The equation of a wave is given by \( y=10 \sin \left(\frac{2 \pi}{45} t+\alpha\right) \). If th...

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The equation of a wave is given by \( y=10 \sin \left(\frac{2 \pi}{45} t+\alpha\right) \). If the displacement is \( 5 \mathrm{~cm} \) at \( t=0 \), then the total phase at \( t=7.5 \mathrm{~s} \) is
(a) \( \pi \)
(b) \( \pi / 6 \)
(c) \( \pi / 2 \)
(d) \( \pi / 3 \)
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