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
State Kepler's three laws of planetary motion.
Original Khojo Papers practice question — not from a past board paper.
Answer
Every planet moves in an ellipse with the sun at one focus. The line joining a planet to the sun sweeps out equal areas in equal times. The square of the period of revolution is proportional to the cube of the semi-major axis of the orbit.
No citable source has been recorded for this record. Treat it as practice material, not as fact.
Explanation
The second law is a statement of the conservation of angular momentum.
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