Question

A tank of height \(5\,m\) is completely filled with water and a cube of side \(1\,cm\) and density \(1.5\,g\,cm^{-3}\) is placed at the bottom of the tank. The work to be done to lift the cube at the bottom to a height of \(15\,m\) above the surface of water is:

• A. \(25\,mJ\)
• B. \(300\,mJ\)
• C. \(250\,mJ\)
• D. \(225\,mJ\)

Hint:

Inside a liquid, use effective weight: \[ W_{eff}=mg-\rho Vg. \] Above the liquid, buoyancy disappears and only \(mg\) acts.

Answer 1

The Correct Option is D