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A travelling harmonic wave on a string i...

A travelling harmonic wave on a string is described by
`y(x,t)=7.5 sin(0.0050x+12t+pi//4)`
(a)what are the displacement and velocity of oscillation of a point at
`x=1cm,and t=1 s? ` Is this velocity equal to the velocity of wave propagation?
(b)Locate the points of the string which have the same transverse displacements and velocity as the x = 1 cm point at t = 2 s, 5 s and 11 s.

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A travelling harmonic wave on a string is described by , y=7.5 sin (0.0050x+12t+pi//4) What are the displacement and velocity of oscillation of a point at x=1 cm and t=1 s ? Is this velocity equal to the velocity of wave propagation?