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Orbital Velocity

A satellite o...

Question

A satellite orbiting round the earth appears stationary when:

A

Its time period is one day and it is rotating in the same sense as that of earth.

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B

Its time period is one day and it is rotating normal to the direction of earth.

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C

Its time period is

12 h r

and it is rotating in the same direction as that of earth.

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D

Its time period is

12 h r

and it is rotating normal to earth.

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Solution

The correct option is A Its time period is one day and it is rotating in the same sense as that of earth.
a satellite orbit revolving around the earth has same time period as that of the earth that is 1 day and it rotates in the same direction as that of the earth
so the relative velocity of the satellite with respect to earth is zero
so it appears to be stationary to earth

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