b
(b)

\(y=2 \sin (10 x+300 t)\)

\(y=A \sin (k x+\omega t)\)

\(k=10, \quad \omega=300\)

\(\mu=0.6 \times 10^{-3}\,g / cm\)

\(\mu=\frac{0.6 \times 10^{-3} \times 10^{-3}}{10^{-2}}\,kg / m\)

\(\mu=6 \times 10^{-5}\,kg / m\)

\(K=\frac{\omega}{V}\)

\(V=\frac{\omega}{K}=\frac{30 p}{T p}=30\,m / s\)

\(V=\sqrt{\frac{T}{M}}\)

\(T=V^2 \times M\)

\(T=(30)^2 \times 6 \times 10^{-5}\)

\(=900 \times 6 \times 10^5\)

\(=5400 \times 10^{-5}\)

\(=0.0541\,N\)