Physics - Fluid Question with Solution | TestHub

A needle is $7\mathrm{cm}$ long. Assuming that the needle is not wetted by water, what is the weight of the needle, so that floats on water? $$\left[\mathrm{T}=\text{ surface tension of water }=70\frac{\mathrm{dyne}}{\mathrm{cm}}\right]$$ [acceleration due to gravity $=980\mathrm{cm}{\mathrm{s}}^{-2}$ ]