As shown in the figure, a block of mass $9 \mathrm{~kg}$ is hung by a wire of area of cross-section of 1…
As shown in the figure, a block of mass $9 \mathrm{~kg}$ is hung by a wire of area of cross-section of 1 $\mathrm{mm}^2$ in a lift going up with an acceleration of $2 \mathrm{~ms}^{-2}$. If the speed of the transverse wave on the wire is $120 \mathrm{~ms}^{-1}$, the density of the material of the wire is
(Acceleration due to gravity $=10 \mathrm{~ms}^{-2}$)
