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Sahay Sir > Question Answers > JEE Mains Physics 2002-2019 Solved Video Solutions > Chapter 6 - Gravitation > Four identical particles of mass M are located at the corners of a square of side a . What should be their speed if each of them revolves under the influence of other’s gravitational field in a circular orbit circumscribing the square?

Four identical particles of mass M are located at the corners of a square of side a . What should be their speed if each of them revolves under the influence of other’s gravitational field in a circular orbit circumscribing the square?

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