Attractive nuisances can create liability risks. Learn what a home attractive nuisance is and see the most common attractive nuisance examples.
In mathematics, the harmonic mean (sometimes called the subcontrary mean) is one of several kinds of average, and in particular one of the Pythagorean means. Typically, it is appropriate for situations when the average of rates is desired. The harmonic mean can be expressed as the reciprocal of the arithmetic mean of the reciprocals. As a simple example, the harmonic mean of 1, 2, and 4 is 3 1 1 + 1 2 + 1 4 = 1 1 3 ( 1 1 + 1 2 + 1 4 ) = 12 7 .
The fundamental is the lowest frequency; the harmonics are all multiples of that frequency. For example, if you play a concert A (440Hz) on a trumpet, the harmonics of that to â¦ ne would be at 880, 1320, 1760, 2200, 2640, 3080, 3520, 3960, 4400Hz, and so on.or a waveform containing harmonics, the harmonic frequencies are  multiples of what is known as the 'fundamental' frequency.