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m = 400 g = 0,4 kg
R = 20 cm = 0,2 m
t = 1,5 s
n = 1
szukane:
v = ?
Fr = ?
v = 2TTR/T
T = t/n = 1,5s/1 = 1,5 s
v = 2 * 3,14 * 0,2m/1,5s
v = 0,84 m/s
Fr = mv^2/R
Fr = 0,4kg *(0,84m/s)^2/0,2m
Fr = 1,4 N