The vibrations of a string of length $60\text{ cm}$ fixed at both ends are represented by the equation $y =…

The vibrations of a string of length $60\text{ cm}$ fixed at both ends are represented by the equation $y = 4 \sin \left(\frac{\pi x}{15}\right) \cos (96\pi t)$, where $x$ and $y$ are in cm and $t$ in second. The maximum displacement at $x = 5\text{ cm}$ is
  1. $2\sqrt{3}$ cm
  2. $3\sqrt{2}$ cm
  3. $\sqrt{2}$ cm
  4. $\sqrt{3}$ cm

Solution

$A_x = 4 \sin \left( \frac{\pi x}{15} \right)$ At $x = 5\text{ cm}$, $A_x = 4 \sin \frac{\pi}{3} = 2\sqrt{3}\text{ cm}$

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