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Sahay Sir > Question Answers > JEE Mains Physics 2002-2019 Solved Video Solutions > Chapter 6 - Gravitation > 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, what should be the minimum energy that the launcher should have if the same rocket is to be launched from the surface of the moon ? Assume that the density of the earth and the moon are equal and that the earth’s volume is 64 times the volume of the moon :

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, what should be the minimum energy that the launcher should have if the same rocket is to be launched from the surface of the moon ? Assume that the density of the earth and the moon are equal and that the earth’s volume is 64 times the volume of the moon :

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