket? Why or why not.?

Assertion: A spinning cricket ball deviates from is trajectory as it moves through air. Reason: The ball is moving forward and relative to it the air is moving backward.

In the given circuit, the diode has a forward resistance of 8 Ω and infinite backward resistance. The value of R is :-

Statement-1: In a reversible endothemic reactiuon, E_(act) of forward reaction is higher than that of backward reaction. Statement-2: The threshold energy of forward reaction is more than that of backward reaction.

Assertion (A) : In a reversible endothermic reaction, E_("act") of the forward reaction is higher than that of the backward reaction Reason (R) : The threshold energy of the forward reaction is more than that of the backward reaction.

SL ARORA-Laws of Motion-Exercise
  1. Block a of mass 4 kg is to be kept at rest against a smooth vertical w...

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  2. Consider three cases, same spring is attached with 2kg , 3kg and 1kg b...

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  3. A rocket moves forward by pushing the surrounding air backwards.

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  4. Assertion: Frictional forces are conservative forces. Reason: Potent...

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  5. Assertion: The driver in a vechicle moving with a constant speed on a ...

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  6. Assertion: A man in a dosed cabin falling freely does not experience g...

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  7. Assertion : It is difficult to move a cylce along the roda with its...

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  8. Assertion: On a rainy day, it is difficult to drive a car or bus at h...

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  9. Assertion : Use of ball beaings between two moving parts of a machine ...

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  10. Assertion: Centripetal acceleration is always direction towards the ce...

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  11. Assertion : The apparent weight of a body in an elevator moving with...

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  12. Assertion : Impulsive force is large are acts for a short time. Rea...

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  13. Assertion : A horse has to pull a cart harder during the first few ste...

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  14. Assertion:A table cloth can be pulled from a table without dislodging ...

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  15. Assertion : A body can be at rest even when it is under the action of ...

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  16. Assertion: The centripetal forces and centrifugal forces never cancel ...

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  17. Assertion: A quick collision between two bodies is more violent that s...

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  18. Assertion : Thrust on a rocket depends only on velocity of exhaust gas...

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  19. Statement I : On banked curved road, vertical component of normal reac...

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  20. Assertion: Pseudo force is an imaginary force which is recongnised on...

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