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October 23, 2014

October 23, 2014

Posted by **Phillip** on Tuesday, December 16, 2008 at 12:15am.

- Physics - Buoyant Force -
**Damon**, Tuesday, December 16, 2008 at 3:25amfind volume of metal first

Buoyant force in water = 14 N = weight of water displaced in 1 g gravitational field

mass of water displaced = 14 N/9.8 m/s^2 = 1.43 kg of water displaced

the density of water = 1,000 kg/m^3

so

volume of metal = 1.43*10^-3 m^3

Buoyant force in unknown = 50 - 41 = 9 N

so mass of unknown displace = 9/9.8 = .918 kg

so the density of unknown = .918kg/1.43*10^-3 = 642 kg/m^3

or 64.2% of the water density

- Physics - Buoyant Force -
**Phillip**, Tuesday, December 16, 2008 at 8:59amI'm confused about the "1 g gravitational field". What's the 1 g referring to and why is it 1 g?

- Physics - Buoyant Force -
**Damon**, Tuesday, December 16, 2008 at 10:43amg is the acceleration of gravity which is about 9.8 m/s^2 on the surface of earth.

Since the weights were given in Newtons, a unit of force, not mass, I used weight in Newtons = mass in kilograms * acceleration in meters / second squared to find the mass in kilograms.

- Physics - Buoyant Force -
**kriz**, Wednesday, September 30, 2009 at 12:50pmwhere did you got the buoyant force in water?

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