1. T = m g = 4 kg . 10 m/s² = 40 N
u = 0,008 kg / 5 m = 0,0016 kg/m
V = √(T/u) = √(40 N / 0,0016 kg/m) = 158 m/s
2. T = 80 N; u = 0,030 kg / 2 m = 0,015 kg/m
V = √(80 N / 0,015 kg/m) = 73 m/s
Saludos.
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Verified answer
1. T = m g = 4 kg . 10 m/s² = 40 N
u = 0,008 kg / 5 m = 0,0016 kg/m
V = √(T/u) = √(40 N / 0,0016 kg/m) = 158 m/s
n = 1; f = 158 m / (2 . 5 m) = 15,8 Hz
2. T = 80 N; u = 0,030 kg / 2 m = 0,015 kg/m
V = √(80 N / 0,015 kg/m) = 73 m/s
n = 1; f = 73 m/s / (2 . 2 m) = 18,25 Hz
n = 2; f = 2 . 73 m/s / (2 . 2 m) = 36,5 Hz
Saludos.