A hollow plastic cube of mass and edge length is pushed down until it is just fully…

PHYSICS · Single correct · GCSE · Physics · Forces · Forces

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}

(b)

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

(c)

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

(d)

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