ï»¿ A weightless rubber balloon has 100 gm of liquid of density 2 gm/cc and is suspended by a string. What will be the tension in the string when balloon is fully immersed in water?                       from Physics Mechanical Properties of Fluids Class 11 Manipur Board

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A weightless rubber balloon has 100 gm of liquid of density 2 gm/cc and is suspended by a string. What will be the tension in the string when balloon is fully immersed in water?

Mass  of liquid  =  100 gm
Density of liquid = 2 gm/cc

Volume of ballon containing liquid = 50cc

When it is fully immeresed in water, it will displace 50cc of water.

Therefore upward thrust on ballon is given by,

U = 50 x 1
= 50 gmf

Tension in string is,

T=100 - 50
= 50 gmf

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