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Wen

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**A 2 dimentional water wave spread in circular wave front.Show the amplitude A at a distance r from the initial diturbance is sq. rt. r.**

i know that U is equal to 1/2 (mass/unit length)w^2A^2lumtha. How do i link the distance r to the eqn?

**A horizontal string can transit a max of power, P with amplitude A and ang. frequency w.If the string is folded and used as a double string, tensoin is constant, what is the max. power?**

So tension is doubled hence final Velocity is the square root of the initial velocity. However, i am not sure if angular freguency and amplitude will change.

Please help with these 2 problems.