Tag: satellite launch vehicles
Questions Related to satellite launch vehicles
The formula for critical velocity is :
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$\sqrt {2R g}$
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$\dfrac{R}{g}$
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$\dfrac{3R}{2g}$
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$\sqrt {R g}$
The velocity required to put a satellite in its orbit around a planet is called critical velocity .The critical velocity or orbital velocity of a satellite of planet of radius $R$ is given by $v _{o}=\sqrt{gR}$
The escape velocity for any satellite to be placed in a orbit is :
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$11.2 \ kms^{-1}$
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$11 \ kms^{-1}$
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$22 \ kms^{-1}$
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$22.2 \ kms^{-1}$
The escape velocity on a planet of radius $R$ is given by ,
The correct relation between escape velocity $v _e$ and critical velocity $v _0$ is :
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$ v _e=\sqrt{\dfrac{3}{2}} v _0$
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$ v _e=\sqrt{2} v _0$
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$ v _e=\sqrt{3}v _0$
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$ v _e=\sqrt{\dfrac{2}{3}}v _0$
The critical velocity or orbital velocity of a satellite of planet of radius $R$ is given by ,
Payload ratio is :
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$\dfrac{\text{fuel mass}}{\text{payload mass}}$
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$\dfrac{\text{payload mass}}{\text{fuel mass}}$
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$\dfrac{\text{payload mass}}{\text{total rocket mass}}$
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None of the above
Payload ratio is the ratio of mass that a payload carries and take-off weight. Take-off weight in case of short trips is almost equal to fuel mass.
Which of the following satellites have been successfully built by India ?
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Communication Satellites
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Meteorological Satellites
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Remote Sensing Satellites
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All of the above
All the given satellites have successfully built .
When the fuel in the rocket burns, the rocket moves vertically upward due to :
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the exhaust gases escape through the nozzle opposite to the earth and pushes downwards
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the exhaust gases escape through the nozzle opposite to the earth and pushes upwards
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the exhaust gases escape through the nozzle towards the earth and pushes downwards
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the exhaust gases escape through the nozzle towards the earth and pushes upwards
We know that by newton's third law of motion, Every action has an equal and opposite reaction. So as the fuel burns it escapes from the nozzle towards the earth. So the gases exert an equal and opposite force on the rocket. So this propels the rocket vertically upward.
Multistage rocket is used because:
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a single rocket cannot push satellite to a great height
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a single rocket cannot carry huge amount of fuel
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the speed of a single rocket is less
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none of the above
A multi-stage rocket consists of several pieces of fuel containers joined in series. Whenever any container's fuel starts burning, obviously the fuel quantity starts decreasing. When the container is completely empty, it is detached from the rocket and the second container starts working. This reduces the mass and weight of the rocket, enabling it to travel faster than before. After the 2nd gets empty, that is also detached and the third starts working, and so on. Thus there is rapid gain in speed continuously.
Streamlining of the rocket :
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minimizes the friction of air.
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maximizes the friction of air.
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Either A or B is correct depending on the weight of the rocket.
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Both A and B.
Whenever any object moves through air, air opposes the motion. This is known as air resistance.
Which of the following need to be considered when the rocket operates:
(A): As the rocket consumes fuel at every instant, its mass goes on decreasing.
(B): The acceleration due to gravity changes continuously as the rocket ascends.
(C): The atmosphere offers resistance in the lower strata of atmosphere.
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A, B and C
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Only B and C
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Only C
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None of the above
As the rocket consumes fuel at every instant, the fuel is converted to gases and are thrown out of the rocket. Hence the fuel content gets lesser and lesser as the fuel burns. Thus the mass goes on decreasing.
Fill in the blank.
Larger the mass of the rocket _____ is the acceleration.
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lesser
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larger
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same
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may be lesser or may be larger
Force $= mass\times acceleration$