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Q.

How long after the beginning of motion is the displacement of a harmonically oscillating point equal to one half of its amplitude, if the period is 24 sec and initial phase is zero?

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a

12 sec

b

4 sec

c

2 sec

d

6 sec

answer is B.

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Detailed Solution

y=A sin 2πTt When y=A2 then sin 2πTt=π6                                                  t=T12=2412=2s

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