Two harmonic waves are represented in SI units by \[ y_{1}(x, t)=0.2 \sin (x-3.0 t) \text { and ...

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Two harmonic waves are represented in SI units by
\[
y_{1}(x, t)=0.2 \sin (x-3.0 t) \text { and } y_{2}(x, t)=0.2 \sin (x-3.0 t+\phi)
\]
(a) Write the expression for the sum \( y=y_{1}+y_{2} \) for \( \phi=\frac{\pi}{2} \) rad.
3) Suppose the phase difference \( \phi \) between the waves is unknown and the amplitude of their sum is \( 0.32 \mathrm{~m} \), what is \( \phi \) ?
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