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**Standing Wave/ Resonanace problem PLEASE HELP!**

Ok. I've tried to answer this problem so many times now, but I just can't get it. Here it is:

A child's toy called a twirler, consists of a tube (like a hose, which is spun

in a circle above one's head. It is noted that at certain rates of rotation,

sounds of definite pitch are heard. What is the source of the sound? what are

the resonance effects? What is the relationship between pitch and rate of

rotation...?

Thank You in advance