In a harmonic minor scale, the 7th note is up one semitone ascending and descending. In a melodic minor scale, the 6th and 7th note is up one semitone ascending, and back to the natural minor scale descending.
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Intervals and units of measurement
In most charts you must always label the axes.
They must be similar, with scale factor = 1.
Total downward force = 300 + 250 + 300 = 850N Total reaction (upward) force must be 850N = scale left (400N) + scale right. So scale right must be 450N.
No, there cannot be a zero in any scale factor.