What is the buoyant force exerted on the balloon in air

1. Jun 23, 2005

Eng67

Is this a correct interpretation of Archimedes Principle for this application?

A balloon is filled with helium (density = .02 kg/m^3) and has a volume of .009 m^3. What is the buoyant force exerted on the balloon in air
(density = 1.3 km/m^3)?

Fb = (1.3 km/m^3)x (.009 m^3) x (9.80 m)

= .115 N

Thanks

2. Jun 23, 2005

Staff: Mentor

Yes. Archimedes' Principle says that the buoyant force on an object equals the weight of the displaced fluid.

3. Jun 23, 2005

SGT

Nitpick! Mass is measured in kg, not km. The latter is a measure of distance.

4. Jun 23, 2005

gunblaze

Ya.. Eng67, u'r units are all wrong
Unit for density: $$kg/m^3$$
Unit for gravity: $$m/s^2$$

5. Jun 24, 2005

Eng67

Thanks for the help Guys. I just typed in Km instead of Kg.