A string wave equation is given by \( y=0.002 \cos (300 t-15 x) \) and mass density is \( \mu=0....

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A string wave equation is given by
\( y=0.002 \cos (300 t-15 x) \) and mass density is
\( \mu=0.1 \mathrm{~kg} / \mathrm{m} \). Then find the tension force in the string.
(a) \( 30 \mathrm{~N} \)
(b) \( 20 \mathrm{~N} \)
(c) \( 40 \mathrm{~N} \)
(d) \( 45 \mathrm{~N} \)
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