Same chapter3 marksDifficulty: Medium
At what height above the earth's surface does the acceleration due to gravity fall to one-fourth of its surface value? Take R = 6,400 km.
Gravitation
3 marksDifficulty: Medium
What is a geostationary satellite? State two conditions it must satisfy.
Original Khojo Papers practice question — not from a past board paper.
Answer
A geostationary satellite appears fixed above one point on the earth's surface. Its period of revolution must be 24 hours, and it must move in the plane of the equator from west to east, which puts it at a height of about 36,000 km.
No citable source has been recorded for this record. Treat it as practice material, not as fact.
Explanation
Such satellites are used for communication and weather observation.
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