A block $2\mathrm{.}5$ cm by $2\mathrm{.}5$ cm by $2\mathrm{.}5$ cm cube of iron $(=7\mathrm{.}88\frac{g}{c}{m}^3)$ is weighed with the iron outside, half in and fully in the water, as shown in the diagram.

A$)$ Find mass of the block?

B$)$ Find the tension in the rope in case A$?$

If block is fully in the water and increase volume of water $40$ ml $,$ as shown in the Figure B

C$)$ Find buoyancy force in case B$?$

D$)$ Find the tension in the rope in e case B$?$