1.

The amplitude and the periodic time of a S.H.M. are 5 cm and 6 sec respectively. At a distance of 2.5 cm away from the mean position, the phase will beA. `(pi)/(3)`B. `(pi)/(4)`C. `(pi)/(6)`D. `(5pi)/(12)`

Answer» Correct Answer - C
(c) The equation of motion is given as
`y=5"sin"(2pit)/(6)`
Here, `y=2.5 cm`
`therefore 2.5=5 "sin"(2pit)/(6)`
`implies(pi)/(6)=(2pit)/(6)`
`implies t=(1)/(2)s`
`therefore` The phase `=(2pit)/(6)=(2pi)/(6)xx(1)/(2)=(pi)/(6)`


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