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PhysicsGravitationKepler's LawMedium2 minPYQ_2021

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Suppose the law of gravitational attraction suddenly changes and becomes an inverse cube law i.e. F $\propto \frac{1}{r ^{3}}$ , but still remaining a central force. Then

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Solution:

According to kepler's law of area $\frac{dA}{dt} = \frac{L}{2 m}$ For central forces, torque $= 0$ $∴ L =$ constant $∴ \frac{dA}{dt} =$ constant

Stream:BITSATSubject:PhysicsTopic:GravitationSubtopic:Kepler's Law

⏱ 2mℹ️ Source: PYQ_2021

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