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Mechanical Properties of Fluids
Question
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In the displacement equation y = r sin(ωt/ + ϕ) what does ϕ called and what information does it give?

Answer

In equation y = r sin(ωt + ϕ),
ϕ is the initial phase of particle and is known as epoch.
It tells us about the position of particle at time, t = 0.

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