Equation $y=0\mathrm{.}001sin(x+20t),x$ and $y$ are in meter and $t$ in seconds describes a wave

propagated along a rope. If the linear density of the vibrating rope is $1\mathrm{.}0{10}^{-3}k\frac{g}{m},$ what is

the tension in the rope? $($Ans$.0\mathrm{.}4N)$

An object in vertical simple harmonic motion is described by $y=(0\mathrm{.}30cm)sin1\mathrm{.}5t.$ What

is the speed of the object at $t=5s?($Ans$.1\mathrm{.}4c\frac{m}{s})$

A steel rod of length $2000m$ is under the ocean water. A sound is produced at one end of the

rods and travels through both the rod and the water. Calculate the time delay between the