[tex]Dane:\\\alpha = 45^{o}\\sin\alpha = sin45^{o}=707\\\beta = 30^{o}\\sin\beta =sin30^{o} = 0,5\\v_{p} = 340\frac{m}{s}\\Szukane:\\v_{w} = ?[/tex]
Rozwiązanie
Z prawa załamania:
[tex]\frac{sin\alpha}{sin\beta} = \frac{v_{p}}{v_{w}} \ \ \rightarrow \ v_{w} = \frac{sin\beta}{sin\alpha}\cdot v_{p}\\\\v_{w} = \frac{0,5}{0,707}\cdot340\frac{m}{s} = 0,707\cdot340\frac{m}{s}\\\\\boxed{v_{w}\approx240\frac{m}{s}}[/tex]
