Question

A metal cube of 5cm edge and relative density 1.2, such that it is completely imme tension in thread.​

Answer 1

Answer:

Side of the cube =5 cm

So, its volume , V=a3=125 cm3

Mass of cube =V×d=125×9=1125 g

Weight =mg=1125×1000=1125000 dyne

Now, cube is immersed is liquid, 

∴ buoynat force =Vρg=125×1.2×1000=150000 dyne

So, Tension = apparent weight =(1125000−150000) dyne=975000 dyne=9.75 N

Answer 2

Answer:

therefore the answer is 9.75

Explanation:

Side of the cube =5 cm

So, its volume , V=a

3

=125 cm

3

Mass of cube =V×d=125×9=1125 g

Weight =mg=1125×1000=1125000 dyne

Now, cube is immersed is liquid,

∴ buoynat force =Vρg=125×1.2×1000=150000 dyne

So, Tension = apparent weight =(1125000−150000) dyne=975000 dyne=9.75 N