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## Homework Statement

A certain man has a mass of 85.0 kg and a density of 995 kg/m3 (exclusive of the air in his lungs).

(a) Calculate his volume.

.0854 m3

(b) Find the buoyant force air exerts on him.

N

(c) What is the ratio of the buoyant force to his weight?

(buoyant force / weight)

## Homework Equations

F

_{b}=density (of substance) x Volume (of object) x g

density of air=1.2 kg/m

^{3}

## The Attempt at a Solution

**F**

=1.004N

and then for part c

1.004/ (9.8 x 85=833)=.00121

For some reason this is incorrect. Does anyone see why?

_{b}=(1.2 kg/m^{3}) x (9.8) (.0854)=1.004N

and then for part c

1.004/ (9.8 x 85=833)=.00121

For some reason this is incorrect. Does anyone see why?