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T = 2 s
m = 0,1 kg
F = m*v²/r
v=2πr/T
F = [m*(2πr/T)²]/r = [(0,1 kg * (2s* 3,14 *0,2m)/2s)²]/0,2m =
= 0,197 N = 0,2 N
N=mV²/R
V-prędkość
V=2πR/T
Podstawiając otrzymujemy
N=m(2πR/T)²/R
N=m*4*π²R/T²=0,2N