Buoyancy force

An adult male has a volume of about 0.070 m³. How much buoyancy does it affect him when he is completely immersed in water?

Correct answer:

F =  686.7 N

Step-by-step explanation:

$$\begin{gathered} V=0.07{\text{m}}^3 \\ g=9.81{\text{m/s}}^2 \\ \rho =1000{\text{kg/m}}^3 \\ m=\rho \cdot V=1000\cdot 0.07=70\text{ kg } \\ F=m\cdot g=70\cdot 9.81={\displaystyle \frac{6867}{10}}={\displaystyle \frac{6867}{10}}\text{ N}=686.7\text{ N} \end{gathered}$$

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