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F = mv²/r
F=Q
m*g = mv²/r /:m
g = v²/r
r = v²/g; v = 2πr/T = 2πrf
r = 4π²r²f²/g /:r
1 = 4π²rf²/g
4π²rf² = g
f² = g/4π²r
f = 2π*sqrt(g/r)
f = 2 * 3,14 * sqrt(10/2) = 6,28 * sqrt(5) = 6,28 * 2,24 = ok. 14 Hz