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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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