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Sahay Sir > Question Answers > JEE Mains Physics 2002-2019 Solved Video Solutions > Chapter 6 - Gravitation > A test particle is moving in a circular orbit in the gravitational field produced by a mass density ρ(r)= r/2K . Identify the correct relation between the radius R of the particle’s orbit and its period T.

A test particle is moving in a circular orbit in the gravitational field produced by a mass density ρ(r)= r/2K . Identify the correct relation between the radius R of the particle’s orbit and its period T.

A rocket has to be launched from earth in such a way that it never returns. If E is the minimum energy delivered by the rocket launcher A source of sound is approaching an observer with speed of 30ms and the observer is approaching the source with a speed 60 ms". Then the fractional change in the frequency of sound in air (330ms) is