Balloon buoyancy force

The balloon filled with hot air has a volume of 1440 m³. How large a buoyancy force acted on the balloon in the air with a density of 1.3 kg/m³?

Final Answer:

F =  18364.32 N

Step-by-step explanation:

$$\begin{gathered} V=1440{\text{m}}^3 \\ \rho =1.3{\text{kg/m}}^3 \\ m=\rho \cdot V=1.3\cdot 1440=1872\text{kg} \\ g=9.81{\text{m/s}}^2 \\ F=m\cdot g=1872\cdot 9.81=18364.32\text{N} \end{gathered}$$

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