Question

Calculate the buoyant force on a 2.00-L helium balloon. (b) Given the mass of the rubber in the balloon is 1.50 g, what is the net vertical force on the balloon if it is let go

Answer 1

Answer:

Following are the solution to the given points:

Explanation:

In this question, some of the values are missing, that's why its solution can be defined as follows:

In point a:

Density of air $\rho_{air} =1.29 \frac{kg}{m^3}$  

Density of helium $\rho_{helium} =0.178 \frac{kg}{m^3}$

The volume of the helium balloon $V= 2L$

$\to V= 2 \times 10^{-3}$

Formula:

$F_B = e_a V g$

$= 1.29 \times 2 \times 10^{-3} \times 9.81\\\\ = 0.0253098 \ N$

where g is the acceleration due to gravity

In point b:

$m_g= 1.5 \ g$

Formula:

$F_{net}=F_B - (m_r + \rho_h \ v )g$

       $= 0.0253098 - (1.5 \times 10^{-3} + 0.178 \times 2 \times 10^{-3} \times 9.81)\\\\= 7.10244 \times 10^{-3} \ N$