Physics

Problem

A hollow plastic cube of mass

8\,\text{kg}

and edge length

40\,\text{cm}

is pushed down until it is just fully immersed in water and then held stationary by a light string attached to the bottom of the tank. If

g = 10\,\text{m s}^{-2}

, what is the tension in the string while the cube is held at rest? a)

8.0\times10^{1}\,\text{N}

5.6\times10^{2}\,\text{N}

6.4\times10^{2}\,\text{N}

4.8\times10^{2}\,\text{N}