Question

You measure salt water in a tank to have a density of 1.02 g/mL. A balloon weighs 2.0 g and you weights have a mass of 30.0 g each. If you put 6 weights in your balloon, you must inflate your balloon to what diameter for it to have a density equal to the salt water, and therefor float in the middle of the tank?

Answer 1

Weight of the balloon = 2.0 g

Six weights each of mass 30.0 g is added to the balloon.

Total mass of the balloon = 2.0 g + 6*30.0 g = 182 g

Density of salt water = 1.02 g/mL

Calculating the volume from mass and density:

`182g*(mL)/(1.02g) =178mL`

Converting the volume from mL to cubic cm:

`178 mL * (1cm^(3) )/(1mL) =178cm^(3)`

Assuming the balloon to be a sphere,

Volume of the sphere =
`(4)/(3)`π
`r^(3)`

`178 cm^(3) = (4)/(3)((22)/(7))r^(3)`

r = 3.49 cm

Radius of the balloon = 3.49 cm

Diameter of the balloon = 2 r = 2*3.49 cm = 6.98cm