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A wave is described by y(x,t) = 0.4 sin(3x - 27t), where
x is in meters, y is in centimeters and t is in seconds.
At time t = 0, the point at x = 0 has a vertical
displacement y = 0.0 cm. Find time (in seconds) when
its displacement equal to 0.4 cm.
none of these
0.384
0.070
1.152
0.175

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