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Show that even as well as odd harmonics ...

Show that even as well as odd harmonics are present as overtones in the case of an air column vibrating in a pipe open at both the ends.
A wheel of momen of intertia 1 kg `m^(2)` is rotating at a speed of 30 rad/s Due to friction on the axis, it comes to rest i n 10 mintes. Calculate the average torque of the friction.

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