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Q.

$Y = A \sin (ω t + ϕ_{0})$ is the time –displacement equation of a SHM. At t=0 the displacement of the particle is $Y = \frac{A}{2}$ and it is moving along negative x-direction. Then the initial phase angle $ϕ_{0}$ will be:

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a

$\frac{π}{3}$

b

$\frac{π}{6}$

c

$\frac{5 π}{6}$

d

$\frac{2 π}{3}$

answer is D.

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Detailed Solution

$y = A \sin (ω t + ϕ_{o}), a t t = 0 : y = - A / 2, - \frac{A}{2} = A \sin ϕ_{o}, ϕ_{o} = 5 \frac{π}{6}$

$v e l o c i t y i s p o s i t i v e f o r ϕ_{o} = \frac{π}{6} v e l o c i t y i s n e g a i t i v e f o r ϕ_{o} = \frac{5 π}{6}$

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