Physics - Gravitation Question with Solution | TestHub
PhysicsGravitationKepler's LawMedium2 minQB
PhysicsMediummultiple choice
A planet is orbiting a star when for no apparent reason the star's gravity suddenly vanishes. After which planet moves in a straight line. Mark the CORRECT statement(s) :
Options:(select one or more)
Answer:
A, C, D
Solution:
After gravity vanishes no force acts on the planet, so it moves uniformly in a straight line - Newton's first law is obeyed, (A) correct.
The force on the planet was always central (through the star), so its angular momentum about the star is conserved throughout the motion - (D) correct.
Conserved angular momentum means equal areas are swept in equal times even after gravity vanishes, so Kepler's area law still holds - (C) correct, (B) wrong.
Stream:JEESubject:PhysicsTopic:GravitationSubtopic:Kepler's Law
⏱ 2mℹ️ Source: QB
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