Question

Consider a helium balloon with volume 2.1 L.

Answer 1

Answer:

The net force is 26.52 N

Explanation:

Given that,

Volume of balloon = 2.1 L

Density of air  = 1.29 kg/m³

Mass = 1.3 g

Density of helium $\rho'= 0.18\times10^{-3}\ g/cm^3$

(a). We need to calculate the buoyant force on the balloon

Using formula of buoyant force

$F_{b}=\rho V g$

Put the value into the formula

$F_{b}=1.29\times\times2.1\times9.8$

$F_{b}=26.54\ N$

(b). We need to calculate the net force

Using formula of net force

$F_{net}=F_{b}-(V\times\rho'+m)\times g$

$F_{net}=26.54-(2.1\times10^{-3}\times0.18\times10^{-3}+0.0013)\times9.8$

$F_{net}=26.52\ N$

Hence, The net force is 26.52 N.