Rita Skeeter goes boom

Classical Mechanics Level 2

One of the characters in the Harry Potter stories has the ability to turn herself into a beetle. So, let's pretend that all the other laws of physics hold, in particular conservation of momentum, and ask what would happen during such a transformation.

Consider a \(70~\mbox{kg}\) woman walking to the right at a speed of \(1~\mbox{m/s}\) who all of a sudden transforms into a \(10~\mbox{g}\) beetle. How many times faster than the speed of sound is she going after her transformation?

Details and assumptions

  • The speed of sound is approximately \(340~\mbox{m/s}\) at sea level.

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