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A small mass m is tied to a string and swung in a horizontal plane. The...

A small mass m is tied to a string and swung in a horizontal plane. The string winds around a vertical rod as the mass revolves, like a length of jewelry chain wrapping around an outstretched finger. Given that the initial speed and length are vi and ri, calculate vf when ri/rf = 8.20 and vi = 0.24 m/s.

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Answer #1

Ans:

Explanation:

Mass of the object = m

Initial speed of the mass is

Let the final speed is

As the mass revolves in horizontal plane ,

The angular momentum is L = mvr

So, initial angular momentum ( ) =. Final angular momentum ()

Given ,

So,

So final speed

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